A lithium-ion battery negative electrode with improved high-voltage cycle performance and preparation method thereof

A lithium-ion battery, cycle performance technology, applied in non-aqueous electrolyte battery electrodes, battery electrodes, electrode manufacturing, etc., can solve the problems of large thickness expansion rate, application limitations of high-voltage lithium-ion batteries, short cycle life, etc., to improve Polarization effect, the effect of reducing the risk of lithium precipitation, and improving the cycle performance

Active Publication Date: 2020-11-27
ZHUHAI COSMX BATTERY CO LTD
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  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] In the process of charging and discharging, high-voltage lithium-ion batteries have shortcomings such as fast capacity decay, short cycle life, large thickness expansion rate, and easy lithium analysis, which severely restricts the application of high-voltage lithium-ion batteries.

Method used

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  • A lithium-ion battery negative electrode with improved high-voltage cycle performance and preparation method thereof

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specific Embodiment approach 1

[0022] A lithium-ion battery negative electrode for improving high-voltage cycle performance, comprising a negative electrode current collector and a negative electrode coating. The negative electrode coating includes a long paste layer and a short paste layer. The long paste layer gap is coated on the negative electrode collector. On one surface of the fluid, the short coating layer gap is coated on the other surface of the negative electrode current collector. The long coating layer is composed of the negative electrode main material, the high specific surface area conductive agent, CMC and SBR in accordance with 96.1%-97.3 %: 0.5% to 1.0%: 1.2% to 1.5%: 1.0% to 1.4% by mass, the short coating paste layer is composed of the negative electrode main material, silicon carbon, CMC and SBR in accordance with 96.1% to 97.3%: 0.5% ~1.0%: 1.2%~1.5%: 1.0%~1.4% mass percentage composition.

[0023] Further, the specific surface area of ​​the high specific surface area conductive agent ra...

specific Embodiment approach 2

[0025] A preparation method of lithium ion battery negative electrode with improved high-voltage cycle performance includes the following steps:

[0026] Step 1: Disperse 96.1%-97.3% of the main negative electrode material, 0.5%-1.0% high specific surface area conductive agent, 1.2%-1.5% CMC and 1.0%-1.4% SBR in the solvent deionization. A negative electrode slurry A is made in water, and the negative electrode slurry A is coated on the long paste surface of the negative electrode current collector with a coating thickness of 160-250μm;

[0027] Step 2: Disperse the negative main material of 96.1%-97.3% by mass, 0.5%-1.0% silicon carbon, 1.2%-1.5% CMC and 1.0%-1.4% SBR uniformly in solvent deionized water. Negative electrode slurry B, coating the negative electrode slurry B on the short paste surface of the negative electrode current collector with a coating thickness of 160-250μm;

[0028] Step 3: The negative electrode current collector coated with negative electrode slurry A and ...

specific Embodiment approach 3

[0032] In the second embodiment, a method for preparing a negative electrode of a lithium ion battery with improved high-voltage cycle performance is described. In step one: the specific configuration method of the negative electrode slurry A is: (1) the total mass of the CMC 15% to 65% and all of the high specific surface area conductive agents are pre-mixed and uniformly dispersed in the solvent deionized water in advance; (2) Then add 20% to 30% of the total mass of the negative electrode main material and the total mass of the CMC 5%-15%, uniform dispersion; (3) then add 25%-30% of the total mass of the negative electrode main material and 5%-15% of the total mass of the CMC, uniform dispersion; (4) then add the 25%-30% of the total mass of the main material of the negative electrode and 5%-75% of the total mass of the CMC, uniformly dispersed; (5) Then add 10%-30% of the total mass of the negative main material to make the dispersion uniform; 6) In the last step, all the S...

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Abstract

The invention discloses a lithium ion battery negative electrode for improving high-voltage cycle performance and a preparation method thereof, and belongs to the technical field of lithium ion batteries. The specific scheme is that the negative electrode comprises a negative electrode current collector and a negative electrode coating; the negative electrode coating comprises a long paste coatinglayer and a short paste coating layer; one surface of the negative electrode current collector is coated with the long paste coating layer in a spaced mode, and the other surface of the negative electrode current collector is coated with the short paste coating layer in a spaced mode; and the negative electrode paste of the long paste coating layer and the negative electrode paste of the short paste coating layer are different. According to the invention, through employing two coating processes, the two sides of the negative current collector are respectively coated with different types of negative slurry to control the liquid absorption performance and the dynamic performance of a long paste coating layer and a short paste coating layer of a negative pole piece of the high-voltage battery; and particularly, the polarization effect between the long paste coating layer and the negative electrode current collector is improved, so that the cycle performance of the high-voltage battery isimproved, and the lithium precipitation risk of the negative electrode single paste coating layer is reduced.

Description

Technical field [0001] The invention belongs to the technical field of lithium batteries, and specifically relates to a lithium ion battery negative electrode for improving high-voltage cycle performance and a preparation method thereof. Background technique [0002] High-voltage lithium-ion batteries have shortcomings such as fast capacity decay, short cycle life, large thickness expansion, and easy lithium evolution during charge and discharge, which severely restrict the application of high-voltage lithium-ion batteries. Summary of the invention [0003] The purpose of the present invention is to improve the cycle performance of a high-voltage lithium ion battery and reduce the risk of lithium evolution on the negative electrode coating surface. The present invention provides a method for preparing a lithium ion battery with improved high-voltage cycle performance. [0004] In order to achieve the above objectives, the technical solutions adopted by the present invention are as f...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/04H01M4/62H01M4/13H01M4/139H01M10/0525
CPCH01M4/0404H01M4/13H01M4/139H01M4/62H01M4/625H01M10/0525Y02E60/10
Inventor 於志锋李俊义彭冲徐延铭
Owner ZHUHAI COSMX BATTERY CO LTD
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