Nonaqueous electrolyte secondary battery, method for evaluating negative electrode material layer, and method for manufacturing nonaqueous electrolyte secondary battery
阅读说明:本技术 非水电解质二次电池、负极合材层的评价方法和非水电解质二次电池的制造方法 (Nonaqueous electrolyte secondary battery, method for evaluating negative electrode material layer, and method for manufacturing nonaqueous electrolyte secondary battery ) 是由 大泽良辅 谷口明宏 井上薫 于 2019-07-19 设计创作,主要内容包括:本发明涉及非水电解质二次电池、负极合材层的评价方法和非水电解质二次电池的制造方法。非水电解质二次电池至少包含负极合材层。负极合材层包含负极活性物质、导电材料和粘合剂。负极活性物质包含氧化硅材料和石墨材料。负极合材层具有3.5m<Sup>2</Sup>/g以上且5.0m<Sup>2</Sup>/g以下的BET比表面积。在负极合材层的伸长率为横轴、负极合材层的电阻为纵轴的正交坐标系中,屈服点(Cp)的伸长率为12%以上。(The present invention relates to a nonaqueous electrolyte secondary battery, a method for evaluating a negative electrode material layer, and a method for manufacturing a nonaqueous electrolyte secondary battery. Nonaqueous electrolyte secondary battery packContaining a negative electrode binder layer. The negative electrode mix layer contains a negative electrode active material, a conductive material, and a binder. The negative electrode active material contains a silicon oxide material and a graphite material. The anode composite layer had a thickness of 3.5m 2 More than g and 5.0m 2 BET specific surface area of,/g or less. The elongation of the yield point (Cp) is 12% or more in an orthogonal coordinate system in which the elongation of the negative electrode material layer is the horizontal axis and the resistance of the negative electrode material layer is the vertical axis.)
1. A nonaqueous electrolyte secondary battery comprising at least a negative electrode binder layer,
the negative electrode mixture layer contains a negative electrode active material, a conductive material, and a binder,
the negative electrode active material contains a silicon oxide material and a graphite material,
the above negative electrode composite material layer has a thickness of 3.5m2More than g and 5.0m2A BET specific surface area of not more than g,
the negative electrode composite layer was stretched by 1% successively in directions orthogonal to the thickness direction thereof, and the electric resistance of the negative electrode composite layer was measured each time,
when the measurement point group is plotted in an orthogonal coordinate system in which the elongation of the negative electrode material layer is the horizontal axis and the resistance of the negative electrode material layer is the vertical axis,
the elongation at yield point in the above-mentioned measurement point group is 12% or more.
2. The nonaqueous electrolyte secondary battery according to claim 1, wherein the binder has a larger mass part than the conductive material.
3. The nonaqueous electrolyte secondary battery according to claim 1 or 2, wherein the binder is contained by 3 parts by mass or more and 5 parts by mass or less with respect to 100 parts by mass of the negative electrode active material.
4. The nonaqueous electrolyte secondary battery according to any of claim 1 to 3, wherein the binder contains carboxymethyl cellulose and styrene-butadiene rubber.
5. The nonaqueous electrolyte secondary battery of any of claims 1-4, wherein the conductive material comprises carbon nanotubes and graphene.
6. A method for evaluating a negative electrode binder layer, comprising at least:
preparing a negative electrode binder layer, and
evaluating the negative electrode alloy layer;
the negative electrode mixture layer contains a negative electrode active material, a conductive material, and a binder,
the negative electrode active material contains a silicon oxide material and a graphite material,
the negative electrode composite layer was stretched by 1% successively in directions orthogonal to the thickness direction thereof, and the electric resistance of the negative electrode composite layer was measured each time,
drawing a measurement point group in an orthogonal coordinate system in which the elongation of the negative electrode material layer is the horizontal axis and the resistance of the negative electrode material layer is the vertical axis,
the negative electrode material layer is evaluated based on the magnitude of the elongation at the yield point in the measurement point group.
7. A method for manufacturing a nonaqueous electrolyte secondary battery, comprising at least:
evaluating the negative electrode binder layer by the evaluation method of the negative electrode binder layer according to claim 6, and
manufacturing a nonaqueous electrolyte secondary battery including at least the negative electrode mixture layer;
the elongation at the yield point of the negative electrode material layer is 12% or more,
the above negative electrode composite material layer has a thickness of 3.5m2More than g and 5.0m2BET specific surface area of,/g or less.
Technical Field
The present disclosure relates to a nonaqueous electrolyte secondary battery, a method for evaluating a negative electrode composite material layer, and a method for manufacturing a nonaqueous electrolyte secondary battery.
Background
Japanese patent laid-open publication No. 2017-199657 discloses a negative electrode composite layer comprising a silicon oxide material, a graphite material, a conductive material, and a binder.
Disclosure of Invention
In general, the main component of the negative electrode mixture layer is a negative electrode active material. Conventionally, a graphite material has been used as a negative electrode active material. In recent years, silicon oxide materials have also been studied as negative electrode active materials. Silicon oxide materials can have a large specific capacity compared to graphite materials. By using a mixture of a silicon oxide material and a graphite material, an increase in battery capacity can be expected as compared with the use of a graphite material alone.
However, the volume change of the silicon oxide material tends to be large in association with charge and discharge. Therefore, in the mixed system of the silicon oxide material and the graphite material, the distance between the silicon oxide material and the graphite material changes greatly every charge and discharge. It is considered that in the initial anode composite layer, a conductive path is formed between the silicon oxide material and the graphite material. However, as the distance between the silicon oxide material and the graphite material becomes large, the conductive path is stretched. Thereby, the conductive path may disappear. It is considered that capacity deterioration is promoted due to disappearance of the conductive path. That is, charge-discharge cycle characteristics are considered to be degraded.
By adding a large amount of conductive material to the negative electrode mixture layer, it is expected that many conductive paths are formed. By having many conductive paths, it is expected that the conductive paths will not easily disappear during charge and discharge cycles. However, it is considered that the specific surface area of the negative electrode binder layer increases due to the large amount of the conductive material contained in the negative electrode binder layer. Due to the increase in specific surface area, the decomposition reaction of the nonaqueous electrolyte tends to be promoted at the time of high-temperature storage. That is, the high-temperature storage characteristics tend to be lowered.
The purpose of the present disclosure is to improve charge-discharge cycle characteristics and suppress a decrease in high-temperature storage characteristics in a nonaqueous electrolyte secondary battery in which a negative electrode material layer contains a silicon oxide material and a graphite material.
The technical configuration and operational effects of the present disclosure will be described below. However, the mechanism of action of the present disclosure encompasses presumption. The correctness of the mechanism of action should not limit the scope of the claims.
[1]The nonaqueous electrolyte secondary battery includes at least a negative electrode composite material layer. The negative electrode mix layer contains a negative electrode active material, a conductive material, and a binder. The negative electrode active material contains a silicon oxide material and a graphite material. The anode composite layer had a thickness of 3.5m2More than g and 5.0m2The negative electrode composite material layer is stretched by 1% successively in directions orthogonal to the thickness direction thereof, the resistance of the negative electrode composite material layer is measured each time, and when a measurement point group is plotted in an orthogonal coordinate system in which the elongation of the negative electrode composite material layer is the horizontal axis and the resistance of the negative electrode composite material layer is the vertical axis, the elongation of the yield point in the measurement point group is 12% or more.
The yield point represents an -side measurement point where the elongation is small when the difference in resistance between 2 adjacent measurement points exceeds 0.1 Ω.
Fig. 1 is an orthogonal coordinate system in which the elongation of the negative electrode binder layer is the horizontal axis and the resistance of the negative electrode binder layer is the vertical axis, in the present disclosure, the change in the resistance of the negative electrode binder layer with respect to the elongation of the negative electrode binder layer is measured, and as the elongation of the negative electrode binder layer increases, the resistance of the negative electrode binder layer also increases, which is considered to be because the conductive path between the negative electrode active materials gradually disappears inside the negative electrode binder layer due to the negative electrode binder layer being stretched, and when the elongation of the negative electrode binder layer becomes equal to or greater than , the resistance sharply increases.
The elongation at yield point is considered to represent the strength of the conductive path to elongation. It is considered that the larger the elongation at the yield point, the more difficult the conductive path becomes to disappear. The elongation at the yield point becomes 12% or more, and thus the conductive path can have resistance (withstand) to stretching accompanying the volume change of the silicon oxide material. That is, even in a mixed system of a silicon oxide material and a graphite material, it is considered that a conductive path is likely to be continued during charge and discharge cycles. Therefore, improvement of charge-discharge cycle characteristics can be expected.
The elongation at the yield point can be adjusted by, for example, the composition of the negative electrode composite layer or the like. However, the composition of the negative electrode binder layer was adjusted so that the BET specific surface area of the negative electrode binder layer became 3.5m2More than g and 5.0m2The ratio of the carbon atoms to the carbon atoms is less than g. At a BET specific surface area of less than 3.5m2In the case of/g, the elongation at yield point is hardly 12% or more. This is thought to be due to insufficient conductive paths. At a BET specific surface area of more than 5.0m2In the case of/g, the decomposition reaction of the nonaqueous electrolyte may be accelerated during high-temperature storage. That is, the high-temperature storage characteristics may be degraded.
As described above, in the nonaqueous electrolyte secondary battery of the present disclosure, it is expected that the charge-discharge cycle specificity is improved and the degradation of the high-temperature storage characteristics is suppressed.
[2] The adhesive may have a greater mass part than the conductive material.
Since the binder is more than the conductive material, the increase in BET specific surface area accompanying the addition of the conductive material tends to be suppressed, it is considered that this is because portions of the conductive material are covered with the binder.
[3] The binder may be contained by, for example, 3 parts by mass or more and 5 parts by mass or less with respect to 100 parts by mass of the negative electrode active material.
[4] The binder may comprise, for example, carboxymethylcellulose (CMC) and styrene-butadiene rubber (SBR).
[5] The conductive material may include, for example, Carbon Nanotubes (CNTs) and graphene.
The graphene is in the form of a sheet. The graphene is expected to form a conductive path so as to bridge the particles (negative electrode active material). The CNTs have a fine tubular shape. CNTs are expected to adhere to the particle surface and to become the contact point between the particle and graphene. By combining CNTs with graphene, it is expected that a highly elongated conductive path is formed. That is, the elongation at the yield point is expected to be large.
[6] The method for evaluating the negative electrode mixture layer includes at least the following (a) and (b).
(a) A negative electrode mix layer is prepared.
(b) The negative electrode composite layer was evaluated.
The negative electrode mix layer contains a negative electrode active material, a conductive material, and a binder. The negative electrode active material contains a silicon oxide material and a graphite material.
The negative electrode composite layer was successively stretched by 1% in directions orthogonal to the thickness direction thereof, and the resistance of the negative electrode composite layer was measured each time.
The yield point represents an -side measurement point where the elongation is small when the difference in resistance between 2 adjacent measurement points exceeds 0.1 Ω.
According to the method for evaluating a negative electrode mixture layer of the present disclosure, it is possible to evaluate how much resistance the conductive path has against stretching accompanying a volume change of the silicon oxide material.
[7] The method for manufacturing a nonaqueous electrolyte secondary battery includes at least the following (A) and (B).
(A) The negative electrode binder layer was evaluated by the method for evaluating a negative electrode binder layer described in [6 ].
(B) A nonaqueous electrolyte secondary battery including at least a negative electrode composite material layer is manufactured.
The elongation at the yield point of the negative electrode material layer is 12% or more. The anode composite layer had a thickness of 3.5m2More than g and 5.0m2BET specific surface area of,/g or less.
According to the method for manufacturing a nonaqueous electrolyte secondary battery of the present disclosure, it is expected that charge-discharge cycle specificity is improved and degradation of high-temperature storage characteristics is suppressed.
The above and other objects, features, aspects and advantages of the present disclosure will become apparent from the following detailed description of the present disclosure, which is to be read in connection with the accompanying drawings.
Drawings
Fig. 1 is an orthogonal coordinate system in which the elongation of the negative electrode material layer is the horizontal axis and the resistance of the negative electrode material layer is the vertical axis.
Fig. 2 is a schematic diagram of an example showing the configuration of the nonaqueous electrolyte secondary battery of the present embodiment.
Fig. 3 is a schematic diagram of an example showing the structure of the electrode group according to the present embodiment.
Fig. 4 is a schematic diagram of an example showing the structure of the negative electrode of the present embodiment.
Fig. 5 is a schematic cross-sectional view showing a sample piece.
Fig. 6 is a schematic diagram of an example showing the structure of the positive electrode of the present embodiment.
Fig. 7 is a flowchart illustrating an outline of the method for evaluating the negative electrode binder layer according to the present embodiment.
Fig. 8 is a flowchart showing an outline of the method for manufacturing the nonaqueous electrolyte secondary battery of the present embodiment.
Detailed Description
Hereinafter, embodiments of the present disclosure (referred to as "the present embodiments" in the present specification) will be described. However, the following description does not limit the claims.
< nonaqueous electrolyte Secondary Battery >
Fig. 2 is a schematic diagram of an example showing the configuration of the nonaqueous electrolyte secondary battery of the present embodiment.
The
The
Fig. 3 is a schematic diagram of an example showing the structure of the electrode group according to the present embodiment.
The
The
Negative electrode
Fig. 4 is a schematic diagram of an example showing the structure of the negative electrode of the present embodiment.
The
The negative electrode
Negative electrode Material layer
The negative
< elongation at yield Point >
The elongation at yield point of the negative
The elongation at yield point is determined by the following procedure.
A polyethylene terephthalate (PET) film was prepared. The PET film had a thickness of 50 μm. The PET film may be, for example, a product name "lolo miller (ルミラー)" manufactured by toki (imperial レ) corporation. A PET film having the same quality as that of the film can be prepared.
A double-sided tape may be prepared, for example, under the product name "ナイスタック" manufactured by nippon japanese (ニチバン) corporation, and a double-sided tape of the same quality as the double-sided tape may be prepared, the double-sided tape includes a 1 st adhesive surface and a 2 nd adhesive surface, the 2 nd adhesive surface being the surface opposite to the 1 st adhesive surface, the 1 st adhesive surface being bonded to the PET film, the 2 nd adhesive surface being bonded to the surface of the negative
A tensile tester was prepared. The tensile testing machine may be a universal testing machine. The universal tester is a tester capable of performing tests other than the tensile test (for example, a compression test). The tensile testing machine may be, for example, a tensile compression testing machine (product name "テクノグラフ") manufactured by meibeama (ミネベアミツミ) ltd. A tensile tester having a function equivalent to that of the above-described tensile tester may be used.
Fig. 5 is a schematic cross-sectional view showing a sample piece.
The
The
The stretching behavior was carried out at room temperature (20 ℃ C.. + -. 5 ℃ C.). The drawing speed was 5 mm/min. The stretching behavior was temporarily stopped at the time when the negative
After the stretching behavior was stopped, the resistance of the negative
After the resistance measurement, the stretching operation was started again. The stretching operation was temporarily stopped at the time when the negative
Thereafter, the stretching operation and the measurement of the electric resistance were repeated in the same manner as described above. That is, the negative
The measurement results are plotted on an orthogonal coordinate system (fig. 1) in which the elongation of the negative
The elongation at yield point was measured in at least 3 test pieces, respectively. The arithmetic mean of at least 3 coupons was used.
The larger the elongation at yield point, the more the improvement of the charge-discharge cycle characteristics can be expected. The elongation at the yield point may be 13% or more, for example. The upper limit of the elongation at yield point should not be particularly limited. The elongation at yield point may be 14% or less, for example.
< BET specific surface area >
The negative
The BET specific surface area indicates a specific surface area measured by a BET multipoint method, and can be measured by a method based on "JIS 6217-7: 2013", a negative
< composition of negative electrode Binder layer >
The negative
(negative electrode active Material)
The negative electrode active material contains a silicon oxide material and a graphite material. The volume change of the silicon oxide material tends to be large in association with charge and discharge. That is, the silicon oxide material expands greatly due to an alloying reaction with lithium (Li) ions, and contracts greatly due to a dealloying reaction with Li ions.
The silicon oxide material is typically a group of particles (powder). The silicon oxide material may have a D50 of 1 μm or more and 30 μm or less, for example. "D50" represents a particle diameter at which the cumulative particle volume from the microparticle side becomes 50% of the total particle volume in the volume-based particle size distribution. D50 can be measured by, for example, a laser diffraction particle size distribution measuring apparatus. The silicon oxide material may have a D50 of 1 μm or more and less than 10 μm, for example.
The silicon oxide material represents a compound containing silicon (Si) and oxygen (O) as essential components. The silicon oxide material can be represented by, for example, the following formula (I):
SiOx…(I)
(wherein x is 0 < x < 2.)
In the above formula (I), "x" represents the ratio of the atomic concentration of O to the atomic concentration of Si. x can be measured by, for example, Auger electron spectroscopy, glow discharge mass spectrometry, inductively coupled plasma luminescence analysis, or the like. x can be measured at least 3 times. An arithmetic mean of at least 3 times may be used.
In the formula (I), x may satisfy, for example, 0.5. ltoreq. x.ltoreq.1.5. x can, for example, satisfy 0.8 ≦ x ≦ 1.2. The silicon oxide material may be a compound consisting essentially of Si and O. The silicon oxide material may contain elements other than Si and O in a trace amount. "minute amount" means, for example, an amount of 1 mol% or less. The element contained in a trace amount may be, for example, an element that is inevitably mixed in during synthesis of a silicon oxide material.
The graphite material occludes Li ions and emits Li ions. The graphitic material is typically a population of particles. The graphite material may have D50 of 1 μm or more and 30 μm or less, for example. The graphite material may have a greater D50 than the silicon oxide material, for example. The graphite material may have D50 of 10 μm or more and 20 μm or less, for example.
The graphite material may include, for example, at least kinds selected from graphite, graphitizable carbon, and graphitizable-less carbon, the graphite may be, for example, natural graphite, the graphite may be, for example, artificial graphite, the graphite material may further include, for example, amorphous carbon or the like as long as it includes the graphite crystal and the graphite-like crystal.
The silicon oxide material and the graphite material satisfy, for example, a "silicon oxide material: the silicon material is in a relation of 1: 99-99: 1 ". The silicon oxide material and the graphite material satisfy, for example, a "silicon oxide material: the silicon material is in a relation of 1: 99-50: 50 ″. The silicon oxide material and the graphite material satisfy, for example, a "silicon oxide material: the silicon material is 1: 99-20: 80 ″. The silicon oxide material and the graphite material satisfy, for example, a "silicon oxide material: the silicon material is in a relation of 5: 99-10: 90 ".
The negative electrode active material may be composed substantially of a silicon oxide material and a graphite material, and the negative electrode active material may further include steps of other negative electrode active materials as long as the silicon oxide material and the graphite material are included, for example, silicon, a silicon-based alloy, tin oxide, a tin-based alloy, lithium titanate, and the like are considered as other negative electrode active materials, and the other negative electrode active materials may be included in an amount of, for example, 1 mass% or more and 50 mass% or less with respect to the entire negative electrode active material.
(conductive Material)
The conductive material means a material that forms a conductive path within the negative
The conductive material may comprise, for example, at least selected from CNT and graphene, the conductive material may comprise, for example, CNT and graphene, by coexistence of CNT and graphene in the
The CNTs have a fine tubular shape. The CNTs may have an average diameter of 0.4nm or more and 40nm or less, for example. The CNTs may have an average length of 10nm or more and 15 μm or less, for example. The average diameter and average length may each be an average of, for example, 10 CNTs. The diameter and the length can be measured by, for example, a Transmission Electron Microscope (TEM) or the like.
The graphene is in the form of a sheet. The graphene may have a D50 of 2 μm or more and 20 μm or less, for example. The graphene may be composed of, for example, 1-layer graphene sheets. The graphene may be formed by stacking, for example, 2 or more and 30 or less graphene sheets. The graphene may have an aspect ratio of 150 or more and 700 or less, for example. The aspect ratio here represents a value obtained by dividing D50 by the average thickness. The average thickness may be, for example, an average of 10 graphenes. The thickness of the graphene can be measured by an Atomic Force Microscope (AFM), for example.
The more the conductive material is, the more the yield point elongation tends to become large. However, the BET specific surface area of the negative
(Binder)
The binder is a material that binds the constituent elements of the negative
The binder may comprise, for example, CMC and SBR. The BET specific surface area of the negative
The adhesive may have a greater mass part than the conductive material. By the binder being more than the conductive material, an increase in BET specific surface area accompanying the addition of the conductive material tends to be suppressed. The binder may be contained by, for example, 1 part by mass or more and 10 parts by mass or less with respect to 100 parts by mass of the negative electrode active material. The binder may be contained by, for example, 3 parts by mass or more and 5 parts by mass or less with respect to 100 parts by mass of the negative electrode active material.
Positive electrode
Fig. 6 is a schematic diagram of an example showing the structure of the positive electrode of the present embodiment.
The
The positive electrode
The positive
The positive
The positive
The positive
Separating body
The
Note that the
Non-aqueous electrolyte
The
The electrolyte contains at least a Li salt and a solvent. The Li salt is dissolved in the solvent. The concentration of the Li salt may be, for example, 0.5mol/L to 2mol/L (0.5M to 2M). The Li salt may be, for example, LiPF6、LiBF4、LiN(FSO2)2、LiN(CF3SO2)2And the like. The electrolyte may contain 1 lithium salt alone. The electrolyte may contain 2 or more lithium salts。
The solvent is aprotic. The solvent may be, for example, a mixture of cyclic carbonates and chain carbonates. The mixing ratio may be, for example, "cyclic carbonate: the chain carbonate is 1:9 to 5:5 (volume ratio) ".
The cyclic carbonate may be, for example, Ethylene Carbonate (EC), Propylene Carbonate (PC), Butylene Carbonate (BC), fluoroethylene carbonate (FEC), or the like. The solvent may comprise 1 cyclic carbonate alone. The solvent may contain 2 or more cyclic carbonates.
Examples of the chain carbonate include dimethyl carbonate (DMC), Ethyl Methyl Carbonate (EMC), and diethyl carbonate (DEC). The solvent may contain 1 chain carbonate alone. The solvent may contain 2 or more kinds of chain carbonates.
The solvent may include, for example, a lactone, a cyclic ether, a chain ether, a carboxylic acid ester, and the like. The lactone may be, for example, gamma-butyrolactone (GBL), delta-valerolactone, or the like. Examples of cyclic ethers are Tetrahydrofuran (THF), 1, 3-dioxolane, 1, 4-bis
Alkanes, and the like. The chain ether may be, for example, 1, 2-Dimethoxyethane (DME). The carboxylic acid ester may be, for example, Methyl Formate (MF), Methyl Acetate (MA), Methyl Propionate (MP), or the like.The electrolyte solution may contain various additives in addition to the Li salt and the solvent, and the electrolyte solution may contain, for example, additives of 0.005mol/L or more and 0.5mol/L or less.
The gas generating agent may be, for example, Cyclohexylbenzene (CHB), Biphenyl (BP), or the like. The SEI film-forming agent may be, for example, Vinylene Carbonate (VC), Vinyl Ethylene Carbonate (VEC), LiB (C)2O4)2、LiPO2F2Propane Sultone (PS), Ethylene Sulfite (ES), and the like. The flame retardant may be, for example, a phosphate ester, a phosphazene, or the like.
< method for evaluating negative electrode Binder layer >
Fig. 7 is a flowchart illustrating an outline of the method for evaluating the negative electrode binder layer according to the present embodiment.
The method for evaluating the negative electrode binder layer of the present embodiment includes at least "(a) preparation of the negative electrode binder layer" and "(b) evaluation of the negative electrode binder layer". According to the method for evaluating the negative electrode mixture layer of the present embodiment, it is possible to evaluate how much resistance the conductive path has against stretching due to a change in volume of the silicon oxide material.
(a) preparation of negative electrode mixture layer
The method of evaluating the negative electrode binder layer of the present embodiment includes preparing the negative
Evaluation of negative electrode Material layer (b)
The method of evaluating the negative electrode binder layer of the present embodiment includes evaluating the negative
That is, the negative electrode
The measurement point group is plotted in an orthogonal coordinate system (fig. 1) in which the horizontal axis represents the elongation of the negative
The negative
The yield point represents an -side measurement point where the elongation is small when the difference in resistance between 2 adjacent measurement points exceeds 0.1 Ω.
The magnitude of the elongation at the yield point is believed to be indicative of the strength of the conductive path to elongation. For example, it is considered that the anode composite layer 22 (anode 20) can be selected according to the magnitude of the elongation of the yield point.
The BET specific surface area of the negative
< method for producing nonaqueous electrolyte Secondary Battery >
Fig. 8 is a flowchart showing an outline of the method for manufacturing the nonaqueous electrolyte secondary battery of the present embodiment. The method for manufacturing a nonaqueous electrolyte secondary battery of the present embodiment includes at least "(a) evaluation of a negative electrode mixture layer" and "(B) manufacture of a nonaqueous electrolyte secondary battery".
Evaluation of negative electrode Material layer (A)
The method of manufacturing the nonaqueous electrolyte secondary battery of the present embodiment includes evaluating the negative
(B) production of nonaqueous electrolyte Secondary Battery
The method of manufacturing the nonaqueous electrolyte secondary battery of the present embodiment includes manufacturing the
The elongation at the yield point of the negative
Therefore, according to the method for manufacturing a nonaqueous electrolyte secondary battery of the present embodiment, it is considered that the
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