Lithium ion battery anode plate containing conductive coating

A lithium-ion battery and conductive coating technology, applied in battery electrodes, negative electrodes, secondary batteries, etc., can solve the problems of poor adhesion of negative active materials, unresolved cycle performance, uneven dispersion of slurry particles, etc. , to achieve the effect of improving dispersion effect, increasing cycle performance and low friction coefficient

Inactive Publication Date: 2019-10-22
江西力能新能源科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the smooth surface of the light foil, the interface binding force between the negative electrode active material and the current collector is weak when coating, resulting in poor adhesion of the negative electrode active material, which is prone to problems such as electrode sheet dropout in the later process, and the cycle Poor performance, uneven dispersion of slurry particles, reducing battery energy density
[0003] Application No. 201710219433.X discloses a lithium-ion battery negative electrode sheet containing a conductive coating, which increases the viscosity and reduces the impedance of the electrode sheet, but the problem of cycle performance has not been solved, and the particles are dispersed unevenly, which reduces the battery energy. density

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] The present invention proposes a lithium ion battery negative electrode sheet containing a conductive coating. The negative electrode slurry is coated on the surface of the conductive coating. The raw materials of the negative electrode slurry are 40 parts of graphite, 30 parts of sodium hydroxymethyl cellulose and styrene-butadiene rubber. 15 parts, stir and mix the ionized water with the negative electrode weight ratio of 1:1 with the negative electrode raw materials to obtain a mixed solution, add 15 parts of conductive agent (conductive agent is conductive carbon black) to the mixed solution and stir clockwise at low speed for 10 minutes, then counterclockwise at low speed Stir for 10 minutes to obtain the first mixture, then add 10 parts of thickener (the main component on the market is carboxymethyl cellulose) in the first mixture and stir clockwise at low speed for 10 minutes, then counterclockwise at low speed for 10 minutes, the stirring speed is 200 rpm to make...

Embodiment 2

[0024] Optimizing on the basis of Example 1, put 55 parts of polytetrafluoroethylene, 45 parts of graphite, 5 parts of silver-plated copper powder, and 5 parts of chromium trioxide into the grinder for wet grinding for 1 hour. After grinding, place Dry in an oven to make a conductive coating, grind the graphite to small particles, which can increase the current charging and discharging performance, and increase the service life. The conductive coating is coated on the surface of the copper foil of the current collector. After all coating is completed, Dry to make battery negative electrode sheet.

Embodiment 3

[0026] Optimized on the basis of Example 2, put 55 parts of polytetrafluoroethylene, 45 parts of graphite, 30 parts of magnesium powder, 5 parts of silver-plated copper powder, and 5 parts of chromium trioxide into the grinder for wet grinding for 1 hour, After grinding, place it in an oven for drying to form a conductive coating. Grind the graphite to small particles, which can increase the current charging and discharging performance and increase the service life. Apply the conductive coating to the surface of the copper foil of the current collector. After the coating is completed, it is dried to make a negative electrode sheet of the battery.

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Abstract

The invention discloses a lithium ion battery anode plate containing a conductive coating. The lithium ion battery anode plate comprises a negative current collector and a conductive coating used forcoating the negative current collector, wherein the conductive coating is coated with anode slurry. The manufacturing process of the anode slurry comprises the steps of: 1) taking the anode slurry rawmaterials as graphite, sodium hydroxymethyl cellulose and styrene butadiene rubber, and stirring and mixing the anode slurry raw materials with ionized water according to the weight ratio of 1:1 to obtain a mixed solution; 2) adding a conductive agent into the mixed solution obtained in the step 2 for low-speed stirring to obtain a first mixed material; and 3) adding a thickening agent into the first mixed material obtained in the step 2, and stirring the mixture at a low speed to prepare the anode slurry. According to the invention, the conductive coating is coated between the current collector and the anode slurry, so that the viscosity of the pole piece is improved, and the conductivity is enhanced.

Description

technical field [0001] The invention relates to the technical field of lithium batteries, in particular to a lithium ion battery negative electrode sheet containing a conductive coating. Background technique [0002] At present, the negative electrode sheets of lithium-ion batteries generally include a current collector and a negative electrode active material coated on the current collector. The current collector of the negative electrode is mainly made of copper foil and light foil. Due to the smooth surface of the light foil, the interface binding force between the negative electrode active material and the current collector is weak when coating, resulting in poor adhesion of the negative electrode active material, which is prone to problems such as electrode sheet dropout in the later process, and the cycle Poor performance and uneven dispersion of slurry particles reduces the energy density of the battery. [0003] Application No. 201710219433.X discloses a lithium-ion...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/62H01M4/133H01M4/1393H01M10/0525G01B11/06
CPCG01B11/0616H01M4/133H01M4/1393H01M4/624H01M4/628H01M10/0525H01M2004/027Y02E60/10
Inventor 侯伟侯民郭农庆
Owner 江西力能新能源科技有限公司
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