Lithium ion battery negative electrode and preparation method thereof

A lithium ion battery and negative electrode technology, applied in the field of lithium ion battery negative electrode and its preparation, can solve the problems of traditional lithium ion battery application limitations, large thickness expansion rate, short cycle life, etc., to achieve improved polarization effect and low gram capacity , good magnification performance

Active Publication Date: 2020-07-28
ZHUHAI COSMX BATTERY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] Traditional lithium-ion batteries have shortcomings such as fast capacity decay, short cycle life, large thickness expansion rate, and easy lithium analysis during charging and discharging, which severely limit the application of traditional lithium-ion batteries.

Method used

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  • Lithium ion battery negative electrode and preparation method thereof
  • Lithium ion battery negative electrode and preparation method thereof

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Experimental program
Comparison scheme
Effect test

specific Embodiment approach 1

[0026] A lithium-ion battery negative electrode, comprising a negative electrode collector 3 and a negative electrode coating, the negative electrode coating includes a coating I1 and a coating II2, the coating I1 is coated on one surface of the negative electrode collector 3, the Coating II2 is coated on the other surface of negative electrode current collector 3, said coating I1 includes negative electrode active material I, conductive agent, thickener I, dispersant I and binder I, and said coating II2 includes Negative electrode active material II, conductive agent, thickener II, dispersant II and binder II, the viscosity of the thickener I is greater than that of the thickener II, the viscosity of the dispersant I is greater than that of the dispersant II, the The modulus of elasticity of binder I is greater than that of binder II.

[0027] Preferably, the thickener I and the thickener II are the same substance, the dispersant I and the dispersant II are the same substance...

specific Embodiment approach 2

[0037] The preparation method of lithium-ion battery negative electrode described in the specific embodiment one, comprises the following steps:

[0038] S1: Negative electrode active material I, conductive agent, thickener I, dispersant I and binder I are uniformly dispersed in a solvent to make negative electrode slurry A, and negative electrode slurry A is coated on one of the negative electrode current collectors 3 A coating I1 is formed on the surface;

[0039] S2: Negative electrode active material II, conductive agent, thickener II, dispersant II, and binder II are uniformly dispersed in a solvent to make negative electrode slurry B, and negative electrode slurry B is coated on the other side of the negative electrode current collector 3 A coating II2 is formed on one surface;

[0040] S3: The negative electrode current collector 3 coated with the negative electrode slurry A and the negative electrode slurry B is dried to remove the solvent, and the negative electrode ...

specific Embodiment approach 3

[0044] The method for preparing a negative electrode of a lithium-ion battery described in the specific embodiment 2, in step S1, the specific preparation method of the negative electrode slurry A is:

[0045] Step 1: 10% to 40% of the total mass of the thickener I and dispersant I and all the conductive agents are mixed and evenly dispersed in the solvent;

[0046] Step 2: Then add 20% to 30% of the total mass of the negative electrode active material I and 20% to 30% of the total mass of the thickener I and dispersant I, and disperse evenly;

[0047] Step 3: adding 20% ​​to 30% of the total mass of the negative electrode active material I and 30% to 70% of the total mass of the thickener I and dispersant I, and disperse evenly;

[0048] Step 4: adding 20% ​​to 30% of the total mass of the negative electrode active material I, and dispersing evenly;

[0049]Step 5: adding 10% to 40% of the total mass of the negative electrode active material I, and dispersing evenly;

[005...

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Abstract

The invention discloses a lithium ion battery negative electrode and a preparation method thereof, and belongs to the technical field of lithium-ion batteries. The specific scheme is as follows: the lithium ion battery negative electrode comprises a negative electrode current collector and a negative electrode coating, the negative electrode coating comprises a coating I and a coating II which arerespectively coated on two surfaces of the negative electrode current collector, the coating I comprises a negative electrode active material I, a conductive agent, a thickening agent I, a dispersingagent I and a binding agent I, the coating II comprises a negative electrode active material II, a conductive agent, a thickening agent II, a dispersing agent II and a binding agent II, the viscosityof the thickening agent I is greater than that of the thickening agent II, the viscosity of the dispersing agent I is greater than that of the dispersing agent II, the elastic modulus of the bindingagent I is greater than that of the binding agent II, and the high-viscosity thickening agent I, the high-viscosity dispersing agent I and the high-elastic modulus binding agent I are used in negativeelectrode slurry A, so that the consumption of the thickening I, the dispersing agent I and the binding I can be reduced, the consumption of the conductive agent is increased, and the dynamic performance of a long coating paste layer of the negative electrode is further improved.

Description

technical field [0001] The invention belongs to the technical field of lithium ion batteries, and in particular relates to a lithium ion battery negative electrode and a preparation method thereof. Background technique [0002] Traditional lithium-ion batteries have shortcomings such as fast capacity decay, short cycle life, large thickness expansion rate, and easy lithium decomposition during the charging and discharging process, which severely restricts the application of traditional lithium-ion batteries. Contents of the invention [0003] The first purpose of the present invention is to improve the cycle performance of the lithium ion battery, and the present invention provides a negative electrode of the lithium ion battery. [0004] The second object of the present invention is to provide a method for preparing a negative electrode of a lithium ion battery. [0005] The specific technical scheme is as follows: [0006] A lithium ion battery negative electrode, comp...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/04H01M4/13H01M4/139H01M4/36H01M4/38H01M4/583H01M4/62H01M10/0525
CPCH01M4/0404H01M4/13H01M4/139H01M4/362H01M4/386H01M4/583H01M4/62H01M4/621H01M4/624H01M10/0525H01M2004/027Y02E60/10
Inventor 於志锋彭冲李俊义徐延铭
Owner ZHUHAI COSMX BATTERY CO LTD
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