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Lithium ion battery negative electrode capable of improving high-voltage cycle performance and preparation method thereof

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

Active Publication Date: 2019-10-11
ZHUHAI COSMX BATTERY CO LTD
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  • Summary
  • Abstract
  • 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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  • Lithium ion battery negative electrode capable of improving 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, and the long paste layer is gap-coated on the negative electrode collector On one surface of the fluid, the short paste layer is gap-coated on the other surface of the negative electrode current collector, and the long paste layer is composed of negative electrode main material, high specific surface area conductive agent, CMC and SBR according to 96.1% to 97.3 %: 0.5% to 1.0%: 1.2% to 1.5%: 1.0% to 1.4% by mass percentage, the short paste layer is composed of negative electrode main material, silicon carbon, CMC and SBR according to 96.1% to 97.3%: 0.5% ~1.0%: 1.2%~1.5%: 1.0%~1.4% by mass percentage composition.

[0023] Further, the specific surface area range of the high specific surface area conductive agent is 180 ...

specific Embodiment approach 2

[0025] A method for preparing a negative electrode of a lithium-ion battery that improves high-voltage cycle performance, comprising the following steps:

[0026] Step 1: Evenly disperse the negative electrode main material with a mass percentage of 96.1% to 97.3%, 0.5% to 1.0% of a high specific surface area conductive agent, 1.2% to 1.5% of CMC and 1.0% to 1.4% of SBR in a solvent for deionization 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, and the coating thickness is 160um-250um;

[0027] Step 2: Uniformly disperse the negative electrode main material with a mass percentage of 96.1% to 97.3%, 0.5% to 1.0% of silicon carbon, 1.2% to 1.5% of CMC and 1.0% to 1.4% of SBR in deionized water as a solvent. Negative electrode slurry B, coating the negative electrode slurry B on the short pasted surface of the negative electrode current collector, the coating thick...

specific Embodiment approach 3

[0032] A method for preparing a negative electrode of a lithium-ion battery that improves high-voltage cycle performance described in the specific embodiment 2, in step 1: the specific configuration method of the negative electrode slurry A is: (1) the total mass of the CMC 15%~65% and all of the high specific surface area conductive agent are pre-mixed and uniformly dispersed in solvent deionized water; (2) Then add 20%~30% of the total mass of the negative electrode main material and 20% of the total mass of the CMC 5%~15%, uniformly dispersed; (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, uniformly dispersed; (4) then add the 25% to 30% of the total mass of the negative electrode main material and 5% to 75% of the total mass of the CMC are uniformly dispersed; (5) then 10% to 30% of the total mass of the negative electrode main material is added to uniformly disperse; ( 6) In the last step, add all th...

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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 in particular relates to a lithium-ion battery negative electrode with improved high-voltage cycle performance and a preparation method thereof. Background technique [0002] In the process of charging and discharging, high-voltage lithium-ion batteries have the disadvantages of 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. Contents of the invention [0003] The purpose of the present invention is to improve the cycle performance of high-voltage lithium-ion batteries and reduce the risk of lithium precipitation on the paste-coated surface of the negative electrode. The present invention provides a preparation method of lithium-ion batteries with improved high-voltage cycle performance. [0004] In order to achieve the above object, the technical schem...

Claims

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Application Information

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Patent Type & Authority Applications(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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