阅读说明：本技术 一类含氟化合物及其应用 (Fluorine-containing compound and application thereof ) 是由 张新刚 张庶 张健 于 2021-06-11 设计创作，主要内容包括：本发明公开了一类含氟化合物及其应用。本发明提供了一类如式I所示的含氟化合物作为电池电解液添加剂的应用。该类化合物减少了锂离子电池的不可逆容量损失,在控制商业成本的基础上显著提高了锂离子电池的放电容量、工作电压、循环寿命和循环稳定性,能在商业化发展中迅速应用,有效控制了商业成本。(The invention discloses a fluorine-containing compound and application thereof. The invention provides application of a fluorine-containing compound shown as a formula I as a battery electrolyte additive. The compound reduces the irreversible capacity loss of the lithium ion battery, obviously improves the discharge capacity, the working voltage, the cycle life and the cycle stability of the lithium ion battery on the basis of controlling the commercial cost, can be quickly applied in the commercial development, and effectively controls the commercial cost.)

1. The application of fluorine-containing compounds shown as a formula I as a battery electrolyte additive;

wherein R is¹、R²、R³、R⁴And R⁵Independently H, F, Cl, Br, I, "C₁-C₂₀Straight or branched alkyl of (2), (halogen-substituted C)₁-C₂₀Straight or branched alkyl of (2), "heteroatom-containing C₁-C₂₀The heteroatom is one or more of S, O, N, Si, P and B, and the "halogen-substituted heteroatom-containing C₁-C₂₀The heteroatom is one or more of S, O, N, Si, P and B, and the heteroatom is C₆-C₂₀Aryl of (2), "halogen-substituted C₆-C₂₀Aryl of (2), "" C₄-C₂₀Wherein the heteroatom is one or more of S, O, N, Si, P and B or "halogen-substituted C₄-C₂₀Wherein the hetero atom is one or more of S, O, N, Si, P and BSeed ";

and R is¹、R²、R³、R⁴And R⁵At least one of which is F;

x is nothing and C₁-C₂₀Straight or branched alkylene of (2), (halogen-substituted C)₁-C₂₀Straight or branched alkylene of (2), "" heteroatom-containing C₁-C₂₀The heteroatom is one or more of S, O, N, Si, P and B, or the' halogen substituted heteroatom-containing C₁-C₂₀Linear or branched alkylene with heteroatoms of one or more of S, O, N, Si, P and B ";

R^Xis "C₆-C₂₀Aryl of (2), "" R "^X-1Substituted C₆-C₂₀Aryl of (2), "" C₄-C₂₀Wherein the heteroatom is one or more of S, O, N, Si, P and B or R^X-2Substituted C₄-C₂₀Wherein the heteroatom is one or more of S, O, N, Si, P and B ";

R^X-1and R^X-2Independently F, Cl, Br, I, "C₁-C₂₀Straight or branched alkyl of (2), (halogen-substituted C)₁-C₂₀Straight or branched alkyl of (2), "heteroatom-containing C₁-C₂₀The heteroatom is one or more of S, O, N, Si, P and B, or' halogen substituted, heteroatom-containing C₁-C₂₀The heteroatom is one or more of S, O, N, Si, P and B ".

2. The use of claim 1, wherein R is¹、R²、R³、R⁴And R⁵Is F;

and/or, X is nothing, "C₁-C₂₀Or "C containing hetero atoms₁-C₂₀The hetero atom is one or more of S, O, N, Si, P and BSeed ";

and/or, R^XIs "C₆-C₁₄Aryl of or^X-1Substituted C₆-C₁₄Aryl of (a);

and/or, R^X-1And R^X-2Independently is "C₁-C₂₀Straight or branched alkyl of (2), (halogen-substituted C)₁-C₂₀Straight or branched alkyl of (2), "heteroatom-containing C₁-C₂₀The heteroatom is one or more of S, O, N, Si, P and B, or' halogen substituted, heteroatom-containing C₁-C₂₀The heteroatom is one or more of S, O, N, Si, P and B ".

3. Use according to claim 2, wherein X is absent or "C₁-C₂₀Linear or branched alkylene groups of ";

and/or, R^XIs "C₆-C₁₀Aryl of or^X-1Substituted C₆-C₁₀Aryl of (a);

and/or, R^X-1Independently is "C₁-C₂₀Linear or branched alkoxy ", or" halogen-substituted C₁-C₂₀Linear or branched alkyl groups of ".

4. Use according to claim 3, wherein X is methylene;

and/or, R^XIs R^X-1Substituted phenyl or naphthyl;

and/or, R^X-1Independently is "C₁-C₄Linear or branched alkoxy ", or" halogen-substituted C₁-C₄Linear or branched alkyl groups of ".

5. Use according to claim 1, wherein the fluorochemical compound of formula I is defined as in any of the following schemes:

scheme 1:

R¹、R²、R³、R⁴and R⁵Is F;

x is nothing and C₁-C₂₀Or "C containing hetero atoms₁-C₂₀Linear or branched alkylene with heteroatoms of one or more of S, O, N, Si, P and B ";

R^Xis "C₆-C₂₀Aryl of (2), "" R "^X-1Substituted C₆-C₂₀Aryl of (2), "" C₄-C₂₀Wherein the heteroatom is one or more of S, O, N, Si, P and B or R^X-2Substituted C₄-C₂₀Wherein the heteroatom is one or more of S, O, N, Si, P and B ";

R^X-1and R^X-2Independently is "C₁-C₂₀Straight or branched alkyl of (2), (halogen-substituted C)₁-C₂₀Straight or branched alkyl of (2), "heteroatom-containing C₁-C₂₀The heteroatom is one or more of S, O, N, Si, P and B, or' halogen substituted, heteroatom-containing C₁-C₂₀The heteroatom is one or more of S, O, N, Si, P and B;

scheme 2:

the compound shown in the formula I is a compound shown in a formula D or a formula E:

formula D:

formula E:

wherein R is⁶、R⁷、R⁸、R⁹、R¹⁰、R¹¹、R¹³And R¹⁴Independently is H or R^X-1；

For example, the compound of formula D is a compound of formula a, formula B, or formula C:

formula A:

formula B:

formula C:

scheme 3:

R¹、R²、R³、R⁴and R⁵Is F;

x is nothing or' C₁-C₂₀Linear or branched alkylene groups of ";

R^Xis "C₆-C₁₄Aryl of or^X-1Substituted C₆-C₁₄Aryl of (a);

R^X-1independently is "C₁-C₂₀Linear or branched alkoxy ", or" halogen-substituted C₁-C₂₀Linear or branched alkyl groups of ";

and, scheme 4:

R¹、R²、R³、R⁴and R⁵Is F;

x is nothing or' C₁-C₄Linear or branched alkylene groups of ";

R^Xis "C₆-C₁₀Aryl of or^X-1Substituted C₆-C₁₀Aryl of (a);

R^X-1independently is "C₁-C₄Linear or branched alkoxy ", or" halogen-substituted C₁-C₄Linear or branched alkyl groups of ".

6. The method of any one of claims 1 to 5The use of (A) when R is¹、R²、R³、R⁴And R⁵Independently halogen substituted C₁-C₂₀When the alkyl group is a straight or branched alkyl group, said "C" is₁-C₂₀Is "C" or a linear or branched alkyl group of₁-C₄Linear or branched alkyl groups of ";

and/or when R¹、R²、R³、R⁴And R⁵Independently halogen substituted C₁-C₂₀When the alkyl group is a straight chain or branched chain alkyl group, the halogen is F, Cl, Br or I;

and/or when R¹、R²、R³、R⁴And R⁵Independently halogen substituted C₁-C₂₀In the case of the linear or branched alkyl group of (1), the number of said halogen is 1,2 or 3;

and/or when R¹、R²、R³、R⁴And R⁵Independently is "halogen-substituted, heteroatom-containing C₁-C₂₀When the heteroatom is one or more of S, O, N, Si, P and B, the 'C' is₁-C₂₀Is "C" or a linear or branched alkyl group of₁-C₄Linear or branched alkyl groups of ";

and/or when R¹、R²、R³、R⁴And R⁵Independently is "halogen-substituted, heteroatom-containing C₁-C₂₀When the heteroatom is one or more of S, O, N, Si, P and B', the halogen is F, Cl, Br or I;

and/or when R¹、R²、R³、R⁴And R⁵Independently is "halogen-substituted, heteroatom-containing C₁-C₂₀When the heteroatom is one or more of S, O, N, Si, P and B', the number of the halogen is 1,2 or 3;

and/or when R¹、R²、R³、R⁴And R⁵Independently of each otherIs "halogen-substituted, heteroatom-containing C₁-C₂₀When the heteroatom is one or more of S, O, N, Si, P and B', the number of the heteroatom is 1,2 or 3;

and/or when R¹、R²、R³、R⁴And R⁵Independently is "halogen-substituted, heteroatom-containing C₁-C₂₀When the heteroatom is one or more of S, O, N, Si, P and B ", the heteroatom is one or more of S, O and N;

and/or, when X is C₁-C₂₀When the alkylene group is a straight chain or branched chain alkylene group, the "C" is₁-C₂₀Is "C" or a branched or unbranched alkylene group₁-C₄Linear or branched alkylene groups of ";

and/or, when X is halogen-substituted C₁-C₂₀When the alkylene group is a straight chain or branched chain alkylene group, the "C" is₁-C₂₀Is "C" or a branched or unbranched alkylene group₁-C₄Linear or branched alkylene groups of ";

and/or, when X is halogen-substituted C₁-C₂₀When the alkylene group is a straight chain or branched chain alkylene group, the halogen is F, Cl, Br or I;

and/or, when X is halogen-substituted C₁-C₂₀In the case of the straight-chain or branched alkylene group of (1), the number of the halogen is 1,2 or 3;

and/or, when X is "heteroatom containing C₁-C₂₀When the hetero atom is one or more of S, O, N, Si, P and B, the "C" is₁-C₂₀Is "C" or a branched or unbranched alkylene group₁-C₄Linear or branched alkylene groups of ";

and/or, when X is "heteroatom containing C₁-C₂₀When the heteroatom is one or more of S, O, N, Si, P and B', the number of the heteroatoms is 1,2 or 3;

and/or, when X is "heteroatom containing C₁-C₂₀When the heteroatom is one or more of S, O, N, Si, P and B', the heteroatom is one or more of S, O and N;

and/or, when X is "halogen-substituted, heteroatom-containing C₁-C₂₀When the hetero atom is one or more of S, O, N, Si, P and B, the "C" is₁-C₂₀Is "C" or a branched or unbranched alkylene group₁-C₄Linear or branched alkylene groups of ";

and/or, when X is "halogen-substituted, heteroatom-containing C₁-C₂₀When the heteroatom is one or more of S, O, N, Si, P and B', the halogen is F, Cl, Br or I;

and/or, when X is "halogen-substituted, heteroatom-containing C₁-C₂₀When the heteroatom is one or more of S, O, N, Si, P and B', the number of the halogen is 1,2 or 3;

and/or, when X is "halogen-substituted, heteroatom-containing C₁-C₂₀When the heteroatom is one or more of S, O, N, Si, P and B', the number of the heteroatoms is 1,2 or 3;

and/or, when X is "halogen-substituted, heteroatom-containing C₁-C₂₀When the heteroatom is one or more of S, O, N, Si, P and B', the heteroatom is one or more of S, O and N;

and/or when R^XIs C₆-C₂₀Aryl of (2), said C₆-C₂₀Aryl of is C₆-C₁₄Aryl of (a);

and/or when R^XIs R^X-1Substituted C₆-C₂₀Aryl of (2), said C₆-C₂₀Aryl of is C₆-C₁₄Aryl of (a);

and/or when R^XIs R^X-1Substituted C₆-C₂₀When aryl of (A) is said R^X-1The number of (a) is 1,2 or 3;

and/or when R^XIs R^X-1Substituted C₆-C₂₀When aryl of (A) is said R^XIndependently from said X, each is ortho, meta or para;

and/or when R^X-1Independently is "heteroatom containing C₁-C₂₀When the heteroatom is one or more of S, O, N, Si, P and B, the 'heteroatom-containing C' is₁-C₂₀Is one or more of S, O, N, Si, P and B, and is' C₁-C₂₀Linear or branched alkoxy of ";

and/or when R^X-1Independently halogen substituted C₁-C₂₀When the alkyl group is a straight or branched alkyl group, said "C" is₁-C₂₀Is "C" or a linear or branched alkyl group of₁-C₄Linear or branched alkyl groups of ";

and/or when R^X-1Independently halogen substituted C₁-C₂₀When the alkyl group is a straight chain or branched chain alkyl group, the halogen is F, Cl, Br or I;

and/or when R^X-1Independently halogen substituted C₁-C₂₀In the case of the linear or branched alkyl group of (1), the number of said halogen is 1,2 or 3;

and/or when R^X-1Independently is "halogen-substituted, heteroatom-containing C₁-C₂₀When the heteroatom is one or more of S, O, N, Si, P and B, the 'C' is₁-C₂₀Is "C" or a linear or branched alkyl group of₁-C₄Linear or branched alkyl groups of ";

and/or when R^X-1Independently is "halogen-substituted, heteroatom-containing C₁-C₂₀When the heteroatom is one or more of S, O, N, Si, P and B', the halogen is F, Cl, Br or I;

and/or when R^X-1Independently is "halogen-substituted, heteroatom-containing C₁-C₂₀When the heteroatom is one or more of S, O, N, Si, P and B', the number of the halogen is 1,2 or 3;

and/or the halogen is F, Cl, Br or I.

7. The use as claimed in claim 6, wherein when R is¹、R²、R³、R⁴And R⁵Independently halogen substituted C₁-C₂₀When the alkyl group is a straight or branched alkyl group, said "C" is₁-C₂₀The straight or branched alkyl group of "is methyl, ethyl, n-propyl, isopropyl, n-butyl, sec-butyl, isobutyl or tert-butyl;

and/or when R¹、R²、R³、R⁴And R⁵Independently is "halogen-substituted, heteroatom-containing C₁-C₂₀When the heteroatom is one or more of S, O, N, Si, P and B, the 'C' is₁-C₂₀The straight or branched alkyl group of "is methyl, ethyl, n-propyl, isopropyl, n-butyl, sec-butyl, isobutyl or tert-butyl;

and/or, when X is C₁-C₂₀When the alkylene group is a straight chain or branched chain alkylene group, the "C" is₁-C₂₀The straight or branched alkylene group "of (a) is a methylene group or an ethylene group;

and/or, when X is halogen-substituted C₁-C₂₀When the alkylene group is a straight chain or branched chain alkylene group, the "C" is₁-C₂₀The straight or branched alkylene group "of (a) is a methylene group or an ethylene group;

and/or, when X is "heteroatom containing C₁-C₂₀When the hetero atom is one or more of S, O, N, Si, P and B, the "C" is₁-C₂₀The straight or branched alkylene group "of (a) is a methylene group or an ethylene group;

and/or, when X is "halogen-substituted, heteroatom-containing C₁-C₂₀When the hetero atom is one or more of S, O, N, Si, P and B, the "C" is₁-C₂₀The straight or branched alkylene group "of (a) is a methylene group or an ethylene group;

and/or when R^XIs C₆-C₂₀Aryl of (2), said C₆-C₂₀Aryl of is C₆-C₁₀Aryl of (a);

and/or when R^XIs R^X-1Substituted C₆-C₂₀Aryl of (2), said C₆-C₂₀Aryl of is C₆-C₁₀Aryl of (a);

and/or when R^XIs R^X-1Substituted C₆-C₂₀When aryl of (A) is said R^X-1The number of (2) is 1 or 2;

and/or when R^XIs R^X-1Substituted C₆-C₂₀When aryl of (A) is said R^XIndependently meta or para to said X;

and/or when R^X-1Independently is "heteroatom containing C₁-C₂₀When the heteroatom is one or more of S, O, N, Si, P and B, the 'heteroatom-containing C' is₁-C₂₀Is one or more of S, O, N, Si, P and B and is "methoxy, ethoxy, N-propoxy, isopropoxy, N-butoxy, sec-butoxy, isobutoxy or tert-butoxy;

and/or when R^X-1Independently halogen substituted C₁-C₂₀When the alkyl group is a straight or branched alkyl group, said "C" is₁-C₂₀The straight or branched alkyl group of "is methyl, ethyl, n-propyl, isopropyl, n-butyl, sec-butyl, isobutyl or tert-butyl;

and/or when R^X-1Independently is "halogen-substituted, heteroatom-containing C₁-C₂₀When the heteroatom is one or more of S, O, N, Si, P and B, the 'C' is₁-C₂₀Linear chain of (2)Or branched alkyl "is methyl, ethyl, n-propyl, isopropyl, n-butyl, sec-butyl, isobutyl or tert-butyl.

8. The use as claimed in claim 7, wherein when R is¹、R²、R³、R⁴And R⁵Independently halogen substituted C₁-C₂₀When the alkyl group is a straight or branched alkyl group, said halogen is substituted by C₁-C₂₀The linear or branched alkyl group of (a) is trifluoromethyl;

and/or, when X is C₁-C₂₀When the alkylene group is a straight chain or branched chain alkylene group, the "C" is₁-C₂₀The straight or branched chain alkylene group "of (a) is a methylene group;

and/or, when X is halogen-substituted C₁-C₂₀When the alkylene group is a straight chain or branched chain alkylene group, the "C" is₁-C₂₀The straight or branched chain alkylene group "of (a) is a methylene group;

and/or, when X is "heteroatom containing C₁-C₂₀When the hetero atom is one or more of S, O, N, Si, P and B, the "C" is₁-C₂₀The straight or branched chain alkylene group "of (a) is a methylene group;

and/or, when X is "halogen-substituted, heteroatom-containing C₁-C₂₀When the hetero atom is one or more of S, O, N, Si, P and B, the "C" is₁-C₂₀The straight or branched chain alkylene group "of (a) is a methylene group;

and/or when R^XIs C₆-C₂₀Aryl of (2), said C₆-C₂₀Aryl of (a) is phenyl, naphthalen-1-yl, or naphthalen-2-yl;

and/or when R^XIs R^X-1Substituted C₆-C₂₀Aryl of (2), said C₆-C₂₀Aryl of (a) is phenyl, naphthalen-1-yl, or naphthalen-2-yl;

and/or when R^XIs R^X-1Substituted C₆-C₂₀When aryl of (A) is said R^X-1The number of (A) is 1, C₆-C₂₀Aryl of (A) is phenyl, said R^XIs meta or para to the X; or, said R^X-1The number of (2), C₆-C₂₀Aryl of (A) is phenyl, said R^XIs meta to said X;

and/or when R^X-1Independently is "heteroatom containing C₁-C₂₀When the heteroatom is one or more of S, O, N, Si, P and B, the 'heteroatom-containing C' is₁-C₂₀Is one or more of S, O, N, Si, P and B, and is methoxy;

and/or when R^X-1Independently halogen substituted C₁-C₂₀When the alkyl group is a straight or branched alkyl group, said halogen is substituted by C₁-C₂₀The linear or branched alkyl group of (a) is a trifluoromethyl group.

9. The use according to claim 1, wherein the compound of formula I is any one of the following compounds:

10. the use of claim 1, wherein the battery is a lithium or zinc battery;

and/or the electrolyte comprises a solvent;

and/or the electrolyte comprises an electrolyte lithium salt;

and/or the mass percentage of the compound shown in the formula I in the electrolyte is 0.1-5%.

11. The use according to claim 10, wherein, when the battery is a lithium battery, the lithium battery is a lithium metal battery or a lithium ion battery;

and/or, when the electrolyte comprises a solvent, the solvent is water and/or an organic solvent; such as dimethyl carbonate, diethyl carbonate, ethylene carbonate, propylene carbonate, 2, 3-butanediol carbonate, 1, 2-pentanediol carbonate, 2-methyl-1, 2-butanediol carbonate, methyl ethylene carbonate, methyl ethyl carbonate, methyl propyl carbonate, methyl n-butyl carbonate, methyl isobutyl carbonate, 2-butyl methyl carbonate, methyl isopropyl carbonate, butylene carbonate, dibutyl carbonate, methyl butyl carbonate, fluoroethylene carbonate, 2,2, 2-trifluoroethyl methyl carbonate, 2,2, 2-trifluoroethyl ethyl carbonate, 2,2, 2-trifluoroethyl propyl carbonate, 2,2',2',2' -hexafluoroisopropyl methyl carbonate, 2, ethyl 2,2,2',2',2' -hexafluoroisopropyl carbonate, bis (2,2, 2-trifluoroethyl) carbonate, bis (2,2,3, 3-tetrafluoropropyl) carbonate, bis (2,2,3,3, 3-pentafluoropropyl) carbonate, 1,2, 2-tetrafluoroethyl-2, 2,3, 3-tetrafluoropropyl carbonate, 1,2,2, 2-pentafluoroethyl-2, 2,3,3, 3-pentafluoropropyl carbonate, 4- (2,2,3,3) -tetrafluoropropoxymethyl- [1,3] -dioxolan-2-one, 4- (2,3,3,3) -tetrafluoro-2-trifluoromethyl-propyl- [1,3] -dioxolan-2-one, Methyl formate, ethyl acetate, methyl propionate, ethyl propionate, methyl butyrate, ethyl butyrate, methyl acetate, cyclobutyrate, cypionate, azomethyloxazolidinone, methyl difluoroacetate, methyl trifluoroacetate, ethyl trifluoroacetate, 2,2, 2-trifluoro-N, N-dimethylacetamide, 1, -trifluoromethyl-N, N-dimethylformamide, dimethanol formal, ethylene glycol dimethyl ether, ethylene glycol diethyl ether, tetrahydrofuran, 2-methyltetrahydrofuran, 1, 3-dioxolane, 2-methyl-1, 3-dioxolane, 4-methyl-1, 3-dioxolane, 1,2, 2-tetrafluoroethyl-2, 2, 2-trifluoroethyl ether, 1,2, 2-tetrafluoroethyl-2, one or more of 2,3, 3-tetrafluoropropyl ether, methyl nonafluorobutyl ether, acetonitrile, 3-methoxypropionitrile, 3-ethoxypropionitrile, 3- (2,2, 2-trifluoroethoxy) propionitrile, malononitrile, succinonitrile, glutaronitrile, adiponitrile, pimelonitrile, suberonitrile, nonanonitrile, sebaconitrile, dimethyl methylphosphonate, dimethyl (2-methoxyethoxy) methylphosphonate, diethyl (2-methoxyethoxy) methylphosphonate, methylethylsulfone, sulfolane, dibutylsulfone, ethylvinylsulfone, methylisopropylsulfone, ethylisopropylsulfone, ethylisobutylsulfone, isopropylisobutylsulfone, 2-butylisopropylisopropylsulfone, n-butylisobutylsulfone, and 2-methoxyethylmethylsulfone;

and/or, when the electrolyte comprises an electrolyte lithium salt, the electrolyte lithium salt is LiPF₆、LiBF₄、LiClO₄、LiAsF₆、LiCF₃SO₃、LiB(CO₂CO₂)₂、LiBF₂(CO₂CO₂)、LiCl、LiN(SO₂CF₂CF₃)₂、LiN(SO₂CF₃)₂And LiN (SO)₂F)₂One or more of;

and/or, when the electrolyte comprises electrolyte lithium salt, the molar concentration of the electrolyte lithium salt in the electrolyte is 1 mol/L;

and/or the mass percent of the compound shown in the formula I in the electrolyte is 0.5-2%;

and/or the electrolyte consists of the solvent, the electrolyte lithium salt and the compound shown in the formula I.

12. The use according to claim 11, wherein when the battery is a lithium battery, the lithium battery is a lithium primary battery, a secondary battery whose negative electrode is metallic lithium, or a lithium ion secondary battery;

and/or, when the electrolyte comprises a solvent, the solvent is a mixed solvent of ethylene carbonate and ethyl methyl carbonate, and the mass ratio of the ethylene carbonate to the ethyl methyl carbonate is 3: 7;

and/or, when the electrolyte comprises an electrolyte lithium salt, the electrolyte lithium salt is LiPF₆。

13. The application of fluorine-containing compounds shown as a formula I in preparing battery electrolyte;

wherein R is¹、R²、R³、R⁴、R⁵X and R^XIs as defined in any one of claims 1 to 9.

14. The use of claim 13, wherein the battery is a lithium or zinc battery;

and/or the electrolyte comprises a solvent;

and/or the electrolyte comprises an electrolyte lithium salt;

and/or the mass percentage of the compound shown in the formula I in the electrolyte is 0.1-5%.

15. The use according to claim 14, wherein when the battery is a lithium battery, the lithium battery is a lithium metal battery or a lithium ion battery;

and/or, when the electrolyte comprises a solvent, the solvent is water and/or an organic solvent; such as dimethyl carbonate, diethyl carbonate, ethylene carbonate, propylene carbonate, 2, 3-butanediol carbonate, 1, 2-pentanediol carbonate, 2-methyl-1, 2-butanediol carbonate, methyl ethylene carbonate, methyl ethyl carbonate, methyl propyl carbonate, methyl n-butyl carbonate, methyl isobutyl carbonate, 2-butyl methyl carbonate, methyl isopropyl carbonate, butylene carbonate, dibutyl carbonate, methyl butyl carbonate, fluoroethylene carbonate, 2,2, 2-trifluoroethyl methyl carbonate, 2,2, 2-trifluoroethyl ethyl carbonate, 2,2, 2-trifluoroethyl propyl carbonate, 2,2',2',2' -hexafluoroisopropyl methyl carbonate, 2, ethyl 2,2,2',2',2' -hexafluoroisopropyl carbonate, bis (2,2, 2-trifluoroethyl) carbonate, bis (2,2,3, 3-tetrafluoropropyl) carbonate, bis (2,2,3,3, 3-pentafluoropropyl) carbonate, 1,2, 2-tetrafluoroethyl-2, 2,3, 3-tetrafluoropropyl carbonate, 1,2,2, 2-pentafluoroethyl-2, 2,3,3, 3-pentafluoropropyl carbonate, 4- (2,2,3,3) -tetrafluoropropoxymethyl- [1,3] -dioxolan-2-one, 4- (2,3,3,3) -tetrafluoro-2-trifluoromethyl-propyl- [1,3] -dioxolan-2-one, Methyl formate, ethyl acetate, methyl propionate, ethyl propionate, methyl butyrate, ethyl butyrate, methyl acetate, cyclobutyrate, cypionate, azomethyloxazolidinone, methyl difluoroacetate, methyl trifluoroacetate, ethyl trifluoroacetate, 2,2, 2-trifluoro-N, N-dimethylacetamide, 1, -trifluoromethyl-N, N-dimethylformamide, dimethanol formal, ethylene glycol dimethyl ether, ethylene glycol diethyl ether, tetrahydrofuran, 2-methyltetrahydrofuran, 1, 3-dioxolane, 2-methyl-1, 3-dioxolane, 4-methyl-1, 3-dioxolane, 1,2, 2-tetrafluoroethyl-2, 2, 2-trifluoroethyl ether, 1,2, 2-tetrafluoroethyl-2, one or more of 2,3, 3-tetrafluoropropyl ether, methyl nonafluorobutyl ether, acetonitrile, 3-methoxypropionitrile, 3-ethoxypropionitrile, 3- (2,2, 2-trifluoroethoxy) propionitrile, malononitrile, succinonitrile, glutaronitrile, adiponitrile, pimelonitrile, suberonitrile, nonanonitrile, sebaconitrile, dimethyl methylphosphonate, dimethyl (2-methoxyethoxy) methylphosphonate, diethyl (2-methoxyethoxy) methylphosphonate, methylethylsulfone, sulfolane, dibutylsulfone, ethylvinylsulfone, methylisopropylsulfone, ethylisopropylsulfone, ethylisobutylsulfone, isopropylisobutylsulfone, 2-butylisopropylisopropylsulfone, n-butylisobutylsulfone, and 2-methoxyethylmethylsulfone;

and/or, when the electrolyte comprises an electrolyte lithium salt, the electrolyte lithium salt is LiPF₆、LiBF₄、LiClO₄、LiAsF₆、LiCF₃SO₃、LiB(CO₂CO₂)₂、LiBF₂(CO₂CO₂)、LiCl、LiN(SO₂CF₂CF₃)₂、LiN(SO₂CF₃)₂And LiN (SO)₂F)₂One or more of;

and/or, when the electrolyte comprises electrolyte lithium salt, the molar concentration of the electrolyte lithium salt in the electrolyte is 1 mol/L;

and/or the mass percent of the compound shown in the formula I in the electrolyte is 0.5-2%;

and/or the electrolyte consists of the solvent, the electrolyte lithium salt and the compound shown in the formula I.

16. The use according to claim 15, wherein when the battery is a lithium battery, the lithium battery is a lithium primary battery, a secondary battery whose negative electrode is metallic lithium, or a lithium ion secondary battery;

and/or, when the electrolyte comprises a solvent, the solvent is a mixed solvent of ethylene carbonate and ethyl methyl carbonate, and the mass ratio of the ethylene carbonate to the ethyl methyl carbonate is 3: 7;

and/or, when the electrolyte comprises an electrolyte lithium salt, the electrolyte lithium salt is LiPF₆。

17. A battery electrolyte comprising a solvent, an electrolyte and a substance A; the substance A is one or more compounds shown as the formula I in any one of claims 1 to 9.

18. The battery electrolyte of claim 17 wherein the battery is a lithium or zinc battery;

and/or the solvent is water and/or an organic solvent; such as dimethyl carbonate, diethyl carbonate, ethylene carbonate, propylene carbonate, 2, 3-butanediol carbonate, 1, 2-pentanediol carbonate, 2-methyl-1, 2-butanediol carbonate, methyl ethylene carbonate, methyl ethyl carbonate, methyl propyl carbonate, methyl n-butyl carbonate, methyl isobutyl carbonate, 2-butyl methyl carbonate, methyl isopropyl carbonate, butylene carbonate, dibutyl carbonate, methyl butyl carbonate, fluoroethylene carbonate, 2,2, 2-trifluoroethyl methyl carbonate, 2,2, 2-trifluoroethyl ethyl carbonate, 2,2, 2-trifluoroethyl propyl carbonate, 2,2',2',2' -hexafluoroisopropyl methyl carbonate, 2, ethyl 2,2,2',2',2' -hexafluoroisopropyl carbonate, bis (2,2, 2-trifluoroethyl) carbonate, bis (2,2,3, 3-tetrafluoropropyl) carbonate, bis (2,2,3,3, 3-pentafluoropropyl) carbonate, 1,2, 2-tetrafluoroethyl-2, 2,3, 3-tetrafluoropropyl carbonate, 1,2,2, 2-pentafluoroethyl-2, 2,3,3, 3-pentafluoropropyl carbonate, 4- (2,2,3,3) -tetrafluoropropoxymethyl- [1,3] -dioxolan-2-one, 4- (2,3,3,3) -tetrafluoro-2-trifluoromethyl-propyl- [1,3] -dioxolan-2-one, Methyl formate, ethyl acetate, methyl propionate, ethyl propionate, methyl butyrate, ethyl butyrate, methyl acetate, cyclobutyrate, cypionate, azomethyloxazolidinone, methyl difluoroacetate, methyl trifluoroacetate, ethyl trifluoroacetate, 2,2, 2-trifluoro-N, N-dimethylacetamide, 1, -trifluoromethyl-N, N-dimethylformamide, dimethanol formal, ethylene glycol dimethyl ether, ethylene glycol diethyl ether, tetrahydrofuran, 2-methyltetrahydrofuran, 1, 3-dioxolane, 2-methyl-1, 3-dioxolane, 4-methyl-1, 3-dioxolane, 1,2, 2-tetrafluoroethyl-2, 2, 2-trifluoroethyl ether, 1,2, 2-tetrafluoroethyl-2, one or more of 2,3, 3-tetrafluoropropyl ether, methyl nonafluorobutyl ether, acetonitrile, 3-methoxypropionitrile, 3-ethoxypropionitrile, 3- (2,2, 2-trifluoroethoxy) propionitrile, malononitrile, succinonitrile, glutaronitrile, adiponitrile, pimelonitrile, suberonitrile, nonanonitrile, sebaconitrile, dimethyl methylphosphonate, dimethyl (2-methoxyethoxy) methylphosphonate, diethyl (2-methoxyethoxy) methylphosphonate, methylethylsulfone, sulfolane, dibutylsulfone, ethylvinylsulfone, methylisopropylsulfone, ethylisopropylsulfone, ethylisobutylsulfone, isopropylisobutylsulfone, 2-butylisopropylisopropylsulfone, n-butylisobutylsulfone, and 2-methoxyethylmethylsulfone;

and/or the electrolyte is electrolyte lithium salt;

and/or the molar concentration of the electrolyte in the electrolyte is 1 mol/L;

and/or, the substance A is a compound shown in the formula I;

and/or the mass percentage of the substance A in the electrolyte is 0.1-5%;

and/or the electrolyte consists of the solvent, the electrolyte and the substance A.

19. The battery electrolyte as claimed in claim 18, wherein when the battery is a lithium battery, the lithium battery is a lithium primary battery, a secondary battery whose negative electrode is metallic lithium, or a lithium ion secondary battery;

and/or the solvent is a mixed solvent of ethylene carbonate and ethyl methyl carbonate, and the mass ratio of the ethylene carbonate to the ethyl methyl carbonate is 3: 7;

and/or, when the electrolyte is an electrolyte lithium salt, the electrolyte lithium salt is LiPF₆、LiBF₄、LiClO₄、LiAsF₆、LiCF₃SO₃、LiB(CO₂CO₂)₂、LiBF₂(CO₂CO₂)、LiCl、LiN(SO₂CF₂CF₃)₂、LiN(SO₂CF₃)₂And LiN (SO)₂F)₂One or more of;

and/or the mass percentage of the substance A in the electrolyte is 0.5-2%.

20. The battery electrolyte of claim 17, wherein any of the following:

scheme 1:

the solvent is a mixed solvent of ethylene carbonate and methyl ethyl carbonate, and the mass ratio of the ethylene carbonate to the methyl ethyl carbonate is 3: 7; the electrolyte is LiPF₆The molar concentration of the electrolyte in the electrolyte is 1 mol/L; the substance A is a compound shown in the formula I;

scheme 2:

the solvent is a mixed solvent of ethylene carbonate and methyl ethyl carbonate, and the mass ratio of the ethylene carbonate to the methyl ethyl carbonate is 3: 7; the electrolyte is LiPF₆The molar concentration of the electrolyte in the electrolyte is 1 mol/L; the substance A is

21. A battery, comprising: a casing, a positive electrode, a negative electrode, a separator and the battery electrolyte as claimed in any one of claims 17 to 20 enclosed within the casing.

22. The battery of claim 21, wherein the positive electrode comprises a positive electrode composite and a current collector, the positive electrode composite comprising a positive electrode active material, a binder, and a conductive agent;

and/or the diaphragm is a polypropylene diaphragm;

and/or the negative electrode is (1) metallic lithium, (2) lithium-containing alloy, or (3) a negative electrode composite material and a current collector, wherein the negative electrode composite material comprises a negative electrode active material, a binder and a conductive agent.

23. The battery of claim 22, wherein said positive electrode is comprised of said positive electrode composite and said current collector, said positive electrode composite being comprised of a positive electrode active material, a binder, and a conductive agent;

the positive active material is LiCoO₂、LiFePO₄、LiNi_xCo_yAl_1-x-yO₂And LiNi_xCo_yMn_1-x-yO₂Or, LiMn₂O₄、LiNi_0.5Mn_1.5O₄And Li₃V₂(PO₄)₃Wherein x is more than or equal to 0.1, y is more than or equal to 0.1 and less than or equal to 0.8, and x + y is more than or equal to 0.2 and less than or equal to 0.9; such as LiNi_0.8Co_0.1Mn_0.1O₂Or LiNi_0.5Mn_1.5O₄；

The mass percentage of the positive active material in the positive composite material is 80-97%;

the conductive agent is acetylene black; the mass percentage of the conductive agent in the positive electrode composite material is 1.5-10%;

the binder is polyvinylidene fluoride; the polyvinylidene fluoride isHSV 900 orPVDF; the mass percentage of the binder in the positive composite material is 1.5-10%;

the mass ratio of the conductive agent to the binder is 1: 1;

the current collector is an aluminum foil;

the diaphragm is2400 a polypropylene separator;

the negative electrode composite material consists of the negative electrode active material, the binder and the conductive agent;

the negative active material is graphite, a silicon-carbon composite material, mesocarbon microbeads, graphene or lithium titanate.

24. Fluorine-containing compounds shown as a formula II;

wherein R is¹、R²、R³、R⁴And R⁵Independently H, F, Cl, Br, I, "C₁-C₂₀Straight or branched alkyl of (2), (halogen-substituted C)₁-C₂₀Straight or branched alkyl of (2), "heteroatom-containing C₁-C₂₀The heteroatom is one or more of S, O, N, Si, P and B, and the "halogen-substituted heteroatom-containing C₁-C₂₀The heteroatom is one or more of S, O, N, Si, P and B, and the heteroatom is C₆-C₂₀Aryl of (2), "halogen-substituted C₆-C₂₀Aryl of (a),“C₄-C₂₀Wherein the heteroatom is one or more of S, O, N, Si, P and B or "halogen-substituted C₄-C₂₀Wherein the heteroatom is one or more of S, O, N, Si, P and B ";

and R is¹、R²、R³、R⁴And R⁵At least one of which is F;

x is nothing and C₁-C₂₀Straight or branched alkylene of (2), (halogen-substituted C)₁-C₂₀Straight or branched alkylene of (2), "" heteroatom-containing C₁-C₂₀The heteroatom is one or more of S, O, N, Si, P and B, or the' halogen substituted heteroatom-containing C₁-C₂₀Linear or branched alkylene with heteroatoms of one or more of S, O, N, Si, P and B ";

R^Xis "C₆-C₂₀Aryl of (2), "" R "^X-1Substituted C₆-C₂₀Aryl of (2), "" C₄-C₂₀Wherein the heteroatom is one or more of S, O, N, Si, P and B or R^X-2Substituted C₄-C₂₀Wherein the heteroatom is one or more of S, O, N, Si, P and B ";

R^X-1and R^X-2Independently F, Cl, Br, I, "C₁-C₂₀Straight or branched alkyl of (2), (halogen-substituted C)₁-C₂₀Straight or branched alkyl of (2), "heteroatom-containing C₁-C₂₀The heteroatom is one or more of S, O, N, Si, P and B, or' halogen substituted, heteroatom-containing C₁-C₂₀The heteroatom is one or more of S, O, N, Si, P and B;

but the fluorine-containing compound represented by the formula II is not the following compound:

25. the fluorochemical of claim 24, wherein R is R¹、R²、R³、R⁴And R⁵Is F;

and/or, X is nothing, "C₁-C₂₀Or "C containing hetero atoms₁-C₂₀Linear or branched alkylene with heteroatoms of one or more of S, O, N, Si, P and B ";

and/or, R^XIs "C₆-C₁₄Aryl of or^X-1Substituted C₆-C₁₄Aryl of (a);

and/or, R^X-1And R^X-2Independently is "C₁-C₂₀Straight or branched alkyl of (2), (halogen-substituted C)₁-C₂₀Straight or branched alkyl of (2), "heteroatom-containing C₁-C₂₀The heteroatom is one or more of S, O, N, Si, P and B, or' halogen substituted, heteroatom-containing C₁-C₂₀The heteroatom is one or more of S, O, N, Si, P and B ".

26. The fluorochemical of claim 25, wherein X is null or "C₁-C₂₀Linear or branched alkylene groups of ";

and/or, R^XIs "C₆-C₁₀Aryl of or^X-1Substituted C₆-C₁₀Aryl of (a);

and/or, R^X-1Independently is "C₁-C₂₀Linear or branched alkoxy ", or" halogen-substituted C₁-C₂₀Linear or branched alkyl groups of ".

27. The fluorochemical of claim 26, wherein X is methylene;

and/or, R^XIs R^X-1Substituted phenyl or naphthyl;

and/or, R^X-1Independently is "C₁-C₄Linear or branched alkoxy ", or" halogen-substituted C₁-C₄Linear or branched alkyl groups of ".

28. A fluorochemical according to claim 24, wherein said fluorochemical is defined in any of the following schemes:

scheme 1:

R¹、R²、R³、R⁴and R⁵Is F;

x is nothing and C₁-C₂₀Or "C containing hetero atoms₁-C₂₀Linear or branched alkylene with heteroatoms of one or more of S, O, N, Si, P and B ";

R^Xis "C₆-C₂₀Aryl of (2), "" R "^X-1Substituted C₆-C₂₀Aryl of (2), "" C₄-C₂₀Wherein the heteroatom is one or more of S, O, N, Si, P and B or R^X-2Substituted C₄-C₂₀Wherein the heteroatom is one or more of S, O, N, Si, P and B ";

R^X-1and R^X-2Independently is "C₁-C₂₀Straight or branched alkyl of (2), (halogen-substituted C)₁-C₂₀Straight or branched alkyl of (2), "heteroatom-containing C₁-C₂₀The heteroatom is one or more of S, O, N, Si, P and B, or' halogen substituted, heteroatom-containing C₁-C₂₀The heteroatom is one or more of S, O, N, Si, P and B;

scheme 2:

the compound shown in the formula II is a compound shown in a formula II-D or a formula II-E:

formula II-D:

formula II-E:

wherein R is⁶、R⁷、R⁸、R⁹、R¹⁰、R¹¹、R¹³And R¹⁴Independently is H or R^X-1；

For example, the compounds of formula II-D are compounds of formula II-A, formula II-B, or formula II-C:

formula II-A:

formula II-B:

formula II-C:

scheme 3:

R¹、R²、R³、R⁴and R⁵Is F;

x is nothing or' C₁-C₂₀Linear or branched alkylene groups of ";

R^Xis "C₆-C₁₄Aryl of or^X-1Substituted C₆-C₁₄Aryl of (a);

R^X-1independently is "C₁-C₂₀Linear or branched alkoxy ", or" halogen-substituted C₁-C₂₀Linear or branched alkyl groups of ";

and, scheme 4:

R¹、R²、R³、R⁴and R⁵Is F;

x is nothing or' C₁-C₄Linear or branched alkylene groups of ";

R^Xis "C₆-C₁₀Aryl of or^X-1Substituted C₆-C₁₀Aryl of (a);

R^X-1independently is "C₁-C₄Linear or branched alkoxy ", or" halogen-substituted C₁-C₄Linear or branched alkyl groups of ".

29. The fluorochemical of any of claims 24 to 28, wherein R is R¹、R²、R³、R⁴And R⁵Independently halogen substituted C₁-C₂₀When the alkyl group is a straight or branched alkyl group, said "C" is₁-C₂₀Is "C" or a linear or branched alkyl group of₁-C₄Linear or branched alkyl groups of ";

and/or when R¹、R²、R³、R⁴And R⁵Independently halogen substituted C₁-C₂₀When the alkyl group is a straight chain or branched chain alkyl group, the halogen is F, Cl, Br or I;

and/or when R¹、R²、R³、R⁴And R⁵Independently halogen substituted C₁-C₂₀In the case of the linear or branched alkyl group of (1), the number of said halogen is 1,2 or 3;

and/or when R¹、R²、R³、R⁴And R⁵Independently is "halogen-substituted, heteroatom-containing C₁-C₂₀When the heteroatom is one or more of S, O, N, Si, P and B, the 'C' is₁-C₂₀Is "C" or a linear or branched alkyl group of₁-C₄Linear or branched alkyl groups of ";

and/or when R¹、R²、R³、R⁴And R⁵Independently is "halogen-substituted, heteroatom-containing C₁-C₂₀When the heteroatom is one or more of S, O, N, Si, P and B', the halogen is F, Cl, Br or I;

and/or when R¹、R²、R³、R⁴And R⁵Independently is "halogen-substituted, heteroatom-containing C₁-C₂₀When the heteroatom is one or more of S, O, N, Si, P and B', the number of the halogen is 1,2 or 3;

and/or when R¹、R²、R³、R⁴And R⁵Independently is "halogen-substituted, heteroatom-containing C₁-C₂₀When the heteroatom is one or more of S, O, N, Si, P and B', the number of the heteroatom is 1,2 or 3;

and/or when R¹、R²、R³、R⁴And R⁵Independently is "halogen-substituted, heteroatom-containing C₁-C₂₀When the heteroatom is one or more of S, O, N, Si, P and B ", the heteroatom is one or more of S, O and N;

and/or, when X is C₁-C₂₀When the alkylene group is a straight chain or branched chain alkylene group, the "C" is₁-C₂₀Is "C" or a branched or unbranched alkylene group₁-C₄Linear or branched alkylene groups of ";

and/or, when X is halogen-substituted C₁-C₂₀When the alkylene group is a straight chain or branched chain alkylene group, the "C" is₁-C₂₀Is "C" or a branched or unbranched alkylene group₁-C₄Linear or branched alkylene groups of ";

and/or, when X is halogen-substituted C₁-C₂₀When the alkylene group is a straight chain or branched chain alkylene group, the halogen is F, Cl, Br or I;

and/or, when X is halogen-substituted C₁-C₂₀Of straight-chain or branched alkylene, of said halogenThe number is 1,2 or 3;

and/or, when X is "heteroatom containing C₁-C₂₀When the hetero atom is one or more of S, O, N, Si, P and B, the "C" is₁-C₂₀Is "C" or a branched or unbranched alkylene group₁-C₄Linear or branched alkylene groups of ";

and/or, when X is "heteroatom containing C₁-C₂₀When the heteroatom is one or more of S, O, N, Si, P and B', the number of the heteroatoms is 1,2 or 3;

and/or, when X is "heteroatom containing C₁-C₂₀When the heteroatom is one or more of S, O, N, Si, P and B', the heteroatom is one or more of S, O and N;

and/or, when X is "halogen-substituted, heteroatom-containing C₁-C₂₀When the hetero atom is one or more of S, O, N, Si, P and B, the "C" is₁-C₂₀Is "C" or a branched or unbranched alkylene group₁-C₄Linear or branched alkylene groups of ";

and/or, when X is "halogen-substituted, heteroatom-containing C₁-C₂₀When the heteroatom is one or more of S, O, N, Si, P and B', the halogen is F, Cl, Br or I;

and/or, when X is "halogen-substituted, heteroatom-containing C₁-C₂₀When the heteroatom is one or more of S, O, N, Si, P and B', the number of the halogen is 1,2 or 3;

and/or, when X is "halogen-substituted, heteroatom-containing C₁-C₂₀When the heteroatom is one or more of S, O, N, Si, P and B', the number of the heteroatoms is 1,2 or 3;

and/or, when X is "halogen-substituted, heteroatom-containing C₁-C₂₀When the heteroatom is one or more of S, O, N, Si, P and B', the heteroatom is one or more of S, O and N;

and/or when R^XIs C₆-C₂₀Aryl of (2), said C₆-C₂₀Aryl of is C₆-C₁₄Aryl of (a);

and/or when R^XIs R^X-1Substituted C₆-C₂₀Aryl of (2), said C₆-C₂₀Aryl of is C₆-C₁₄Aryl of (a);

and/or when R^XIs R^X-1Substituted C₆-C₂₀When aryl of (A) is said R^X-1The number of (a) is 1,2 or 3;

and/or when R^XIs R^X-1Substituted C₆-C₂₀When aryl of (A) is said R^XIndependently from said X, each is ortho, meta or para;

and/or when R^X-1Independently is "heteroatom containing C₁-C₂₀When the heteroatom is one or more of S, O, N, Si, P and B, the 'heteroatom-containing C' is₁-C₂₀Is one or more of S, O, N, Si, P and B, and is' C₁-C₂₀Linear or branched alkoxy of ";

and/or when R^X-1Independently halogen substituted C₁-C₂₀When the alkyl group is a straight or branched alkyl group, said "C" is₁-C₂₀Is "C" or a linear or branched alkyl group of₁-C₄Linear or branched alkyl groups of ";

and/or when R^X-1Independently halogen substituted C₁-C₂₀When the alkyl group is a straight chain or branched chain alkyl group, the halogen is F, Cl, Br or I;

and/or when R^X-1Independently halogen substituted C₁-C₂₀In the case of the linear or branched alkyl group of (1), the number of said halogen is 1,2 or 3;

and/or when R^X-1Independently is "halogen-substituted, heteroatom-containing C₁-C₂₀When the heteroatom is one or more of S, O, N, Si, P and B, the 'C' is₁-C₂₀Is "C" or a linear or branched alkyl group of₁-C₄Linear or branched alkyl groups of ";

and/or when R^X-1Independently is "halogen-substituted, heteroatom-containing C₁-C₂₀When the heteroatom is one or more of S, O, N, Si, P and B', the halogen is F, Cl, Br or I;

and/or when R^X-1Independently is "halogen-substituted, heteroatom-containing C₁-C₂₀When the heteroatom is one or more of S, O, N, Si, P and B', the number of the halogen is 1,2 or 3;

and/or the halogen is F, Cl, Br or I.

30. The fluorochemical of claim 29, wherein when R is¹、R²、R³、R⁴And R⁵Independently halogen substituted C₁-C₂₀When the alkyl group is a straight or branched alkyl group, said "C" is₁-C₂₀The straight or branched alkyl group of "is methyl, ethyl, n-propyl, isopropyl, n-butyl, sec-butyl, isobutyl or tert-butyl;

and/or when R¹、R²、R³、R⁴And R⁵Independently is "halogen-substituted, heteroatom-containing C₁-C₂₀When the heteroatom is one or more of S, O, N, Si, P and B, the 'C' is₁-C₂₀The straight or branched alkyl group of "is methyl, ethyl, n-propyl, isopropyl, n-butyl, sec-butyl, isobutyl or tert-butyl;

and/or, when X is C₁-C₂₀When the alkylene group is a straight chain or branched chain alkylene group, said "C₁-C₂₀The straight or branched alkylene group "of (a) is a methylene group or an ethylene group;

and/or, when X is halogen-substituted C₁-C₂₀When the alkylene group is a straight chain or branched chain alkylene group, the "C" is₁-C₂₀The straight or branched alkylene group "of (a) is a methylene group or an ethylene group;

and/or, when X is "heteroatom containing C₁-C₂₀When the hetero atom is one or more of S, O, N, Si, P and B, the "C" is₁-C₂₀The straight or branched alkylene group "of (a) is a methylene group or an ethylene group;

and/or, when X is "halogen-substituted, heteroatom-containing C₁-C₂₀When the hetero atom is one or more of S, O, N, Si, P and B, the "C" is₁-C₂₀The straight or branched alkylene group "of (a) is a methylene group or an ethylene group;

and/or when R^XIs C₆-C₂₀Aryl of (2), said C₆-C₂₀Aryl of is C₆-C₁₀Aryl of (a);

and/or when R^XIs R^X-1Substituted C₆-C₂₀Aryl of (2), said C₆-C₂₀Aryl of is C₆-C₁₀Aryl of (a);

and/or when R^XIs R^X-1Substituted C₆-C₂₀When aryl of (A) is said R^X-1The number of (2) is 1 or 2;

and/or when R^XIs R^X-1Substituted C₆-C₂₀When aryl of (A) is said R^XIndependently meta or para to said X;

and/or when R^X-1Independently is "heteroatom containing C₁-C₂₀When the heteroatom is one or more of S, O, N, Si, P and B, the 'heteroatom-containing C' is₁-C₂₀Is one or more of S, O, N, Si, P and BMethoxy, ethoxy, n-propoxy, isopropoxy, n-butoxy, sec-butoxy, isobutoxy or tert-butoxy;

and/or when R^X-1Independently halogen substituted C₁-C₂₀When the alkyl group is a straight or branched alkyl group, said "C" is₁-C₂₀The straight or branched alkyl group of "is methyl, ethyl, n-propyl, isopropyl, n-butyl, sec-butyl, isobutyl or tert-butyl;

and/or when R^X-1Independently is "halogen-substituted, heteroatom-containing C₁-C₂₀When the heteroatom is one or more of S, O, N, Si, P and B, the 'C' is₁-C₂₀The straight-chain or branched alkyl group "of (a) is methyl, ethyl, n-propyl, isopropyl, n-butyl, sec-butyl, isobutyl or tert-butyl.

31. The fluorochemical of claim 30, wherein when R is¹、R²、R³、R⁴And R⁵Independently halogen substituted C₁-C₂₀When the alkyl group is a straight or branched alkyl group, said halogen is substituted by C₁-C₂₀The linear or branched alkyl group of (a) is trifluoromethyl;

and/or, when X is C₁-C₂₀When the alkylene group is a straight chain or branched chain alkylene group, the "C" is₁-C₂₀The straight or branched chain alkylene group "of (a) is a methylene group;

and/or, when X is halogen-substituted C₁-C₂₀When the alkylene group is a straight chain or branched chain alkylene group, the "C" is₁-C₂₀The straight or branched chain alkylene group "of (a) is a methylene group;

and/or, when X is "heteroatom containing C₁-C₂₀When the hetero atom is one or more of S, O, N, Si, P and B, the "C" is₁-C₂₀The straight or branched chain alkylene group "of (a) is a methylene group;

and/or, when X is "halogen-substituted, heteroatom-containing C₁-C₂₀Of a straight chain orBranched alkylene, when the hetero atom is one or more of S, O, N, Si, P and B, the "C" is₁-C₂₀The straight or branched chain alkylene group "of (a) is a methylene group;

and/or when R^XIs C₆-C₂₀Aryl of (2), said C₆-C₂₀Aryl of (a) is phenyl, naphthalen-1-yl, or naphthalen-2-yl;

and/or when R^XIs R^X-1Substituted C₆-C₂₀Aryl of (2), said C₆-C₂₀Aryl of (a) is phenyl, naphthalen-1-yl, or naphthalen-2-yl;

and/or when R^XIs R^X-1Substituted C₆-C₂₀When aryl of (A) is said R^X-1The number of (A) is 1, C₆-C₂₀Aryl of (A) is phenyl, said R^XIs meta or para to the X; or, said R^X-1The number of (2), C₆-C₂₀Aryl of (A) is phenyl, said R^XIs meta to said X;

and/or when R^X-1Independently is "heteroatom containing C₁-C₂₀When the heteroatom is one or more of S, O, N, Si, P and B, the 'heteroatom-containing C' is₁-C₂₀Is one or more of S, O, N, Si, P and B, and is methoxy;

and/or when R^X-1Independently halogen substituted C₁-C₂₀When the alkyl group is a straight or branched alkyl group, said halogen is substituted by C₁-C₂₀The linear or branched alkyl group of (a) is a trifluoromethyl group.

32. The fluorochemical of claim 24, wherein the fluorochemical is of formula II

Technical Field

The invention provides a fluorine-containing compound and application thereof.

Background

At present, lithium ion batteries are widely applied to portable electronic products such as mobile phones and computers, and lithium ion batteries which are safer, more stable, longer in cycle life, higher in energy density and lower in cost are needed in applications such as electric vehicles and large-scale fixed energy storage. The purpose of high energy density can be realized by selecting the anode material with high specific capacity and high platform voltage, but the cycle stability and the cycle life of the anode material of the lithium ion battery still restrict the commercial application of the anode material with high energy density.

Research shows that one of the main reasons influencing the charge-discharge cycle performance attenuation of the lithium ion battery is the instability of an electrode-electrolyte interface. Conventional electrolyte systems, such as from electrolytic lithium salt (LiPF), during battery charge-discharge cycles₆) An electrolyte solution which is dissolved in a mixed solvent of cyclic carbonate and linear carbonate such as organic solvents of Ethylene Carbonate (EC), dimethyl carbonate (DMC), Ethyl Methyl Carbonate (EMC) and the like can generate side reactions such as oxidative decomposition and the like on the surface of a positive electrode, on one hand, the generated oxidative decomposition side reaction can generate gas to destroy the structure of the battery, and on the other hand, the electrolyte solution is decomposed to generate unstable carbonate or halogen salt on the surface of an electrode to increase the impedance of the battery; in addition, the electrode material itself is also corroded by strong corrosive acids such as by-product HF, and there is dissolution of transition metals. The problems cause the increase of polarization and impedance of the lithium ion battery, and lead to poor stability of charge and discharge cycles and short cycle life of the battery.

Disclosure of Invention

The invention aims to solve the technical problem that the cycling stability of the existing lithium ion battery is poor due to the instability of electrolyte in the charging and discharging cycling process, so that the invention provides a class of fluorine-containing compounds and application thereof. The compound reduces the irreversible capacity loss of the lithium ion battery, obviously improves the discharge capacity, the working voltage, the cycle life and the cycle stability of the lithium ion battery on the basis of controlling the commercial cost, can be quickly applied in the commercial development, and effectively controls the commercial cost.

The invention provides an application of a fluorine-containing compound shown as a formula I as a battery electrolyte additive;

wherein R is¹、R²、R³、R⁴And R⁵Independently H, F, Cl, Br, I, "C₁-C₂₀Straight or branched alkyl of (2), (halogen-substituted C)₁-C₂₀Straight or branched alkyl of (2), "heteroatom-containing C₁-C₂₀The heteroatom is one or more of S, O, N, Si, P and B, and the "halogen-substituted heteroatom-containing C₁-C₂₀The heteroatom is one or more of S, O, N, Si, P and B, and the heteroatom is C₆-C₂₀Aryl of (2), "halogen-substituted C₆-C₂₀Aryl of (2), "" C₄-C₂₀Wherein the heteroatom is one or more of S, O, N, Si, P and B or "halogen-substituted C₄-C₂₀Wherein the heteroatom is one or more of S, O, N, Si, P and B ";

and R is¹、R²、R³、R⁴And R⁵At least one of which is F;

x is absent (meaning R^XAnd a benzene ring through C^Sp2-C^Sp2Connected with a key), "C₁-C₂₀Straight or branched alkylene of (2), (halogen-substituted C)₁-C₂₀Straight or branched alkylene of (2), "" heteroatom-containing C₁-C₂₀The heteroatom is one or more of S, O, N, Si, P and B, or the' halogen substituted heteroatom-containing C₁-C₂₀Linear or branched alkylene with heteroatoms of one or more of S, O, N, Si, P and B ";

R^Xis "C₆-C₂₀Aryl of (2), "" R "^X-1Substituted C₆-C₂₀Aryl of (2), "" C₄-C₂₀Wherein the heteroatom is one or more of S, O, N, Si, P and B or R^X-2Substituted C₄-C₂₀Wherein the heteroatom is one or more of S, O, N, Si, P and B ";

R^X-1and R^X-2Independently F, Cl, Br, I, "C₁-C₂₀Straight or branched alkyl of (2), (halogen-substituted C)₁-C₂₀Straight or branched alkyl of (2), "heteroatom-containing C₁-C₂₀The heteroatom is one or more of S, O, N, Si, P and B, or' halogen substituted, heteroatom-containing C₁-C₂₀The heteroatom is one or more of S, O, N, Si, P and B ".

In one aspect of the application, certain features have the following meanings, and other features have the meanings as described in any of the aspects above (hereinafter referred to as "in one aspect of the application"):

R¹、R²、R³、R⁴and R⁵May be F.

In one embodiment of the application, X may be nothing, "C₁-C₂₀Or "C containing hetero atoms₁-C₂₀The heteroatom is one or more of S, O, N, Si, P and B ".

In one embodiment of the application, X may be absent or "C₁-C₂₀Linear or branched alkylene groups of ".

In a certain scheme of the applicationX may be absent or "C₁-C₄Linear or branched alkylene groups of ".

In one embodiment of the application, X may be nothing or CH₂。

In a certain aspect of the application, R^XCan be "C₆-C₁₄Aryl of or^X-1Substituted C₆-C₁₄An aryl group of (1).

In a certain aspect of the application, R^XCan be "C₆-C₁₀Aryl of or^X-1Substituted C₆-C₁₀An aryl group of (1).

In a certain aspect of the application, R^XCan be R^X-1Substituted phenyl or naphthyl.

In a certain aspect of the application, R^X-1And R^X-2May independently be "C₁-C₂₀Straight or branched alkyl of (2), (halogen-substituted C)₁-C₂₀Straight or branched alkyl of (2), "heteroatom-containing C₁-C₂₀The heteroatom is one or more of S, O, N, Si, P and B, or' halogen substituted, heteroatom-containing C₁-C₂₀The heteroatom is one or more of S, O, N, Si, P and B ".

In a certain aspect of the application, R^X-1May independently be "C₁-C₂₀Linear or branched alkoxy ", or" halogen-substituted C₁-C₂₀Linear or branched alkyl groups of ".

In a certain aspect of the application, R^X-1May independently be "C₁-C₄Linear or branched alkoxy ", or" halogen-substituted C₁-C₄Linear or branched alkyl groups of ".

In one aspect of the application, X may be "C₁-C₂₀Straight or branched alkylene of (2), (halogen-substituted C)₁-C₂₀Straight or branched alkylene of (2), "" heteroatom-containing C₁-C₂₀A straight-chain or branched alkylene group of (a), the hetero atoms being S, O, N, Si,One or more of P and B ", or" halogen-substituted, heteroatom-containing C₁-C₂₀The heteroatom is one or more of S, O, N, Si, P and B ".

In one aspect of the application, X may be "C₁-C₂₀Linear or branched alkylene groups of ".

In one embodiment of the application, X may be methylene.

In one aspect of the application:

R¹、R²、R³、R⁴and R⁵Can be F;

x can be nothing, "C₁-C₂₀Or "C containing hetero atoms₁-C₂₀Linear or branched alkylene with heteroatoms of one or more of S, O, N, Si, P and B ";

R^Xcan be "C₆-C₂₀Aryl of (2), "" R "^X-1Substituted C₆-C₂₀Aryl of (2), "" C₄-C₂₀Wherein the heteroatom is one or more of S, O, N, Si, P and B or R^X-2Substituted C₄-C₂₀Wherein the heteroatom is one or more of S, O, N, Si, P and B ";

R^X-1and R^X-2May independently be "C₁-C₂₀Straight or branched alkyl of (2), (halogen-substituted C)₁-C₂₀Straight or branched alkyl of (2), "heteroatom-containing C₁-C₂₀The heteroatom is one or more of S, O, N, Si, P and B, or' halogen substituted, heteroatom-containing C₁-C₂₀The heteroatom is one or more of S, O, N, Si, P and B ".

In one embodiment of the application, the compound of formula I may be a compound of formula D or formula E:

formula D:

formula E:

wherein R is⁶、R⁷、R⁸、R⁹、R¹⁰、R¹¹、R¹³And R¹⁴Independently is H or R^X-1。

In one embodiment of the application, the compound represented by formula D may be a compound represented by formula a, formula B, or formula C:

formula A:

formula B:

formula C:

in one aspect of the application:

R¹、R²、R³、R⁴and R⁵Can be F;

x may be absent or "C₁-C₂₀Linear or branched alkylene groups of ";

R^Xcan be "C₆-C₁₄Aryl of or^X-1Substituted C₆-C₁₄Aryl of (a);

R^X-1may independently be "C₁-C₂₀Linear or branched alkoxy ", or" halogen-substituted C₁-C₂₀Linear or branched alkyl groups of ".

In one aspect of the application:

R¹、R²、R³、R⁴and R⁵Can be F;

x may be absent or "C₁-C₄Linear or branched alkylene groups of ";

R^Xcan be "C₆-C₁₀Aryl of or^X-1Substituted C₆-C₁₀Aryl of (a);

R^X-1may independently be "C₁-C₄Linear or branched alkoxy ", or" halogen-substituted C₁-C₄Linear or branched alkyl groups of ".

In one aspect of the application, when R¹、R²、R³、R⁴And R⁵Independently halogen substituted C₁-C₂₀When the alkyl group is a straight or branched alkyl group, said "C" is₁-C₂₀The linear or branched alkyl group of "may be" C₁-C₄The straight-chain or branched alkyl group "of (a) may be, in turn, methyl, ethyl, n-propyl, isopropyl, n-butyl, sec-butyl, isobutyl or tert-butyl, and may also be methyl.

In one aspect of the application, when R¹、R²、R³、R⁴And R⁵Independently halogen substituted C₁-C₂₀When the alkyl group is a straight chain or branched chain alkyl group, the halogen may be F, Cl, Br or I.

In one aspect of the application, when R¹、R²、R³、R⁴And R⁵Independently halogen substituted C₁-C₂₀In the case of the straight-chain or branched alkyl group of (2), the number of the halogen is at least one, and may be 1,2 or 3.

In one aspect of the application, when R¹、R²、R³、R⁴And R⁵Independently halogen substituted C₁-C₂₀When the alkyl group is a straight or branched alkyl group, said halogen is substituted by C₁-C₂₀The linear or branched alkyl group of (a) is a trifluoromethyl group.

In one aspect of the application, when R¹、R²、R³、R⁴And R⁵Independently is "halogen-substituted, heteroatom-containing C₁-C₂₀The linear or branched alkyl group of (a),when the heteroatom is one or more of S, O, N, Si, P and B, the 'C' is₁-C₂₀The linear or branched alkyl group of "may be" C₁-C₄The straight-chain or branched alkyl group "of (a) may be, in turn, methyl, ethyl, n-propyl, isopropyl, n-butyl, sec-butyl, isobutyl or tert-butyl, and may also be methyl.

In one aspect of the application, when R¹、R²、R³、R⁴And R⁵Independently is "halogen-substituted, heteroatom-containing C₁-C₂₀When the heteroatom is one or more of S, O, N, Si, P and B ", the halogen can be F, Cl, Br or I.

In one aspect of the application, when R¹、R²、R³、R⁴And R⁵Independently is "halogen-substituted, heteroatom-containing C₁-C₂₀When the heteroatom is one or more of S, O, N, Si, P and B ", the number of the halogen is at least one, and can be 1,2 or 3.

In one aspect of the application, when R¹、R²、R³、R⁴And R⁵Independently is "halogen-substituted, heteroatom-containing C₁-C₂₀When the heteroatom is one or more of S, O, N, Si, P and B ", the number of the heteroatoms may be 1,2 or 3.

In one aspect of the application, when R¹、R²、R³、R⁴And R⁵Independently is "halogen-substituted, heteroatom-containing C₁-C₂₀When the heteroatom is one or more of S, O, N, Si, P and B, "the heteroatom may be one or more of S, O and N.

In a certain scheme of application, when X is C₁-C₂₀When the alkylene group is a straight chain or branched chain alkylene group, the "C" is₁-C₂₀The straight-chain or branched alkylene group of "may be" C₁-C₄Linear or branched alkylene ofThe radical "may be a methylene or ethylene radical, and may also be a methylene radical.

In one embodiment of the application, when X is halogen-substituted C₁-C₂₀When the alkylene group is a straight chain or branched chain alkylene group, the "C" is₁-C₂₀The straight-chain or branched alkylene group of "may be" C₁-C₄The linear or branched alkylene group "of (a) may be a methylene group or an ethylene group, and may be a methylene group.

In one embodiment of the application, when X is halogen-substituted C₁-C₂₀When the alkylene group is a straight chain or branched chain alkylene group, the halogen may be F, Cl, Br or I.

In one embodiment of the application, when X is halogen-substituted C₁-C₂₀In the case of the straight-chain or branched alkylene group(s), the number of the halogen(s) is at least one, and may be 1,2 or 3.

In one embodiment of the application, when X is "C containing a heteroatom₁-C₂₀When the hetero atom is one or more of S, O, N, Si, P and B, the "C" is₁-C₂₀The straight-chain or branched alkylene group of "may be" C₁-C₄The linear or branched alkylene group "of (a) may be a methylene group or an ethylene group, and may be a methylene group.

In one embodiment of the application, when X is "C containing a heteroatom₁-C₂₀When the heteroatom is one or more of S, O, N, Si, P and B ", the number of said heteroatom may be 1,2 or 3.

In one embodiment of the application, when X is "C containing a heteroatom₁-C₂₀When the heteroatom is one or more of S, O, N, Si, P and B ", the heteroatom may be one or more of S, O and N.

In one embodiment of the application, when X is "halogen-substituted, heteroatom-containing C₁-C₂₀When the hetero atom is one or more of S, O, N, Si, P and B, the "C" is₁-C₂₀Linear or branched alkylene ofThe radical "may be" C₁-C₄The linear or branched alkylene group "of (a) may be a methylene group or an ethylene group, and may be a methylene group.

In one embodiment of the application, when X is "halogen-substituted, heteroatom-containing C₁-C₂₀When the heteroatom is one or more of S, O, N, Si, P and B', the halogen can be F, Cl, Br or I.

In one embodiment of the application, when X is "halogen-substituted, heteroatom-containing C₁-C₂₀When the heteroatom is one or more of S, O, N, Si, P and B ", the number of said halogen is at least one, and may be 1,2 or 3.

In one embodiment of the application, when X is "halogen-substituted, heteroatom-containing C₁-C₂₀When the heteroatom is one or more of S, O, N, Si, P and B ", the number of said heteroatom may be 1,2 or 3.

In one embodiment of the application, when X is "halogen-substituted, heteroatom-containing C₁-C₂₀When the heteroatom is one or more of S, O, N, Si, P and B ", the heteroatom may be one or more of S, O and N.

In one aspect of the application, when R^XIs C₆-C₂₀Aryl of (2), said C₆-C₂₀Aryl of (A) may be C₆-C₁₄Aryl of (a) may also be C₆-C₁₀The aryl group of (a) may also be phenyl or naphthyl, more preferably phenyl, naphthalen-1-yl, or naphthalen-2-yl.

In one aspect of the application, when R^XIs R^X-1Substituted C₆-C₂₀Aryl of (2), said C₆-C₂₀Aryl of (A) may be C₆-C₁₄Aryl of (a) may also be C₆-C₁₀The aryl group of (a) may also be phenyl or naphthyl, more preferably phenyl, naphthalen-1-yl, or naphthalen-2-yl.

In a certain aspect of the application,when R is^XIs R^X-1Substituted C₆-C₂₀When aryl of (A) is said R^X-1The number of (a) may be 1,2 or 3, and may be 1 or 2.

In one aspect of the application, when R^XIs R^X-1Substituted C₆-C₂₀When aryl of (A) is said R^XAnd X can be independently ortho, meta or para to each other, and can be independently meta or para to each other.

In one aspect of the application, when R^XIs R^X-1Substituted C₆-C₂₀When aryl of (A) is said R^X-1The number of (A) can be 1, C₆-C₂₀The aryl group of (A) may be phenyl, said R being^XAnd the X is meta or para.

In one aspect of the application, when R^XIs R^X-1Substituted C₆-C₂₀When aryl of (A) is said R^X-1The number of (2) can be provided, C₆-C₂₀The aryl group of (A) may be phenyl, said R being^XAnd the position of the X is meta.

In one aspect of the application, when R^X-1Independently is "heteroatom containing C₁-C₂₀When the heteroatom is one or more of S, O, N, Si, P and B, the 'heteroatom-containing C' is₁-C₂₀Is one or more of S, O, N, Si, P and B, and can be C₁-C₂₀The linear or branched alkoxy group of (b) may also be "C₁-C₄The straight-chain or branched alkoxy group "of (a) may also be methoxy, ethoxy, n-propoxy, isopropoxy, n-butoxy, sec-butoxy, isobutoxy or tert-butoxy, more preferably methoxy.

In one aspect of the application, when R^X-1Independently halogen substituted C₁-C₂₀When the alkyl group is a straight or branched alkyl group, said "C" is₁-C₂₀The linear or branched alkyl group of "may be" C₁-C₄The straight chain or branched chain alkyl group' of (1) can also be methyl or ethylAlkyl, n-propyl, isopropyl, n-butyl, sec-butyl, isobutyl or tert-butyl, and also methyl.

In one aspect of the application, when R^X-1Independently halogen substituted C₁-C₂₀When the alkyl group is a straight chain or branched chain alkyl group, the halogen may be F, Cl, Br or I.

In one aspect of the application, when R^X-1Independently halogen substituted C₁-C₂₀In the case of the straight-chain or branched alkyl group of (2), the number of the halogen is at least one, and may be 1,2 or 3.

In one aspect of the application, when R^X-1Independently halogen substituted C₁-C₂₀When the alkyl group is a straight or branched alkyl group, said halogen is substituted by C₁-C₂₀The linear or branched alkyl group of (a) is a trifluoromethyl group.

In one aspect of the application, when R^X-1Independently is "halogen-substituted, heteroatom-containing C₁-C₂₀When the heteroatom is one or more of S, O, N, Si, P and B, the 'C' is₁-C₂₀The linear or branched alkyl group of "may be" C₁-C₄The straight-chain or branched alkyl group "of (a) may be, in turn, methyl, ethyl, n-propyl, isopropyl, n-butyl, sec-butyl, isobutyl or tert-butyl, and may also be methyl.

In one aspect of the application, when R^X-1Independently is "halogen-substituted, heteroatom-containing C₁-C₂₀When the heteroatom is one or more of S, O, N, Si, P and B ", the halogen can be F, Cl, Br or I.

In one aspect of the application, when R^X-1Independently is "halogen-substituted, heteroatom-containing C₁-C₂₀When the heteroatom is one or more of S, O, N, Si, P and B ", the number of the halogen is at least one, and can be 1,2 or 3.

In one embodiment, the halogen may be F, Cl, Br or I.

In a certain embodiment of the application, the compound represented by the formula I can be any one of the following compounds:

in one aspect of the application, the battery may be a conventional battery, such as a lithium battery or a zinc battery. The lithium battery may be a conventional lithium battery, such as a lithium metal battery or a lithium ion battery. The lithium metal battery can be a lithium primary battery or a secondary battery with a negative electrode made of metal lithium. The lithium ion battery can be a lithium ion secondary battery.

In one embodiment, the electrolyte may include a solvent.

In a certain application, when the electrolyte may comprise a solvent, the solvent may be a solvent that is conventional in electrolytes in the battery field (especially in the lithium ion battery field), such as water and/or an organic solvent.

In one embodiment of the application, the organic solvent may be an organic solvent which is conventional in electrolytes for batteries, especially lithium ion batteries, such as dimethyl carbonate (DMC), diethyl carbonate (DEC), Ethylene Carbonate (EC), Propylene Carbonate (PC), 2, 3-butylene carbonate (2,3-BC), 1, 2-butylene carbonate (1,2-BC), 1, 2-pentylene carbonate (PIC), 2-methyl-1, 2-butylene carbonate (i-BC), methylethyl carbonate (EMC), methylpropyl carbonate (MPC), methyl n-butyl carbonate (n-BMC), methyl isobutyl carbonate (i-BMC), 2-butylmethyl carbonate (s-BMC), methylisopropyl carbonate (n-BMC), and mixtures thereof, Butylene carbonate, dibutyl carbonate (DBC), methylbutyl carbonate, fluoroethylene carbonate (FEC), methyl 2,2, 2-trifluoroethyl carbonate (MTFEC), ethyl 2,2, 2-trifluoroethyl carbonate (ETFEC), propyl 2,2, 2-trifluoroethyl carbonate (PTFEC), methyl 2,2,2,2',2',2 '-hexafluoroisopropyl carbonate (MHFPC), ethyl 2,2,2',2',2' -hexafluoroisopropyl carbonate (EHFPC), bis (2,2, 2-trifluoroethyl) carbonate (DTFEC), bis (2,2,3, 3-tetrafluoropropyl) carbonate, bis (2,2,3,3, 3-pentafluoropropyl) carbonate, 1,2, 2-tetrafluoroethyl-2, 2,3, 3-tetrafluoropropyl carbonate, 1,2,2, 2-pentafluoroethyl-2, 2,3,3, 3-pentafluoropropyl carbonate, 4- (2,2,3,3) -tetrafluoropropoxymethyl- [1,3] -dioxolan-2-one, 4- (2,3,3,3) -tetrafluoro-2-trifluoromethyl-propyl- [1,3] -dioxolan-2-one, Methyl Formate (MF), Ethyl Acetate (EA), Methyl Propionate (MP), Ethyl Propionate (EP), Methyl Butyrate (MB), Ethyl Butyrate (EB), Methyl Acetate (MA), cyclobutyrate (γ BL), cypionate (γ VL), azomethyloxazolidinone (NMO), methyl difluoroacetate, methyl trifluoroacetate, ethyl trifluoroacetate, 2,2, 2-trifluoro-N, n-dimethylacetamide (TFECm), 1-trifluoromethyl-N, N-dimethylformamide (Cm HFP), dimethanol formal (DMM), ethylene glycol dimethyl ether (DME), ethylene glycol diethyl ether (DEE), Tetrahydrofuran (THF), 2-methyltetrahydrofuran (2-Me-THF), 1, 3-dioxolane (1,3-DL), 2-methyl-1, 3-dioxolane (2-Me-1,3-DL), 4-methyl-1, 3-dioxolane (4-Me-1,3-DL), 1,2, 2-tetrafluoroethyl-2, 2, 2-trifluoroethyl ether, 1,2, 2-tetrafluoroethyl-2, 2,3, 3-tetrafluoropropyl ether, One or more of methyl nonafluorobutyl ether, Acetonitrile (AN), 3-Methoxypropionitrile (MPN), 3-Ethoxypropionitrile (EPN), 3- (2,2, 2-trifluoroethoxy) propionitrile (EPN), Malononitrile (MAN), Succinonitrile (SCN), Glutaronitrile (GLN), Adiponitrile (ADN), Pimelonitrile (PMN), Suberonitrile (SUN), nonanedionitrile (AZN), Sebaconitrile (SEN), dimethyl methylphosphonate (DMMP), (2-methoxyethoxy) dimethyl methylphosphonate (DMMEMP), (2-methoxyethoxy) diethyl methylphosphonate (DEEMP), methylethylsulfone, sulfolane, dibutylsulfone, ethylvinylsulfone, methylisopropylsulfone, ethylisopropylsulfone, ethylisobutylsulfone, isopropylisobutylsulfone, 2-butylisopropylsulfolane, n-butylisobutylsulfone, and 2-methoxyethylmethylsulfone, for example, a mixed solvent of ethylene carbonate and ethyl methyl carbonate, and for example, "a mixed solvent of ethylene carbonate and ethyl methyl carbonate, the mass ratio of ethylene carbonate to ethyl methyl carbonate is 3: 7".

In one aspect of the application, the electrolyte may include an electrolytic lithium salt.

In one embodiment of the application, the electrolyte lithium salt may be a conventional electrolyte lithium salt in an electrolyte in the field of lithium ion batteries, such as LiPF₆、LiBF₄、LiClO₄、LiAsF₆、LiCF₃SO₃、LiB(CO₂CO₂)₂、LiBF₂(CO₂CO₂)、LiCl、LiN(SO₂CF₂CF₃)₂、LiN(SO₂CF₃)₂And LiN (SO)₂F)₂One or more of (a), also for example LiPF₆。

In one application, the molar concentration of the electrolyte lithium salt in the electrolyte can be the conventional molar concentration in the electrolyte in the field of lithium ion batteries, such as 1 mol/L.

In a certain application scheme, the mass percentage of the compound shown in the formula I in the electrolyte can be the mass percentage of the electrolyte in the battery field (especially in the lithium ion battery field), for example, 0.1% to 5%, and for example, 0.5% to 2%. Those skilled in the art will recognize that the amount of the compound of formula I can be suitably adjusted depending on the compound.

In one embodiment of the application, the electrolyte may be composed of the solvent, the electrolyte lithium salt and the compound of formula I.

The invention also provides application of the compound shown in the formula I in preparation of battery electrolyte.

In one aspect of the application, certain features have the following meanings, and other features have the meanings as described in any of the aspects above (hereinafter referred to as "in one aspect of the application"):

the battery may be a conventional battery such as a lithium battery or a zinc battery. The lithium battery may be a conventional lithium battery, such as a lithium metal battery or a lithium ion battery. The lithium metal battery can be a lithium primary battery or a secondary battery with a negative electrode made of metal lithium. The lithium ion battery can be a lithium ion secondary battery.

In one embodiment, the electrolyte may include a solvent.

In a certain application, when the electrolyte may comprise a solvent, the solvent may be a solvent that is conventional in electrolytes in the battery field (especially in the lithium ion battery field), such as water and/or an organic solvent.

In one embodiment of the application, the organic solvent may be an organic solvent which is conventional in electrolytes for batteries, especially lithium ion batteries, such as dimethyl carbonate (DMC), diethyl carbonate (DEC), Ethylene Carbonate (EC), Propylene Carbonate (PC), 2, 3-butylene carbonate (2,3-BC), 1, 2-butylene carbonate (1,2-BC), 1, 2-pentylene carbonate (PIC), 2-methyl-1, 2-butylene carbonate (i-BC), methylethyl carbonate (EMC), methylpropyl carbonate (MPC), methyl n-butyl carbonate (n-BMC), methyl isobutyl carbonate (i-BMC), 2-butylmethyl carbonate (s-BMC), methylisopropyl carbonate (n-BMC), and mixtures thereof, Butylene carbonate, dibutyl carbonate (DBC), methylbutyl carbonate, fluoroethylene carbonate (FEC), methyl 2,2, 2-trifluoroethyl carbonate (MTFEC), ethyl 2,2, 2-trifluoroethyl carbonate (ETFEC), propyl 2,2, 2-trifluoroethyl carbonate (PTFEC), methyl 2,2,2,2',2',2 '-hexafluoroisopropyl carbonate (MHFPC), ethyl 2,2,2',2',2' -hexafluoroisopropyl carbonate (EHFPC), bis (2,2, 2-trifluoroethyl) carbonate (DTFEC), bis (2,2,3, 3-tetrafluoropropyl) carbonate, bis (2,2,3,3, 3-pentafluoropropyl) carbonate, 1,2, 2-tetrafluoroethyl-2, 2,3, 3-tetrafluoropropyl carbonate, 1,2,2, 2-pentafluoroethyl-2, 2,3,3, 3-pentafluoropropyl carbonate, 4- (2,2,3,3) -tetrafluoropropoxymethyl- [1,3] -dioxolan-2-one, 4- (2,3,3,3) -tetrafluoro-2-trifluoromethyl-propyl- [1,3] -dioxolan-2-one, Methyl Formate (MF), Ethyl Acetate (EA), Methyl Propionate (MP), Ethyl Propionate (EP), Methyl Butyrate (MB), Ethyl Butyrate (EB), Methyl Acetate (MA), cyclobutyrate (γ BL), cypionate (γ VL), azomethyloxazolidinone (NMO), methyl difluoroacetate, methyl trifluoroacetate, ethyl trifluoroacetate, 2,2, 2-trifluoro-N, n-dimethylacetamide (TFECm), 1-trifluoromethyl-N, N-dimethylformamide (Cm HFP), dimethanol formal (DMM), ethylene glycol dimethyl ether (DME), ethylene glycol diethyl ether (DEE), Tetrahydrofuran (THF), 2-methyltetrahydrofuran (2-Me-THF), 1, 3-dioxolane (1,3-DL), 2-methyl-1, 3-dioxolane (2-Me-1,3-DL), 4-methyl-1, 3-dioxolane (4-Me-1,3-DL), 1,2, 2-tetrafluoroethyl-2, 2, 2-trifluoroethyl ether, 1,2, 2-tetrafluoroethyl-2, 2,3, 3-tetrafluoropropyl ether, One or more of methyl nonafluorobutyl ether, Acetonitrile (AN), 3-Methoxypropionitrile (MPN), 3-Ethoxypropionitrile (EPN), 3- (2,2, 2-trifluoroethoxy) propionitrile (EPN), Malononitrile (MAN), Succinonitrile (SCN), Glutaronitrile (GLN), Adiponitrile (ADN), Pimelonitrile (PMN), Suberonitrile (SUN), nonanedionitrile (AZN), Sebaconitrile (SEN), dimethyl methylphosphonate (DMMP), (2-methoxyethoxy) dimethyl methylphosphonate (DMMEMP), (2-methoxyethoxy) diethyl methylphosphonate (DEEMP), methylethylsulfone, sulfolane, dibutylsulfone, ethylvinylsulfone, methylisopropylsulfone, ethylisopropylsulfone, ethylisobutylsulfone, isopropylisobutylsulfone, 2-butylisopropylsulfolane, n-butylisobutylsulfone, and 2-methoxyethylmethylsulfone, for example, a mixed solvent of ethylene carbonate and ethyl methyl carbonate, and for example, "a mixed solvent of ethylene carbonate and ethyl methyl carbonate, the mass ratio of ethylene carbonate to ethyl methyl carbonate is 3: 7".

In one aspect of the application, the electrolyte may include an electrolytic lithium salt.

In one embodiment of the application, the electrolyte lithium salt may be a conventional electrolyte lithium salt in an electrolyte in the field of lithium ion batteries, such as LiPF₆、LiBF₄、LiClO₄、LiAsF₆、LiCF₃SO₃、LiB(CO₂CO₂)₂、LiBF₂(CO₂CO₂)、LiCl、LiN(SO₂CF₂CF₃)₂、LiN(SO₂CF₃)₂And LiN (SO)₂F)₂One or more of (a), also for example LiPF₆。

In one application, the molar concentration of the electrolyte lithium salt in the electrolyte can be the conventional molar concentration in the electrolyte in the field of lithium ion batteries, such as 1 mol/L.

In a certain application scheme, the mass percentage of the compound shown in the formula I in the electrolyte can be the mass percentage of the electrolyte in the battery field (especially in the lithium ion battery field), for example, 0.1% to 5%, and for example, 0.5% to 2%. Those skilled in the art will recognize that the amount of the compound of formula I can be suitably adjusted depending on the compound.

In one embodiment of the application, the electrolyte may be composed of the solvent, the electrolyte lithium salt and the compound of formula I.

The invention also provides a battery electrolyte, which comprises a solvent, an electrolyte and a substance A; the substance A is one or more compounds shown in the formula I.

In one embodiment of the electrolyte, certain features have the following meanings, and other features have the meanings described in any one of the above embodiments (hereinafter, simply referred to as "in one embodiment of the electrolyte"):

the battery may be a conventional battery such as a lithium battery or a zinc battery. The lithium battery may be a conventional lithium battery, such as a lithium metal battery or a lithium ion battery. The lithium metal battery can be a lithium primary battery or a secondary battery with a negative electrode made of metal lithium. The lithium ion battery can be a lithium ion secondary battery.

In one embodiment of the electrolyte, the solvent may be a solvent that is conventional in the electrolyte in the battery field (especially in the lithium ion battery field), such as water and/or an organic solvent.

In one embodiment of the electrolyte, the organic solvent may be an organic solvent that is conventional in the field of battery electrolytes, particularly in the field of lithium ion batteries, such as dimethyl carbonate (DMC), diethyl carbonate (DEC), Ethylene Carbonate (EC), Propylene Carbonate (PC), 2, 3-butylene carbonate (2,3-BC), 1, 2-butylene carbonate (1,2-BC), 1, 2-pentylene carbonate (PIC), 2-methyl-1, 2-butylene carbonate (i-BC), methylethyl carbonate (EMC), methylpropyl carbonate (MPC), methyl n-butyl carbonate (n-BMC), methyl isobutyl carbonate (i-BMC), 2-butylmethyl carbonate (s-BMC), methylisopropyl carbonate (n-BMC), and lithium ion battery electrolytes, Butylene carbonate, dibutyl carbonate (DBC), methylbutyl carbonate, fluoroethylene carbonate (FEC), methyl 2,2, 2-trifluoroethyl carbonate (MTFEC), ethyl 2,2, 2-trifluoroethyl carbonate (ETFEC), propyl 2,2, 2-trifluoroethyl carbonate (PTFEC), methyl 2,2,2,2',2',2 '-hexafluoroisopropyl carbonate (MHFPC), ethyl 2,2,2',2',2' -hexafluoroisopropyl carbonate (EHFPC), bis (2,2, 2-trifluoroethyl) carbonate (DTFEC), bis (2,2,3, 3-tetrafluoropropyl) carbonate, bis (2,2,3,3, 3-pentafluoropropyl) carbonate, 1,2, 2-tetrafluoroethyl-2, 2,3, 3-tetrafluoropropyl carbonate, 1,2,2, 2-pentafluoroethyl-2, 2,3,3, 3-pentafluoropropyl carbonate, 4- (2,2,3,3) -tetrafluoropropoxymethyl- [1,3] -dioxolan-2-one, 4- (2,3,3,3) -tetrafluoro-2-trifluoromethyl-propyl- [1,3] -dioxolan-2-one, Methyl Formate (MF), Ethyl Acetate (EA), Methyl Propionate (MP), Ethyl Propionate (EP), Methyl Butyrate (MB), Ethyl Butyrate (EB), Methyl Acetate (MA), cyclobutyrate (γ BL), cypionate (γ VL), azomethyloxazolidinone (NMO), methyl difluoroacetate, methyl trifluoroacetate, ethyl trifluoroacetate, 2,2, 2-trifluoro-N, n-dimethylacetamide (TFECm), 1-trifluoromethyl-N, N-dimethylformamide (Cm HFP), dimethanol formal (DMM), ethylene glycol dimethyl ether (DME), ethylene glycol diethyl ether (DEE), Tetrahydrofuran (THF), 2-methyltetrahydrofuran (2-Me-THF), 1, 3-dioxolane (1,3-DL), 2-methyl-1, 3-dioxolane (2-Me-1,3-DL), 4-methyl-1, 3-dioxolane (4-Me-1,3-DL), 1,2, 2-tetrafluoroethyl-2, 2, 2-trifluoroethyl ether, 1,2, 2-tetrafluoroethyl-2, 2,3, 3-tetrafluoropropyl ether, One or more of methyl nonafluorobutyl ether, Acetonitrile (AN), 3-Methoxypropionitrile (MPN), 3-Ethoxypropionitrile (EPN), 3- (2,2, 2-trifluoroethoxy) propionitrile (EPN), Malononitrile (MAN), Succinonitrile (SCN), Glutaronitrile (GLN), Adiponitrile (ADN), Pimelonitrile (PMN), Suberonitrile (SUN), nonanedionitrile (AZN), Sebaconitrile (SEN), dimethyl methylphosphonate (DMMP), (2-methoxyethoxy) dimethyl methylphosphonate (DMMEMP), (2-methoxyethoxy) diethyl methylphosphonate (DEEMP), methylethylsulfone, sulfolane, dibutylsulfone, ethylvinylsulfone, methylisopropylsulfone, ethylisopropylsulfone, ethylisobutylsulfone, isopropylisobutylsulfone, 2-butylisopropylsulfolane, n-butylisobutylsulfone, and 2-methoxyethylmethylsulfone, for example, a mixed solvent of ethylene carbonate and ethyl methyl carbonate, and for example, "a mixed solvent of ethylene carbonate and ethyl methyl carbonate, the mass ratio of ethylene carbonate to ethyl methyl carbonate is 3: 7".

In one embodiment of the electrolyte, the electrolyte may be a conventional electrolyte in the field of batteries (especially in the field of lithium ion batteries), such as an electrolytic lithium salt.

In one embodiment of the electrolyte, the electrolyte lithium salt may be a conventional electrolyte lithium salt in an electrolyte in the field of lithium ion batteries, such as LiPF₆、LiBF₄、LiClO₄、LiAsF₆、LiCF₃SO₃、LiB(CO₂CO₂)₂、LiBF₂(CO₂CO₂)、LiCl、LiN(SO₂CF₂CF₃)₂、LiN(SO₂CF₃)₂And LiN (SO)₂F)₂One or more of (a), also for example LiPF₆。

In one embodiment of the electrolyte, the molar concentration of the electrolyte (e.g., electrolyte lithium salt) in the electrolyte may be a molar concentration that is conventional in the electrolyte in the battery field (especially in the lithium ion battery field), such as 1 mol/L.

In one embodiment of the electrolyte, the substance a may be a compound represented by formula I.

In a certain embodiment of the electrolyte, the mass percentage of the substance a in the electrolyte may be a mass percentage that is conventional in the electrolyte in the battery field (especially in the lithium ion battery field), for example, 0.1% to 5%, and for example, 0.5% to 2%. The amount of substance A can be suitably adjusted as the substance A varies, as is known to those skilled in the art.

In a certain scheme of the electrolyte, the solvent can be a mixed solvent of ethylene carbonate and ethyl methyl carbonate, and the mass ratio of the ethylene carbonate to the ethyl methyl carbonate is 3: 7; the electrolyte can be LiPF₆The molar concentration of the electrolyte in the electrolyte can be 1 mol/L; the substance A can be a compound shown in the formula I.

In a certain scheme of the electrolyte, the solvent can be a mixed solvent of ethylene carbonate and ethyl methyl carbonate, and the mass ratio of the ethylene carbonate to the ethyl methyl carbonate is 3: 7; the electrolyte can be LiPF₆The molar concentration of the electrolyte in the electrolyte can be 1 mol/L; the substance A can be

In one embodiment of the electrolyte, the electrolyte may be composed of the solvent, the electrolyte and the substance a.

The present invention also provides a battery, comprising: the battery comprises a shell, and a positive electrode, a negative electrode, a diaphragm and the battery electrolyte which are packaged in the shell.

In one aspect of the battery, certain features have the following meanings, and other features have the meanings described above (hereinafter referred to as "in one aspect of the battery"):

in one aspect of the battery, the positive electrode may include a positive electrode composite including a positive electrode active material, a binder, and a conductive agent, and a current collector.

In one embodiment of the battery, the positive electrode may be composed of the positive electrode composite and the current collector, and the positive electrode composite is bonded to the current collector.

In one aspect of the battery, the positive electrode composite may include a positive electrode active material, a binder, and a conductive agent.

In one embodiment of the battery, the positive active material may be a positive active material that is conventional in the battery field (particularly, in the lithium ion battery field), such as LiCoO₂、LiFePO₄、LiNi_xCo_yAl_1-x-yO₂And LiNi_xCo_yMn_1-x-yO₂Or, LiMn₂O₄、LiNi_0.5Mn_1.5O₄And Li₃V₂(PO₄)₃Wherein x is more than or equal to 0.1, y is more than or equal to 0.1 and less than or equal to 0.8, and x + y is more than or equal to 0.2 and less than or equal to 0.9; and for example LiNi_0.8Co_0.1Mn_0.1O₂Or LiNi_0.5Mn_1.5O₄。

In a certain aspect of the battery, the mass percentage of the positive electrode active material in the positive electrode composite material may be a mass percentage that is conventional in the battery field (especially, in the lithium ion battery field), for example, 80% to 97%, and further, for example, 95%.

In one embodiment of the battery, the conductive agent may be a conductive agent that is conventional in the battery field (particularly in the lithium ion battery field), such as acetylene black.

In a certain aspect of the battery, the mass percentage of the conductive agent in the positive electrode composite material may be a mass percentage that is conventional in the battery field (especially, the lithium ion battery field), for example, 1.5% to 10%, and for example, 2.5%.

In one embodiment of the battery, the binder can be a binder that is conventional in the field of batteries, in particular lithium ion batteries, such as polyvinylidene fluoride, for example, and also such asHSV 900 orPVDF。

In a certain aspect of the battery, the mass percentage of the binder in the positive electrode composite material may be a mass percentage that is conventional in the battery field (especially, the lithium ion battery field), for example, 1.5% to 10%, and for example, 2.5%.

In one embodiment of the battery, the mass ratio of the conductive agent to the binder may be 1: 1.

in one embodiment of the battery, the current collector may be a current collector conventional in the battery field (especially in the lithium ion battery field), such as an aluminum foil.

In one embodiment of the battery, the separator may be a polypropylene separator or a polypropylene separator2400 polypropylene separator.

In one embodiment of the battery, the negative electrode may be (1) metallic lithium, (2) an alloy containing lithium, or (3) a negative electrode composite including a negative electrode active material, a binder, and a conductive agent, and a current collector.

In one embodiment of the battery, the negative electrode composite may be composed of the negative electrode active material, the binder, and the conductive agent.

In a certain embodiment of the battery, the negative active material may be a negative active material conventional in the battery field (especially, in the lithium ion battery field), such as graphite, a silicon-carbon composite material, mesocarbon microbeads, graphene or lithium titanate.

In one embodiment of the battery, the current collector may be a current collector conventional in the battery field (especially in the lithium ion battery field), such as an aluminum foil.

The invention also provides a fluorine-containing compound shown as a formula II;

wherein R is¹、R²、R³、R⁴And R⁵Independently H, F, Cl, Br, I, "C₁-C₂₀Straight or branched alkyl of (2), (halogen-substituted C)₁-C₂₀Straight or branched alkyl of (2), "heteroatom-containing C₁-C₂₀The heteroatom is one or more of S, O, N, Si, P and B, and the "halogen-substituted heteroatom-containing C₁-C₂₀The heteroatom is one or more of S, O, N, Si, P and B, and the heteroatom is C₆-C₂₀Aryl of (2), "halogen-substituted C₆-C₂₀Aryl of (2), "" C₄-C₂₀Wherein the heteroatom is one or more of S, O, N, Si, P and B or "halogen-substituted C₄-C₂₀Wherein the heteroatom is one or more of S, O, N, Si, P and B ";

and R is¹、R²、R³、R⁴And R⁵At least one of which is F;

x is absent (meaning R^XAnd a benzene ring through C^Sp2-C^Sp2Connected with a key), "C₁-C₂₀Straight or branched alkylene of (2), (halogen-substituted C)₁-C₂₀Straight or branched alkylene of (2), "" heteroatom-containing C₁-C₂₀The heteroatom is one or more of S, O, N, Si, P and B, or the' halogen substituted heteroatom-containing C₁-C₂₀Linear or branched alkylene with heteroatoms of one or more of S, O, N, Si, P and B ";

R^Xis "C₆-C₂₀Aryl of (2), "" R "^X-1Substituted C₆-C₂₀Aryl of (2), "" C₄-C₂₀Wherein the heteroatom is one or more of S, O, N, Si, P and B or R^X-2Substituted C₄-C₂₀Wherein the heteroatom is one or more of S, O, N, Si, P and B ";

R^X-1and R^X-2Independently F, Cl, Br, I, "C₁-C₂₀Straight or branched alkyl of (2), (halogen-substituted C)₁-C₂₀Straight or branched alkyl of (2), "heteroatom-containing C₁-C₂₀The heteroatom is one or more of S, O, N, Si, P and B, or' halogen substituted, heteroatom-containing C₁-C₂₀The heteroatom is one or more of S, O, N, Si, P and B;

but the fluorine-containing compound represented by the formula II is not the following compound:

in one embodiment of the fluorochemical compound of formula II, certain groups of the fluorochemical compound have the following definitions and other groups have the definitions set forth in any of the above (hereinafter referred to as "in one embodiment of the fluorochemical compound of formula II"):

R¹、R²、R³、R⁴and R⁵May be F.

In one embodiment of the fluorochemical compound of formula II, X can be absent, "C₁-C₂₀Or "C containing hetero atoms₁-C₂₀The heteroatom is one or more of S, O, N, Si, P and B ".

In one embodiment of the fluorochemical compound of formula II, X can be absent or "C₁-C₂₀Linear or branched alkylene groups of ".

In one embodiment of the fluorochemical compound of formula II, X can be absent or "C₁-C₄Linear or branched alkylene groups of ".

In one embodiment of the fluorochemical compound of formula II, X can be either nothing or CH₂。

In one embodiment of the fluorochemical compound of formula II, R^XCan be "C₆-C₁₄Aryl of or^X-1Substituted C₆-C₁₄An aryl group of (1).

In one embodiment of the fluorochemical compound of formula II, R^XCan be "C₆-C₁₀Aryl of or^X-1Substituted C₆-C₁₀An aryl group of (1).

In one embodiment of the fluorochemical compound of formula II, R^XCan be R^X-1Substituted phenyl or naphthyl.

In one embodiment of the fluorochemical compound of formula II, R^X-1And R^X-2May independently be "C₁-C₂₀Straight or branched alkyl of (2), (halogen-substituted C)₁-C₂₀Straight or branched alkyl of (2), "heteroatom-containing C₁-C₂₀The hetero atom is one or more of S, O, N, Si, P and B, or the hetero atom is' halogen substituted, containingC of a hetero atom₁-C₂₀The heteroatom is one or more of S, O, N, Si, P and B ".

In one embodiment of the fluorochemical compound of formula II, R^X-1May independently be "C₁-C₂₀Linear or branched alkoxy ", or" halogen-substituted C₁-C₂₀Linear or branched alkyl groups of ".

In one embodiment of the fluorochemical compound of formula II, R^X-1May independently be "C₁-C₄Linear or branched alkoxy ", or" halogen-substituted C₁-C₄Linear or branched alkyl groups of ".

In one embodiment of the fluorochemical compound of formula II, X can be "C₁-C₂₀Straight or branched alkylene of (2), (halogen-substituted C)₁-C₂₀Straight or branched alkylene of (2), "" heteroatom-containing C₁-C₂₀The heteroatom is one or more of S, O, N, Si, P and B, or the' halogen substituted heteroatom-containing C₁-C₂₀The heteroatom is one or more of S, O, N, Si, P and B ".

In one embodiment of the fluorochemical compound of formula II, X can be "C₁-C₂₀Linear or branched alkylene groups of ".

In one embodiment of the fluorochemical of formula II, X can be methylene.

In one embodiment of the fluorochemical compound of formula II:

R¹、R²、R³、R⁴and R⁵Can be F;

x can be nothing, "C₁-C₂₀Or "C containing hetero atoms₁-C₂₀Linear or branched alkylene with heteroatoms of one or more of S, O, N, Si, P and B ";

R^Xcan be "C₆-C₂₀Aryl of (2), "" R "^X-1Substituted C₆-C₂₀Aryl of (2), "" C₄-C₂₀Wherein the heteroatom is one or more of S, O, N, Si, P and B or R^X-2Substituted C₄-C₂₀Wherein the heteroatom is one or more of S, O, N, Si, P and B ";

R^X-1and R^X-2May independently be "C₁-C₂₀Straight or branched alkyl of (2), (halogen-substituted C)₁-C₂₀Straight or branched alkyl of (2), "heteroatom-containing C₁-C₂₀The heteroatom is one or more of S, O, N, Si, P and B, or' halogen substituted, heteroatom-containing C₁-C₂₀The heteroatom is one or more of S, O, N, Si, P and B ".

In one embodiment of the fluorochemical compound of formula II, the compound of formula II can be a compound of formula II-D or formula II-E:

formula II-D:

formula II-E:

wherein R is⁶、R⁷、R⁸、R⁹、R¹⁰、R¹¹、R¹³And R¹⁴Independently is H or R^X-1。

In one embodiment of the fluorochemical of formula II, the compound of formula II-D can be a compound of formula II-A, formula II-B, or formula II-C:

formula II-A:

formula II-B:

formula II-C:

in one embodiment of the fluorochemical compound of formula II:

R¹、R²、R³、R⁴and R⁵Can be F;

x may be absent or "C₁-C₂₀Linear or branched alkylene groups of ";

R^Xcan be "C₆-C₁₄Aryl of or^X-1Substituted C₆-C₁₄Aryl of (a);

R^X-1may independently be "C₁-C₂₀Linear or branched alkoxy ", or" halogen-substituted C₁-C₂₀Linear or branched alkyl groups of ".

In one embodiment of the fluorochemical compound of formula II:

R¹、R²、R³、R⁴and R⁵Can be F;

x may be absent or "C₁-C₄Linear or branched alkylene groups of ";

R^Xcan be "C₆-C₁₀Aryl of or^X-1Substituted C₆-C₁₀Aryl of (a);

R^X-1may independently be "C₁-C₄Linear or branched alkoxy ", or" halogen-substituted C₁-C₄Linear or branched alkyl groups of ".

In one embodiment of the fluorochemical compound of formula II, when R is¹、R²、R³、R⁴And R⁵Independently halogen substituted C₁-C₂₀When the alkyl group is a straight or branched alkyl group, said "C" is₁-C₂₀The linear or branched alkyl group of "may be" C₁-C₄Linear or branched alkyl "of (2), and (3) may also beMethyl, ethyl, n-propyl, isopropyl, n-butyl, sec-butyl, isobutyl or tert-butyl, and also methyl.

In one embodiment of the fluorochemical compound of formula II, when R is¹、R²、R³、R⁴And R⁵Independently halogen substituted C₁-C₂₀When the alkyl group is a straight chain or branched chain alkyl group, the halogen may be F, Cl, Br or I.

In one embodiment of the fluorochemical compound of formula II, when R is¹、R²、R³、R⁴And R⁵Independently halogen substituted C₁-C₂₀In the case of the straight-chain or branched alkyl group of (2), the number of the halogen is at least one, and may be 1,2 or 3.

In one embodiment of the fluorochemical compound of formula II, when R is¹、R²、R³、R⁴And R⁵Independently halogen substituted C₁-C₂₀When the alkyl group is a straight or branched alkyl group, said halogen is substituted by C₁-C₂₀The linear or branched alkyl group of (a) is a trifluoromethyl group.

In one embodiment of the fluorochemical compound of formula II, when R is¹、R²、R³、R⁴And R⁵Independently is "halogen-substituted, heteroatom-containing C₁-C₂₀When the heteroatom is one or more of S, O, N, Si, P and B, the 'C' is₁-C₂₀The linear or branched alkyl group of "may be" C₁-C₄The straight-chain or branched alkyl group "of (a) may be, in turn, methyl, ethyl, n-propyl, isopropyl, n-butyl, sec-butyl, isobutyl or tert-butyl, and may also be methyl.

In one embodiment of the fluorochemical compound of formula II, when R is¹、R²、R³、R⁴And R⁵Independently is "halogen-substituted, heteroatom-containing C₁-C₂₀When the heteroatom is one or more of S, O, N, Si, P and B, the halogen can be F, Cl, Br or I。

In one embodiment of the fluorochemical compound of formula II, when R is¹、R²、R³、R⁴And R⁵Independently is "halogen-substituted, heteroatom-containing C₁-C₂₀When the heteroatom is one or more of S, O, N, Si, P and B ", the number of the halogen is at least one, and can be 1,2 or 3.

In one embodiment of the fluorochemical compound of formula II, when R is¹、R²、R³、R⁴And R⁵Independently is "halogen-substituted, heteroatom-containing C₁-C₂₀When the heteroatom is one or more of S, O, N, Si, P and B ", the number of the heteroatoms may be 1,2 or 3.

In one embodiment of the fluorochemical compound of formula II, when R is¹、R²、R³、R⁴And R⁵Independently is "halogen-substituted, heteroatom-containing C₁-C₂₀When the heteroatom is one or more of S, O, N, Si, P and B, "the heteroatom may be one or more of S, O and N.

In one embodiment of the fluorochemical compound of formula II, when X is C₁-C₂₀When the alkylene group is a straight chain or branched chain alkylene group, the "C" is₁-C₂₀The straight-chain or branched alkylene group of "may be" C₁-C₄The linear or branched alkylene group "of (a) may be a methylene group or an ethylene group, and may be a methylene group.

In one embodiment of the fluorochemical compound of formula II, when X is halogen substituted C₁-C₂₀When the alkylene group is a straight chain or branched chain alkylene group, the "C" is₁-C₂₀The straight-chain or branched alkylene group of "may be" C₁-C₄The linear or branched alkylene group "of (a) may be a methylene group or an ethylene group, and may be a methylene group.

In one embodiment of the fluorochemical compound of formula II, when X is halogen substituted C₁-C₂₀When the alkylene group is a straight chain or branched chain alkylene group, the halogen may be F, Cl, Br or I.

In one embodiment of the fluorochemical compound of formula II, when X is halogen substituted C₁-C₂₀In the case of the straight-chain or branched alkylene group(s), the number of the halogen(s) is at least one, and may be 1,2 or 3.

In one embodiment of the fluorochemical compound of formula II, when X is "C containing a heteroatom₁-C₂₀When the hetero atom is one or more of S, O, N, Si, P and B, the "C" is₁-C₂₀The straight-chain or branched alkylene group of "may be" C₁-C₄The linear or branched alkylene group "of (a) may be a methylene group or an ethylene group, and may be a methylene group.

In one embodiment of the fluorochemical compound of formula II, when X is "C containing a heteroatom₁-C₂₀When the heteroatom is one or more of S, O, N, Si, P and B ", the number of said heteroatom may be 1,2 or 3.

In one embodiment of the fluorochemical compound of formula II, when X is "C containing a heteroatom₁-C₂₀When the heteroatom is one or more of S, O, N, Si, P and B ", the heteroatom may be one or more of S, O and N.

In one embodiment of the fluorochemical compound of formula II, when X is "halogen-substituted, heteroatom-containing C₁-C₂₀When the hetero atom is one or more of S, O, N, Si, P and B, the "C" is₁-C₂₀The straight-chain or branched alkylene group of "may be" C₁-C₄The linear or branched alkylene group "of (a) may be a methylene group or an ethylene group, and may be a methylene group.

In one embodiment of the fluorochemical compound of formula II, when X is "halogen-substituted, heteroatom-containing C₁-C₂₀The hetero atom is one or more of S, O, N, Si, P and B"the halogen may be F, Cl, Br or I.

In one embodiment of the fluorochemical compound of formula II, when X is "halogen-substituted, heteroatom-containing C₁-C₂₀When the heteroatom is one or more of S, O, N, Si, P and B ", the number of said halogen is at least one, and may be 1,2 or 3.

In one embodiment of the fluorochemical compound of formula II, when X is "halogen-substituted, heteroatom-containing C₁-C₂₀When the heteroatom is one or more of S, O, N, Si, P and B ", the number of said heteroatom may be 1,2 or 3.

In one embodiment of the fluorochemical compound of formula II, when X is "halogen-substituted, heteroatom-containing C₁-C₂₀When the heteroatom is one or more of S, O, N, Si, P and B ", the heteroatom may be one or more of S, O and N.

In one embodiment of the fluorochemical compound of formula II, when R is^XIs C₆-C₂₀Aryl of (2), said C₆-C₂₀Aryl of (A) may be C₆-C₁₄Aryl of (a) may also be C₆-C₁₀The aryl group of (a) may also be phenyl or naphthyl, more preferably phenyl, naphthalen-1-yl, or naphthalen-2-yl.

In one embodiment of the fluorochemical compound of formula II, when R is^XIs R^X-1Substituted C₆-C₂₀Aryl of (2), said C₆-C₂₀Aryl of (A) may be C₆-C₁₄Aryl of (a) may also be C₆-C₁₀The aryl group of (a) may also be phenyl or naphthyl, more preferably phenyl, naphthalen-1-yl, or naphthalen-2-yl.

In one embodiment of the fluorochemical compound of formula II, when R is^XIs R^X-1Substituted C₆-C₂₀When aryl of (A) is said R^X-1The number of (a) may be 1,2 or 3, and may be 1 or 2.

In one embodiment of the fluorochemical compound of formula II, when R is^XIs R^X-1Substituted C₆-C₂₀When aryl of (A) is said R^XAnd X can be independently ortho, meta or para to each other, and can be independently meta or para to each other.

In one embodiment of the fluorochemical compound of formula II, when R is^XIs R^X-1Substituted C₆-C₂₀When aryl of (A) is said R^X-1The number of (A) can be 1, C₆-C₂₀The aryl group of (A) may be phenyl, said R being^XAnd the X is meta or para.

In one embodiment of the fluorochemical compound of formula II, when R is^XIs R^X-1Substituted C₆-C₂₀When aryl of (A) is said R^X-1The number of (2) can be provided, C₆-C₂₀The aryl group of (A) may be phenyl, said R being^XAnd the position of the X is meta.

In one embodiment of the fluorochemical compound of formula II, when R is^X-1Independently is "heteroatom containing C₁-C₂₀When the heteroatom is one or more of S, O, N, Si, P and B, the 'heteroatom-containing C' is₁-C₂₀Is one or more of S, O, N, Si, P and B, and can be C₁-C₂₀The linear or branched alkoxy group of (b) may also be "C₁-C₄The straight-chain or branched alkoxy group "of (a) may also be methoxy, ethoxy, n-propoxy, isopropoxy, n-butoxy, sec-butoxy, isobutoxy or tert-butoxy, more preferably methoxy.

In one embodiment of the fluorochemical compound of formula II, when R is^X-1Independently halogen substituted C₁-C₂₀When the alkyl group is a straight or branched alkyl group, said "C" is₁-C₂₀The linear or branched alkyl group of "may be" C₁-C₄The straight-chain or branched alkyl groups "of (A) may in turn be methyl, ethyl, n-propyl, isopropyl, n-butyl, sec-butyl, isobutylOr tert-butyl, and may also be methyl.

In one embodiment of the fluorochemical compound of formula II, when R is^X-1Independently halogen substituted C₁-C₂₀When the alkyl group is a straight chain or branched chain alkyl group, the halogen may be F, Cl, Br or I.

In one embodiment of the fluorochemical compound of formula II, when R is^X-1Independently halogen substituted C₁-C₂₀In the case of the straight-chain or branched alkyl group of (2), the number of the halogen is at least one, and may be 1,2 or 3.

In one embodiment of the fluorochemical compound of formula II, when R is^X-1Independently halogen substituted C₁-C₂₀When the alkyl group is a straight or branched alkyl group, said halogen is substituted by C₁-C₂₀The linear or branched alkyl group of (a) is a trifluoromethyl group.

In one embodiment of the fluorochemical compound of formula II, when R is^X-1Independently is "halogen-substituted, heteroatom-containing C₁-C₂₀When the heteroatom is one or more of S, O, N, Si, P and B, the 'C' is₁-C₂₀The linear or branched alkyl group of "may be" C₁-C₄The straight-chain or branched alkyl group "of (a) may be, in turn, methyl, ethyl, n-propyl, isopropyl, n-butyl, sec-butyl, isobutyl or tert-butyl, and may also be methyl.

In one embodiment of the fluorochemical compound of formula II, when R is^X-1Independently is "halogen-substituted, heteroatom-containing C₁-C₂₀When the heteroatom is one or more of S, O, N, Si, P and B ", the halogen can be F, Cl, Br or I.

In one embodiment of the fluorochemical compound of formula II, when R is^X-1Independently is "halogen-substituted, heteroatom-containing C₁-C₂₀When the heteroatom is one or more of S, O, N, Si, P and B ", the number of the halogen is at least one, and can be 1,2 or 3.

In one embodiment of the fluorochemical of formula II, the halogen can be F, Cl, Br, or I.

In one embodiment of the fluorine-containing compound of formula II, the fluorine-containing compound of formula II may be

Unless otherwise specified, the terms in the present application have the following meanings:

when any variable (e.g. R)^X-1) In the definition of a compound, the occurrence at each position of the variable is defined multiple times independently of the occurrence at the remaining positions, and their meanings are independent of each other and independent of each other. Thus, if a group is substituted by 1,2 or 3R^X-1Substituted by radicals, i.e. the radical may be substituted by up to 3R^X-1Substituted, in a certain position R^X-1Is defined by the definition of (1) and the remaining positions R^X-1Are defined independently of each other.

The term "alkyl" refers to a straight or branched chain alkyl group having the indicated number of carbon atoms. Examples of alkyl groups include, but are not limited to, methyl, ethyl, n-propyl, isopropyl, n-butyl, tert-butyl, isobutyl, sec-butyl, n-pentyl, n-hexyl, n-heptyl, n-octyl, and the like.

The term "heteroatom-containing alkyl" refers to the insertion of a heteroatom in the middle and/or at the end of the "alkyl" described above. The heteroatom may be one or more of S, O, N, Si, P and B. The heteroatom is bonded to other atoms by single bonds. For example alkoxy groups.

The term "aryl" refers to an aromatic group consisting only of carbon atoms, which may be monocyclic or fused polycyclic. When it is a fused polycyclic ring, each ring has aromaticity. Examples of aryl groups include, but are not limited to, phenyl, naphthyl, and the like.

The term "heteroaryl" refers to an aromatic group comprising carbon atoms and heteroatoms, which may be one or more of S, O, N, Si, P and B, and the number of heteroatoms may be 1,2 or 3. It may be monocyclic (e.g., a 5-6 membered monocyclic ring) or fused polycyclic (e.g., a 9-10 membered bicyclic ring). When it is a fused polycyclic ring, each ring has aromaticity. Examples of heteroaryl groups include, but are not limited to, furyl, pyridyl, pyridazinyl, pyrimidinyl, pyrazinyl, thienyl, isoxazolyl, oxazolyl, oxadiazolyl, imidazolyl, pyrrolyl, pyrazolyl, triazolyl, tetrazolyl, thiazolyl, isothiazolyl, thiadiazolyl, benzimidazolyl, indolyl, indazolyl, benzothiazolyl, benzisothiazolyl, benzoxazolyl, benzisoxazolyl, quinolinyl, isoquinolinyl, and the like.

The above preferred conditions can be arbitrarily combined to obtain preferred embodiments of the present invention without departing from the common general knowledge in the art.

The reagents and starting materials used in the present invention are commercially available.

The positive progress effects of the invention are as follows: the fluorine-containing compound reduces the irreversible capacity loss of the lithium ion battery, obviously improves the discharge capacity, the working voltage, the cycle life and the cycle stability of the lithium ion battery on the basis of controlling the commercial cost, can be quickly applied in the commercial development, and effectively controls the commercial cost.

Drawings

FIG. 1 is a graph comparing the charge-discharge specific capacities at 1C current for a long cycle in example 1 and control 1.

FIG. 2 is a graph comparing the charge-discharge specific capacities at 1C current for a long cycle in example 2 and control 1.

FIG. 3 is a graph comparing the charge-discharge specific capacities at 1C current for a long cycle in example 3 and control 1.

FIG. 4 is a graph comparing the charge-discharge specific capacities at 1C current for a long cycle in example 4 and control 1.

FIG. 5 is a graph comparing the charge-discharge specific capacities at 1C current for a long cycle in example 5 and control 1.

FIG. 6 is a graph comparing the specific discharge capacity at 0.5C charge and 1C discharge cycles of example 1 and control 1.

FIG. 7 is a graph comparing the specific discharge capacity at 0.5C charge and 1C discharge cycles of example 2 and control 1.

FIG. 8 is a graph comparing the specific discharge capacity at 0.5C charge and 1C discharge cycles of example 3 and control 1.

FIG. 9 is a graph comparing the specific discharge capacity at 0.5C charge and 1C discharge cycles of example 6 and control 1.

FIG. 10 is a graph comparing the specific discharge capacity at 1C for long cycle at current of example 7 and comparative example 2.

FIG. 11 is a graph comparing the specific discharge capacity at 1C for long cycle at current of example 8 and comparative example 2.

Detailed Description

The invention is further illustrated by the following examples, which are not intended to limit the scope of the invention. The experimental methods without specifying specific conditions in the following examples were selected according to the conventional methods and conditions, or according to the commercial instructions.

Preparation example 1: the benzylation synthesis method of pentafluorobenzene by copper catalysis comprises the following steps:

to a 50mL Schlenk reaction flask blanketed with anhydrous and oxygen-free argon, was added sequentially cuprous iodide (0.4mmol,0.076g),1, 10-phenanthroline (0.4mmol,720mg), potassium phosphate (6mmol,1.28g), 2-chloromethyl-6-methoxynaphthalene (2.0mmol,0.413g), and pentafluorobenzene (4mmol,0.45mL), and finally freshly distilled anhydrous xylene (4mL) and anhydrous DMF (4 mL). The reaction mixture was heated to 140 ℃ and stirred for 6 hours. Then, the mixture was cooled to room temperature, concentrated under reduced pressure, and the resulting solid was diluted with 100mL of ethyl acetate and washed with an appropriate amount of saturated brine. The organic phase was dried over anhydrous magnesium sulfate, filtered and concentrated. Purification by column chromatography on silica gel (eluent petroleum ether: ethyl acetate 100:1) gave 256mg of the expected product as a white solid in 38% yield.

Example 1

The first step is as follows: preparation of electrolyte containing additive

Mixing Ethylene Carbonate (EC) and Ethyl Methyl Carbonate (EMC) according to the mass ratio of 3:7, and adding LiPF into the mixed solvent₆Make LiPF₆Has a concentration of 1 mol. L^-1Thus, a base liquid of the electrolyte solution used in the present example was obtained. The base electrolyte of this example was charged with a mixture containing fluorophenylationCompound 2,3,4,5, 6-pentafluoro-3 ',5' -bis (trifluoromethyl) -1,1' -biphenyl as electrolyte additive T₁The molecular structure is shown as follows:

the mass percentage of the additive in the electrolyte is 2%, and the additive is stirred for 1-5h after being stirred and completely dissolved, so that the electrolyte containing the additive is obtained.

The second step is that: preparation of positive plate

Mixing a positive electrode active material (80 wt%), a conductive agent acetylene black (10 wt%), a conductive agent polyvinylidene fluoride (PVDF)HSV 900 orPVDF, 10 wt%) is uniformly dispersed in N-methylpyrrolidone (NMP, 250 wt%) to prepare positive electrode slurry. Uniformly coating the slurry on an aluminum foil by using a scraper of 100 mu m, heating at 100 ℃ for 10h, drying, rolling to a proper compaction density by using a double-roller machine, punching to form a pole piece with the diameter of 14mm, weighing, heating at 120 ℃ under a vacuum condition for 10h, drying again, and directly transferring to a glove box for later use. The positive electrode active material in this example was LiNi_0.8Co_0.1Mn_0.1O₂。

The third step: preparation of the Battery

The prepared pole piece is placed in a positive pole shell, and a lithium metal piece with the thickness of 0.02-0.45mm and the diameter of 15.6mm is used as a negative pole. With a diameter of 19mm between the positive and negative electrodes2400 polypropylene separators were separated and thoroughly infiltrated with 20-50 μ L of electrolyte containing additives. And then respectively placing the gasket, the elastic sheet and the negative electrode shell, and packaging by using a Kejing MSK-E110 battery packaging machine to assemble the CR2032 button type lithium ion battery. Standing the battery in a glove box for 12-24 h, and then performing electrochemistryAnd (6) testing.

Example 2

An electrolyte and a lithium ion battery were produced in the same manner as in example 1, except that a fluorine-containing phenyl compound 2,3,4,5, 6-pentafluoro-4 '-trifluoromethyl-1, 1' -biphenyl was added as an electrolyte additive T to the electrolyte base liquid in this example₂The molecular structure is shown as follows:

the mass percentage of the additive in the electrolyte is 2%.

Example 3

An electrolyte and a lithium ion battery were produced in the same manner as in example 1, except that a fluorine-containing phenyl compound 2,3,4,5, 6-pentafluoro-3 '-trifluoromethyl-1, 1' -biphenyl was added as an electrolyte additive T to the electrolyte base liquid in this example₃The molecular structure is shown as follows:

the mass percentage of the additive in the electrolyte is 2%.

Example 4

An electrolyte and a lithium ion battery were produced in the same manner as in example 1, except that 2-methoxy-6- (perfluorophenyl) naphthalene, a fluorine-containing phenyl compound, was added as an electrolyte additive T to the electrolyte base liquid in this example₄The molecular structure is shown as follows:

except that the additive accounts for 0.5 percent of the electrolyte by mass.

Example 5

An electrolyte and a lithium ion battery were prepared in the same manner as in example 1, except that electrolysis was performed in this exampleAdding a fluorine-containing phenyl compound 2-methoxy-6- ((perfluorophenyl) methyl) naphthalene into liquid base liquid as an electrolyte additive T₅The molecular structure is shown as follows:

except that the additive accounts for 0.5 percent of the electrolyte by mass.

Example 6

An electrolyte and a lithium ion battery were produced in the same manner as in example 1, except that a fluorine-containing phenyl compound 2,3,4,5, 6-pentafluoro-1, 1' -biphenyl was added as an electrolyte additive T to the electrolyte base liquid in this example₆The molecular structure is shown as follows:

except that the additive accounts for 2 percent of the electrolyte by mass.

Example 7

An electrolyte and a lithium ion battery were produced in the same manner as in example 1, except that a fluorine-containing phenyl compound 2,3,4,5, 6-pentafluoro-4 '-trifluoromethyl-1, 1' -biphenyl was added as an electrolyte additive T to the electrolyte base liquid in this example₂The mass percentage of the additive in the electrolyte is 2 percent; except that the positive electrode active material of this example was spinel LiNi_0.5Mn_1.5O₄。

Example 8

An electrolyte and a lithium ion battery were produced in the same manner as in example 1, except that a fluorine-containing phenyl compound 2,3,4,5, 6-pentafluoro-4 '-trifluoromethyl-1, 1' -biphenyl was added as an electrolyte additive T to the electrolyte base liquid in this example₂(ii) a The difference is that the mass percentage of the additive in the electrolyte is 0.5 percent; except that the positive electrode active material of this example was spinel LiNi_0.5Mn_1.5O₄。

Control group 1

An electrolyte and a lithium ion battery were prepared in the same manner as in example 1, except that the electrolyte used was an electrolyte base solution, i.e., the electrolyte contained no additive, and only Ethylene Carbonate (EC) and Ethyl Methyl Carbonate (EMC) were mixed in a mass ratio of 3:7, and LiPF was added to the mixed solvent₆Make LiPF₆Has a concentration of 1 mol. L^-1This was used as control 1.

Control group 2

An electrolyte and a lithium ion battery were prepared in the same manner as in control 1, except that the positive active material of the control was spinel LiNi_0.5Mn_1.5O₄Thus, control 2 was obtained.

Effect test example Battery Performance test

1. LiNi containing additive in electrolyte_0.8Co_0.1Mn_0.1O₂Testing of long cycle Performance of Charge and discharge

The batteries of the above examples 1-5 and the control group 1 were subjected to a charge-discharge long cycle test, with a test voltage range of 3-4.3V, a test current set at 0.1C for 1 cycle of charge-discharge, 0.2C for 5 cycles of charge-discharge, 0.5C for 10 cycles of charge-discharge, and finally 1C for 400 long cycle tests of charge-discharge. See in particular fig. 1-5.

The 1C charge-discharge test specific discharge capacity data records are shown in table 1 below, where the initial capacity is the average of the specific discharge capacities of the first 10 cycles when the 1C current starts to charge and discharge, the residual capacity is the average of the specific discharge capacities of the last 10 cycles, and the capacity retention rate indicates the ratio of the residual capacity of the 1C cycle to the initial capacity under the cycle condition.

TABLE 1

The batteries of the above examples 1-3, 6 and the control 1 were charged and discharged at 0.2C for 2 cycles, then charged at 0.5C and discharged at 1C for 300 cycles, and the test voltage range was 3-4.3V. See in particular fig. 6-9.

The data records of the test stages of 0.5C charge and 1C discharge are shown in table 2 below. Wherein the initial capacity is the first-turn specific discharge capacity under the condition of 0.5C charging and 1C discharging circulation, the residual capacity is the specific discharge capacity of the last circulation, and the capacity retention rate represents the ratio of the residual capacity to the initial capacity under the condition of the circulation.

TABLE 2

Sample (I)	Initial capacity (mAh. g)-1)	Residual capacity (mAh. g)-1)	Capacity retention rate
				Control group 1	164.39	109.42	66.56％
Example 1	166.15	147.09	88.53％
				Example 2	163.44	151.04	92.41％
Example 3	177.52	154.51	87.04％
				Example 6	171.59	144.33	84.11％

2. LiNi containing additive in electrolyte_0.5Mn_1.5O₄Testing of long cycle performance of battery

The batteries obtained in the above examples 7 and 8 and the control group 2 were subjected to a long cycle test at a test voltage of 3.5-4.95V. The test scheme is that the charge and discharge are carried out for 5 times of cycles at 0.2C, then the charge and discharge are carried out for 10 times of cycles at 0.5C, and finally the charge and discharge are carried out for 500 times of long cycle test at 1C. See in particular fig. 10 and 11.

The 1C charge-discharge test specific discharge capacity data records are shown in table 3 below, where the initial capacity is the average of the specific discharge capacities of the first 10 cycles when the 1C current starts to charge and discharge, the residual capacity is the average of the specific discharge capacities of the last 10 cycles, and the capacity retention rate indicates the ratio of the residual capacity of the 1C cycle to the initial capacity under the cycle condition.

TABLE 3

Sample (I)	Initial capacity (mAh. g)-1)	Residual capacity (mAh. g)-1)	Capacity retention rate
				Control group 2	106.00	69.03	65.12％
Example 7	111.88	98.06	87.64％
				Example 8	84.29	79.35	94.14％

In the electrochemical impedance test after the long-cycle performance test of the batteries obtained in examples 7 and 8 and the control group 2 was completed, the control voltage was the open-circuit voltage of the battery, the sweep frequency range was set to 100 kHz-0.01 Hz, and the AC amplitude was 5 mV. Contact resistance (R) after equivalent circuit fitting of measured cell electrochemical impedance data_Ω) And a charge transfer resistance (R)_ct) As shown in table 4 below.

TABLE 4

Sample (I)	RΩ(Ω)	Rct(Ω)
			Control group 2	9.5	1622
Example 7	33.0	378
			Example 8	6.0	552