A kind of negative electrode slurry of lithium battery and preparation method thereof

A negative electrode slurry and lithium battery technology, which is applied in the direction of battery electrodes, negative electrodes, secondary batteries, etc., can solve the problems of insufficient flexibility and stability of negative electrode slurry, short cycle life of negative electrode sheets, etc., and achieve low cost and device Simple, thickening and stabilizing effect

Active Publication Date: 2022-05-13
WANXIANG 123 CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In order to overcome the problem of insufficient flexibility and stability of the negative electrode slurry in the prior art and the short cycle life of the negative electrode sheet, the present invention provides a negative electrode slurry for a lithium battery and a preparation method thereof. The viscosity of the negative electrode slurry is Moderate density, good stability, simple preparation method, low cost, long cycle life of the negative electrode sheet made of the negative electrode slurry

Method used

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  • A kind of negative electrode slurry of lithium battery and preparation method thereof
  • A kind of negative electrode slurry of lithium battery and preparation method thereof
  • A kind of negative electrode slurry of lithium battery and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0043] Such as figure 1 As shown in the preparation process of the negative electrode slurry, the preparation process of the negative electrode slurry is as follows:

[0044] A. Deionized water enters the ultraviolet disinfection system at a water flow rate of 60L / min. After ultraviolet disinfection, add carboxymethyl cellulose, citric acid and hydroxypropyl guar gum to the deionized water, stir until they are completely dissolved, and then add 20nm aminocellulose and polystyrene butadiene copolymer, stir and mix evenly to obtain a mixed binder solution, carboxymethylcellulose, citric acid, hydroxypropyl guar gum, 20nm aminocellulose, polystyrene The mass ratio of ethylene butadiene copolymer to deionized water is 3:2:2:0.5:10:83;

[0045] B. Add artificial graphite, carbon nanotubes, mixed binder to deionized water after ultraviolet disinfection, and stir evenly. The mass ratio of artificial graphite, carbon nanotubes, mixed binder and water is 18:1:1:18 ;

[0046] C. Add ...

Embodiment 2

[0048] A. Deionized water enters the ultraviolet disinfection system at a water flow rate of 60L / min. After ultraviolet disinfection, add carboxymethyl cellulose, citric acid and natural guar gum to the deionized water, stir until they are completely dissolved, and then add 20nm Aminocellulose and polystyrene butadiene copolymer, stir and mix evenly to obtain a mixed binder solution, carboxymethylcellulose, citric acid, natural guar gum, 20nm aminocellulose, polystyrene butadiene The mass ratio of copolymer to deionized water is 3:2:2:0.5:10:83;

[0049] B. Add artificial graphite, carbon nanotubes, mixed binder to deionized water after ultraviolet disinfection, and stir evenly. The mass ratio of artificial graphite, carbon nanotubes, mixed binder and water is 18:1:1:18 ;

[0050] C. Add phosphoric acid to adjust the pH value of the slurry to 6.

Embodiment 3

[0052] A. Deionized water enters the ultraviolet disinfection system at a water flow rate of 60L / min. After ultraviolet disinfection, add carboxymethyl cellulose, citric acid and cationic guar gum to the deionized water, stir until they are completely dissolved, and then add 20nm Aminocellulose and polystyrene butadiene copolymer, stir and mix evenly to obtain a mixed binder solution, carboxymethylcellulose, citric acid, cationic guar gum, 20nm aminocellulose, polystyrene butadiene The mass ratio of copolymer to deionized water is 3:2:2:0.5:10:83;

[0053] B. Add artificial graphite, carbon nanotubes, mixed binder to deionized water after ultraviolet disinfection, and stir evenly. The mass ratio of artificial graphite, carbon nanotubes, mixed binder and water is 18:1:1:18 ;

[0054] C. Add phosphoric acid to adjust the pH value of the slurry to 6.

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Abstract

The invention relates to the field of negative electrode slurry for lithium batteries. In order to solve the problem of insufficient flexibility and stability of the negative electrode slurry in the prior art and the short cycle life of the negative electrode sheet, a negative electrode slurry for lithium batteries is disclosed. Its preparation method, the negative electrode slurry includes the following components by mass: 85-90 parts of active material, 3-6 parts of conductive agent, 2-5 parts of mixed binder and 90-235 parts of deionized water, the negative electrode slurry The pH value is 6-9; the preparation steps are as follows: add carboxymethylcellulose, citric acid and crosslinking agent to deionized water, stir at room temperature, then add aminocellulose and polystyrene butadiene copolymer and stir, Obtaining a mixed binder solution; mixing the active material, the conductive agent, the mixed binder and deionized water; adjusting the pH of the slurry. The negative electrode slurry in the invention has good viscosity and stability, and the prepared negative electrode sheet is not easy to crack and fall off, has a long cycle life, simple preparation steps, simple device and low cost.

Description

technical field [0001] The invention relates to the field of lithium battery negative electrode slurry, in particular to a lithium battery negative electrode slurry and a preparation method thereof. Background technique [0002] Lithium battery is an important part of new energy development. The negative electrode slurry of lithium battery is composed of active material, conductive agent and binder. At present, the binder used in the production process of lithium battery is divided into two types: oil-soluble binder and water-based binder. Among them, oil-soluble binder The dispersant of the adhesive is an organic reagent, which is not friendly to the environment and has the risk of explosion, while the water-based adhesive uses water as the dispersant, which is safer. Water-soluble carboxymethyl cellulose is commonly used as a binder in water-based binders, and carboxymethyl cellulose can be extracted from plants with low cost. However, carboxymethyl cellulose is easily d...

Claims

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Application Information

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Patent Type & AuthorityPatents(China)
IPC IPC(8): H01M4/62H01M4/583H01M10/0525
CPCH01M4/621H01M4/624H01M4/583H01M10/0525H01M2004/027Y02E60/10
Inventor宫娇娇陈军黄建根郑利峰
OwnerWANXIANG 123 CO LTD