阅读说明：本技术 一种无钴锂电池用MOFs基前驱体、正极材料及其制备方法 (MOFs-based precursor for cobalt-free lithium battery, positive electrode material and preparation method of MOFs-based precursor ) 是由 许开华 张坤 薛晓斐 李聪 陈康 黎俊 孙海波 范亮姣 杨幸 于 2020-12-15 设计创作，主要内容包括：本发明公开了一种无钴锂电池用MOFs基前驱体,前驱体的结构式为NixMnyAl1-x-y-MOFs,前驱体的内核为镍锰-MOFs材料,其中,Ni占内核总金属的摩尔百分比为10-90％,Mn占内核总金属的摩尔百分比为10-80％；所述前驱体的外壳为镍铝-MOFs材料,其中,Ni占外壳中总金属的摩尔百分比为70％-99％,铝占外壳总金属的摩尔百分比为1-30％。本发明形成的MOF基前驱体,在低温预烧时有机物生成挥发气体,最终导致材料形成多孔结构,有利于Li的脱嵌,降低烧结温度,可以提高循环过程中的倍率性能,具有很好的发展前景。(The invention discloses an MOFs-based precursor for a cobalt-free lithium battery, wherein the structural formula of the precursor is NixMnyAl1-x-y-MOFs, and the inner core of the precursor is a nickel-manganese-MOFs material, wherein the mole percentage of Ni in the total metals of the inner core is 10-90%, and the mole percentage of Mn in the total metals of the inner core is 10-80%; the shell of the precursor is made of nickel aluminum-MOFs materials, wherein the mole percentage of Ni in the total metal in the shell is 70-99%, and the mole percentage of aluminum in the total metal in the shell is 1-30%. The MOF-based precursor formed by the invention generates volatile gas from organic matters during low-temperature presintering, finally leads the material to form a porous structure, is beneficial to Li extraction, reduces sintering temperature, can improve rate capability in a circulating process, and has good development prospect.)

1. An MOFs-based precursor for a cobalt-free lithium battery is characterized in that the physical structure of the precursor is a core-shell structure; the structural formula of the precursor is Ni_xMn_yAl_1-x-y-MOFs, wherein 0.1 ≦ x ≦ 0.9, 0.1 ≦ y ≦ 0.5; the inner core of the precursor is a nickel manganese-MOFs material, wherein Ni accounts for 10-90 mol% of total metals of the inner core, and Mn accounts for 10-80 mol% of the total metals of the inner core; the precursor isThe shell is made of nickel aluminum-MOFs materials, wherein the mole percentage of Ni in the total metal in the shell is 70-99%, and the mole percentage of aluminum in the total metal in the shell is 1-30%.

2. A method for preparing the precursor according to claim 1, comprising:

(1) nickel salt and manganese salt are mixed according to the molar ratio of Ni to Mn to x₁:y₁Is prepared into a nickel-manganese metal salt solution with the concentration of 2-4mol/L, wherein x is more than or equal to 0.1 ≦ x₁≦0.9，0.1≦y₁≦0.8；

(2) Introducing N into a reaction kettle with a bottom liquid₂Adding the metal salt solution prepared in the step (1), the organic carboxylic acid solution and the sodium hydroxide solution into a reaction kettle, reacting for 30-80h at 40-60 ℃, and maintaining the pH of the reaction at 10.0-12.0 to obtain Ni with the structural formula of Ni and the average particle size of 3-8 mu m_x1Mn_y1-spheroidal precursor core of MOFs, where 0.1 ≦ x₁≦0.9，0.1≦y₁≦0.8；

(3) Adding a nickel sulfate solution, a sodium metaaluminate solution, an organic carboxylic acid solution and a sodium hydroxide solution into a reaction kettle for continuous reaction, maintaining the pH of the reaction at 10.0-12.0, stirring at a rotation speed of 150-_xMn_yAl_1-x-y-core-shell precursors of MOFs.

3. The preparation method according to claim 2, wherein the base solution in the step (2) comprises an organic carboxylic acid solution, a NaOH solution and pure water, wherein the concentration of the organic carboxylic acid solution is 1-2mol/L, the concentration of the sodium hydroxide solution is 2-4mol/L, the volume ratio of the NaOH solution to the organic carboxylic acid solution is 4:1, and the pH of the base solution is 10.0-12.0; n is a radical of₂The flow rate is 0.5-2m³/h。

4. The preparation method according to claim 2, wherein the concentration of the organic carboxylic acid solution in the step (2) is 1-2mol/L, and the organic carboxylic acid solution is one of a pyromellitic acid solution, 1,2,3, 4-butanetetracarboxylic acid and 5-hydroxyisophthalic acid; the concentration of the sodium hydroxide solution is 2-4 mol/L.

5. The preparation method as claimed in claim 2, wherein the flow rate of the metal salt solution in the step (2) is 30-50L/h, the flow rate of the organic carboxylic acid solution is 5-7.5L/h, the flow rate of the sodium hydroxide solution is 10-15L/h, and the stirring speed is 150-400 r/min.

6. The method according to claim 2, wherein the step (3) is to dissolve anhydrous aluminum sulfate in 2mol/L NaOH to prepare a sodium metaaluminate solution with a concentration of 0.2-0.6 mol/L.

7. The method according to claim 2, wherein the flow rate of the nickel sulfate solution in the step (3) is 30 to 50L/h, the flow rate of the organic carboxylic acid solution is 8 to 10L/h, the flow rate of the sodium hydroxide solution is 8 to 12L/h, and the flow rate of the sodium metaaluminate solution is 10 to 15L/h.

8. A method for preparing a positive electrode material for a cobalt-free lithium battery from the precursor according to any one of claims 1 to 7, wherein the method comprises: presintering the precursor of claim 1 at 300-500 ℃ for 3-5h to obtain the nickel-manganese-aluminum oxide with a core-shell structure; mixing the obtained nickel-manganese-aluminum oxide with LiOH & H₂And mixing the O uniformly according to the mass ratio of 1:1.05, and calcining for 10-20h at the temperature of 600-750 ℃ to obtain the core-shell composite ternary cathode material with the core comprising NiMn and the shell comprising NiAl.

Technical Field

The invention relates to a lithium battery anode material, in particular to an MOFs-based precursor for a cobalt-free lithium battery, an anode material and a preparation method thereof.

Background

In recent years, with the widespread use of rechargeable batteries in electric vehicles, there are currently high demands on energy density, safety performance, rate performance, and manufacturing cost. The cobalt-free material has low cost, so that the cobalt-free material can meet a large amount of demands of the market and is a hot point discussed in the new energy industry in the year. However, Co can stabilize the layered structure of the material in the ternary cathode material, and reduce Li/Ni mixed-row, and is a kind of element which is difficult to replace, and because of this critical factor, the development and application of cobalt-free materials face great challenges. Therefore, the stability deficiency of the cathode material under the cobalt-free condition needs to be improved through two aspects of element components and structure, so that the lithium battery material can solve the problems of 'endurance anxiety' and stability in the current era.

Metal organic framework Materials (MOFs) have been used as a traditional energy storage material, such as super capacitor and battery materials, mainly thanks to their adjustable pore size structure, uniform pore size distribution, high specific surface area, topology and composition diversity. More importantly, mixed metal oxides of MOFs materials have proven to be a very potential precursor that exhibits higher levels after high temperature sinteringSpecific capacity and rate capability. Li is promoted during sintering due to the most characteristic porous nature of the MOFs⁺The de-intercalation can reduce the sintering temperature, simultaneously provide certain buffer for the volume change of the material in the circulating process, reduce the generation of cracks and improve the circulating stability and the safety performance of the material.

With the wide application of ternary lithium batteries in new energy automobiles, the problem of high energy density and high safety is urgently needed to be solved at present, the high nickel material can improve the energy density of the material, but the high Ni content can cause serious Li/Ni mixed discharge, so that a rock salt phase is generated, the cycle performance of the material is reduced, and potential safety hazards are brought at the same time. The middle-low nickel ternary positive electrode materials (NCM111, NCM523 and NCM622) are excellent in nickel (NCM811) material with high safety and cycle performance, but the energy density cannot meet the endurance requirement, and Co is expensive. Therefore, the combination of the components and the structure of the material is required to solve the technical problem faced by the ternary power battery.

Disclosure of Invention

Aiming at the defects of the prior art, the invention provides an MOFs-based precursor for a cobalt-free lithium battery, a positive electrode material and a preparation method thereof.

The invention is realized by the following technical scheme.

An MOFs-based precursor for a cobalt-free lithium battery is characterized in that the physical structure of the precursor is a core-shell structure; the structural formula of the precursor is Ni_xMn_yAl_1-x-y-MOFs, wherein 0.1 ≦ x ≦ 0.9, 0.1 ≦ y ≦ 0.5; the inner core of the precursor is a nickel manganese-MOFs material, wherein Ni accounts for 10-90 mol% of total metals of the inner core, and Mn accounts for 10-80 mol% of the total metals of the inner core; the shell of the precursor is made of nickel aluminum-MOFs materials, wherein the mole percentage of Ni in the total metal in the shell is 70-99%, and the mole percentage of aluminum in the total metal in the shell is 1-30%.

A method for preparing the precursor is characterized by comprising the following steps:

(1) nickel salt and manganese salt are mixed according to the molar ratio of Ni to Mn to x₁:y₁Proportional arrangement ofForming a nickel manganese metal salt solution with the concentration of 2-4mol/L, wherein x is more than or equal to 0.1 ≦ x₁≦0.9，0.1≦y₁≦0.8；

(2) Introducing N into a reaction kettle with a bottom liquid₂Adding the metal salt solution prepared in the step (1), the organic carboxylic acid solution and the sodium hydroxide solution into a reaction kettle, reacting for 30-80h at 40-60 ℃, and maintaining the pH of the reaction at 10.0-12.0 to obtain Ni with the structural formula of Ni and the average particle size of 3-8 mu m_x1Mn_y1-spheroidal precursor core of MOFs (where 0.1 ≦ x)₁≦0.9，0.1≦y₁≦0.8)；

(3) Adding a nickel sulfate solution, a sodium metaaluminate solution, an organic carboxylic acid solution and a sodium hydroxide solution into a reaction kettle for continuous reaction, maintaining the pH of the reaction at 10.0-12.0, stirring at a rotation speed of 150-_xMn_yAl_1-x-y-core-shell precursors of MOFs (0.1 ≦ x ≦ 0.9, 0.1 ≦ y ≦ 0.5).

Further, the base solution in the step (2) comprises an organic carboxylic acid solution, a NaOH solution and pure water, wherein the concentration of the organic carboxylic acid solution is 1-2mol/L, the concentration of the sodium hydroxide solution is 2-4mol/L, the volume ratio of the NaOH solution to the organic carboxylic acid solution is 4:1, and the pH value of the base solution is 10.0-12.0; n is a radical of₂The flow rate is 0.5-2m³/h。

Further, the concentration of the organic carboxylic acid solution in the step (2) is 1-2mol/L, and the organic carboxylic acid solution is one of a pyromellitic acid solution, a 1,2,3, 4-butane tetracarboxylic acid solution, a 5-hydroxy isophthalic acid solution and the like; the concentration of the sodium hydroxide solution is 2-4 mol/L.

Further, the flow rate of the metal salt solution in the step (2) is 30-50L/h, the flow rate of the organic carboxylic acid solution is 5-7.5L/h, the flow rate of the sodium hydroxide solution is 10-15L/h, and the stirring speed is 150-400 r/min.

Further, in the step (3), anhydrous aluminum sulfate is dissolved in 2mol/L NaOH to prepare a sodium metaaluminate solution with a concentration of 0.2-0.6 mol/L.

Further, the flow rate of the nickel sulfate solution in the step (3) is 30-50L/h, the flow rate of the organic carboxylic acid solution is 8-10L/h, the flow rate of the sodium hydroxide solution is 8-12L/h, and the flow rate of the sodium metaaluminate solution is 10-15L/h.

A method for preparing a positive electrode material for a cobalt-free lithium battery from the precursor, which is characterized by comprising the following steps: pre-sintering the precursor at the temperature of 300-500 ℃ for 3-5h to obtain the nickel-manganese-aluminum oxide with the core-shell structure; mixing the obtained nickel-manganese-aluminum oxide with LiOH & H₂And mixing the O uniformly according to the mass ratio of 1:1.05, and calcining for 10-20h at the temperature of 600-750 ℃ to obtain the core-shell composite ternary cathode material with the core comprising NiMn and the shell comprising NiAl.

The invention has the beneficial technical effects that:

(1) nickel-rich nickel aluminum-MOFs materials are used in the shell to form a ternary precursor with a core-shell structure. Mn and Al do not participate in reaction in the charge-discharge cycle process, the whole structure of the layered material is well stabilized by doping Mn element, an important supporting effect is achieved, and meanwhile, the Al element doped in the shell can inhibit the mixed discharge of cations (Li/Ni) when a large amount of lithium ions are removed to a certain extent, so that the safety performance of the material is improved.

(2) The precursor synthesized by the method gets rid of the traditional ammonia water complexing agent in the reaction process, the transition metal directly reacts with the organic matter, primary particles with higher crystallization performance are formed through coordination bonds, and the primary particles are represented by the infinite and ordered arrangement of Ni, Mn, Al and O atoms on the atomic level.

(3) The MOF-based precursor formed by the invention generates volatile gas from organic matters during low-temperature presintering, finally leads the material to form a porous structure, is beneficial to Li extraction, reduces sintering temperature, can improve rate capability in the cycle process, can buffer volume strain brought in the charge-discharge cycle process, embodies electrochemical performances of high rate, high capacity and high cycle performance in the charge-discharge cycle process, and has good development prospect.

Drawings

FIG. 1 shows Ni obtained in example 1 of the present invention_0.80Mn_0.15Al_0.05-SEM picture of MOFs core-shell structure precursor;

FIG. 2 shows Ni obtained in example 1 of the present invention_0.80Mn_0.15Al_0.05-cross-sectional SEM image of MOFs core-shell structure precursor;

fig. 3 is a cross-sectional SEM image of the core-shell structure precursor obtained in example 1 of the present invention, which is obtained by pre-firing at 400 ℃.

FIG. 4 shows Ni obtained in example 2 of the present invention_0.70Mn_0.20Al_0.1-SEM picture of MOFs core-shell structure precursor;

FIG. 5 shows Ni obtained in example 2 of the present invention_0.70Mn_0.20Al_0.10-cross-sectional SEM image of MOFs core-shell structure precursor;

fig. 6 is a cross-sectional SEM image of the core-shell structure precursor obtained in example 2 of the present invention, which is obtained by pre-firing at 400 ℃.

FIG. 7 shows Ni obtained in example 3 of the present invention_0.50Mn_0.30Al_0.20-SEM picture of MOFs core-shell structure precursor;

FIG. 8 shows Ni obtained in example 3 of the present invention_0.50Mn_0.30Al_0.20-cross-sectional SEM image of MOFs core-shell structure precursor;

fig. 9 is a cross-sectional SEM image of the core-shell structure precursor obtained in example 3 of the present invention, which is obtained by pre-firing at 400 ℃.

Detailed Description

The present invention will be described in detail below with reference to the accompanying drawings and specific embodiments.

Example 1

Step 1, at 1m³Adding 500L of pure water, 3kg of a 1mol/L pyromellitic acid solution with the concentration and 6kg of a 2mol/L liquid alkali solution with the volume ratio of the pyromellitic acid solution to the liquid alkali solution being 4:1, testing the pH of a base solution to be 11.4-11.6, and introducing N into the reaction kettle₂At a flow rate of 0.6m³Adding a nickel-manganese mixed sulfate solution with a metal molar ratio of 70:30 and a metal concentration of 2mol/L into a reaction kettle at a flow rate of 30L/h by using a metering pump, simultaneously adding a 1mol/L pyromellitic acid solution and 2mol/L sodium hydroxide into the reaction kettle at flow rates of 5L/h and 10L/h respectively, and controlling the reaction processThe pH value of the flow regulation system for preparing ammonia water and sodium hydroxide is maintained between 11.2 and 11.6, the stirring speed of the stirring paddle is 300-400r/min, the reaction temperature of the system is 40 ℃, and the reaction is carried out for 70 hours. Detecting the particle size of the particles in the reaction kettle by using a laser particle sizer every 1 hour during reaction, controlling the primary particles to be flaky and uniformly aggregated spherical particles by observing the shapes of the primary particles and the secondary particles in the process, and stopping feeding when the average particle size of the particles reaches 7 mu m to obtain the nickel-cobalt-manganese hydroxide Ni_0.7Mn_0.3-MOFs。

And 2, continuously adding a nickel sulfate solution with the concentration of 2mol/L, a sodium metaaluminate solution with the concentration of 0.3mol/L, a pyromellitic acid solution with the concentration of 1mol/L and a sodium hydroxide solution with the concentration of 2mol/L into the reaction kettle at a certain feeding speed for continuous reaction, maintaining the pH value of the reaction to be 11.0-11.2, and stirring at the rotating speed of 180-250r/min, wherein the flow rate of the nickel sulfate is 30L/h, the flow rate of the pyromellitic acid solution is 8L/h, the flow rate of the liquid alkali is 10L/h, and the flow rate of the sodium metaaluminate solution is 10L/h. After 60 hours of cumulative reaction, the target particle size was 11 μm. To obtain a Ni_0.80Mn_0.15Al_0.05-MOFs core-shell precursor, the precursor core being Ni of nickel manganese_0.7Mn_0.3MOFs, Ni with an outer shell of nickel-aluminium_0.9Al_0.1-MOFs, said precursor being a spheroidal structure formed by the accumulation of primary acicular particles.

5Kg of Ni_0.80Mn_0.15Al_0.05Pre-sintering the-MOFs precursor for 3h at 400 ℃ to obtain Ni with good crystallinity_0.8Mn_0.15Al_0.05O_1.5And (3) precursor oxide. The precursor oxide was mixed with 5.25Kg of LiOH. H₂Uniformly mixing O in a Henschel mixer, calcining the mixed material at 600 ℃ for 10h in an oxygen atmosphere, and screening the calcined material to finally obtain the LiNi with the core-shell structure_0.8Mn_0.15Al_0.05O₂A ternary positive electrode material. The positive electrode material is assembled into a CR2025 buckle electric battery, and the electrochemical performance of the CR2025 buckle electric battery is detected, and the result shows that: the discharge capacity is 210.25mA/g in the current density of 0.1C (17mA/g) and the voltage range of 2.5-4.3V, and the capacity retention rate of 50 circles in 1C circulation is 98.56％。

Example 2

Step 1, at 1m³500L of pure water, 3kg of 1,2,3, 4-butane tetracarboxylic acid solution with the concentration of 1.5mol/L and 6kg of liquid alkali solution with the concentration of 3mol/L are added into a reaction kettle, the pH value of a bottom solution is tested to be 10.4-11, and N is introduced into the reaction kettle₂Flow rate of 2m³Adding a nickel-manganese mixed salt solution with a metal molar ratio of 50:50 and a metal concentration of 3mol/L into a reaction kettle at a flow rate of 40L/h by using a metering pump, simultaneously adding 1.5mol/L of a 1,2,3, 4-butane tetracarboxylic acid solution and 3mol/L of sodium hydroxide into the reaction kettle, wherein the flow rates are respectively 6L/h and 12L/h, adjusting the pH of a system to be 10-10.6 by controlling the flow rates of ammonia water and sodium hydroxide in the reaction process, adjusting the stirring speed of a stirring paddle to be 150-200r/min, the reaction temperature of the system to be 50 ℃, and the reaction time to be 40 h. Detecting the particle size of the particles in the reaction kettle by using a laser particle sizer every 1 hour during reaction, controlling the primary particles to be flaky and uniformly aggregated spherical particles by observing the shapes of the primary particles and the secondary particles in the process, and stopping feeding when the average particle size of the particles reaches 5 mu m to obtain the nickel-cobalt-manganese hydroxide Ni_0.5Mn_0.5-MOFs。

And 2, continuously adding a nickel sulfate solution with the concentration of 3mol/L, a sodium metaaluminate solution with the concentration of 0.4mol/L, a 1.5 mol/L1, 2,3, 4-butane tetracarboxylate solution and a 2mol/L sodium hydroxide solution into the reaction kettle at a certain feeding speed for continuous reaction, maintaining the pH value of the reaction to be 10-11, and stirring at the rotating speed of 150-180r/min, wherein the flow rate of nickel sulfate is 40L/h, the flow rate of the 1,2,3, 4-butane tetracarboxylate solution is 9L/h, the flow rate of liquid alkali is 8L/h, and the flow rate of the sodium metaaluminate solution is 15L/h. Ni reaching the target particle size of 13 mu m after 40h of cumulative reaction_0.7Mn_0.2Al_0.1-MOFs core-shell precursor, the precursor core being Ni of nickel manganese_0.5Mn_0.5MOFs, shell of Ni-Al N_0.8Al_0.2-MOFs, said precursor being a spheroidal structure formed by the accumulation of primary acicular particles.

5Kg of Ni_0.7Mn_0.2Al_0.1Pre-sintering the-MOFs precursor at 300 ℃ for 4h to obtain Ni with good crystallinity_0.7Mn_0.2Al_0.1O_1.5And (3) precursor oxide. The precursor oxide was mixed with 5.25Kg of LiOH. H₂Uniformly mixing O in a Henschel mixer, calcining the mixed material at 650 ℃ for 15h in an oxygen atmosphere, and screening the calcined material to finally obtain the LiNi with the core-shell structure_0.7Mn_0.2Al_0.1O₂A ternary positive electrode material. The positive electrode material is assembled into a CR2025 buckle electric battery, and the electrochemical performance of the CR2025 buckle electric battery is detected, and the result shows that: the discharge capacity is 205.26mA/g in the current density of 0.1C (17mA/g) and the voltage range of 2.5-4.3V, and the capacity retention rate of 50 circles of 1C circulation is 98.76%.

Example 3

Step 1, at 1m³500L of pure water, 3kg of a 2 mol/L5-hydroxyisophthalic acid solution and 6kg of a 4mol/L liquid alkali solution were added to the reaction vessel, the pH of the base solution was measured to be 11.7 to 12, and N was introduced into the reaction vessel₂Adding a nickel-manganese mixed salt solution with a metal molar ratio of 25:75 and a metal concentration of 4mol/L into a reaction kettle at a flow rate of 50L/h by using a metering pump, simultaneously adding 2mol/L of a 5-hydroxyisophthalic acid solution and 4mol/L of sodium hydroxide into the reaction kettle, wherein the flow rates are 7.5L/h and 15L/h respectively, adjusting the pH value of a system to be 11.7-12 by controlling the flow rates of ammonia water and sodium hydroxide in the reaction process, and reacting for 80h at a reaction temperature of 60 ℃ with the stirring speed of 300-400r/min by using a stirring paddle. Detecting the particle size of the particles in the reaction kettle by using a laser particle sizer every 1 hour during reaction, controlling the primary particles to be flaky and uniformly aggregated spherical particles by observing the shapes of the primary particles and the secondary particles in the process, and stopping feeding when the average particle size of the particles reaches 8 mu m to obtain the nickel-cobalt-manganese hydroxide Ni_0.25Mn_0.75-MOFs。

Step 2, continuously adding a nickel sulfate solution with the concentration of 4mol/L, a sodium metaaluminate solution with the concentration of 0.6mol/L, a 5-hydroxy isophthalic acid solution with the concentration of 2mol/L and a sodium hydroxide solution with the concentration of 4mol/L into a reaction kettle at a certain feeding speed for continuous reaction, maintaining the pH value of the reaction to be 11.0-11.2, and stirring at the rotating speed of 180-250r/min, wherein the flow rate of the nickel sulfate is 50L/h, and the flow rate of the 5-hydroxy isophthalic acid is 250r/minThe flow rate of the acid solution is 10L/h, the flow rate of the liquid caustic soda is 12L/h, and the flow rate of the sodium metaaluminate solution is 15L/h. The reaction was accumulated for 60 hours to reach the target particle size of 15 μm. To obtain a Ni_0.5Mn_0.3Al_0.2-MOFs core-shell precursor, the precursor core being Ni of nickel manganese_0.5Mn_0.5MOFs, Ni with an outer shell of nickel-aluminium_0.7Al_0.3-MOFs, said precursor being a spheroidal structure formed by the accumulation of primary acicular particles.

5Kg of Ni_0.5Mn_0.3Al_0.2Pre-sintering the-MOFs precursor for 5h at 500 ℃ to obtain Ni with good crystallinity_0.5Mn_0.3Al_0.2O_1.5And (3) precursor oxide. The precursor oxide was mixed with 5.25Kg of LiOH. H₂Uniformly mixing O in a Henschel mixer, calcining the mixed material at 750 ℃ for 20h in an oxygen atmosphere, and screening the calcined material to finally obtain the LiNi with the core-shell structure_0.5Mn_0.3Al_0.2O₂A ternary positive electrode material. The positive electrode material is assembled into a CR2025 buckle electric battery, and the electrochemical performance of the CR2025 buckle electric battery is detected, and the result shows that: the discharge capacity is 203.57mA/g in the current density of 0.1C (17mA/g) and the voltage range of 2.5-4.3V, and the capacity retention rate of 50 circles of 1C circulation is 97.84%.

The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention. It should be noted that other equivalent modifications can be made by those skilled in the art in light of the teachings of the present invention, and all such modifications can be made as are within the scope of the present invention.