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Rapid and efficient lithium ion battery negative electrode homogenate stirring method

A technology of a lithium-ion battery and a stirring method, which is applied in the field of lithium-ion batteries, can solve the problems of easy holding of paddles at high speed, easy overload alarm of motor current, large influence on efficiency and equipment cost, etc.

Pending Publication Date: 2021-08-13
河南克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

Double planetary mixers generally have two sets of high-speed dispersing discs, which can run simultaneously in revolution and rotation. However, when stirring with high viscosity, the high-speed disc is easy to hold the paddle, and the shearing effect is greatly reduced. Easy overload alarm, which has a great impact on the life of the high-speed shaft motor
The three-planetary mixer (without dispersing disc) has no high-speed dispersing disc, and mainly relies on kneading with twist paddles. The dispersing effect is not satisfactory. It often needs to be used with an additional high-speed dispersing machine, which has a great impact on efficiency and equipment cost.

Method used

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  • Rapid and efficient lithium ion battery negative electrode homogenate stirring method
  • Rapid and efficient lithium ion battery negative electrode homogenate stirring method
  • Rapid and efficient lithium ion battery negative electrode homogenate stirring method

Examples

Experimental program
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Effect test

Embodiment 1

[0047] A fast and efficient lithium-ion battery negative electrode homogenate stirring method, comprising the following steps:

[0048] 1) Prepare raw materials according to parts by mass: 100 parts of graphite, 2.0 parts of conductive agent SP, 2.5 parts of styrene-butadiene rubber, 1.5 parts of CMC, 85 parts of water, 1 part of N-methylpyrrolidone; the styrene-butadiene rubber has a solid content of 50 % of styrene-butadiene rubber suspension;

[0049] Stir carboxymethylcellulose sodium (CMC) and deionized water according to the formula ratio to make glue. The glue making process is as follows: first add 80% deionized water, then evenly add the formula amount of CMC, and then the remaining formula amount is 20%. Spray and add deionized water, and stir at 1008rpm while spraying. After 10 minutes of spraying, continue to stir at this speed for a total of 90 minutes, and then stir at 864rpm for 30 minutes. Vacuum degassing treatment, the vacuum degree is - 95kpa to -85kpa, get...

Embodiment 2

[0062] A fast and efficient negative electrode homogenization process for lithium ion batteries, comprising the following steps:

[0063] 1) 1) Prepare each raw material according to parts by mass: 100 parts of graphite, 1.0 parts of conductive agent SP, 2.0 parts of styrene-butadiene rubber, 1.5 parts of CMC, 82 parts of water, 1 part of N-methylpyrrolidone; the styrene-butadiene rubber is Styrene-butadiene rubber suspension with a solid content of 50%;

[0064] Stir carboxymethyl cellulose sodium (CMC) and deionized water according to the formula ratio to make glue. The glue making process is to add 80% deionized water first, add the formula amount of CMC evenly, and then spray the remaining 20% ​​deionized water. Stir at a speed of 1008rpm while spraying. After 10 minutes of spraying, continue to stir at this speed for a total of 90 minutes, then stir at a speed of 864rpm for 30 minutes. The glue is vacuumed and degassed. The vacuum degree is -95kpa to -85kpa. The resultin...

Embodiment 3

[0077] A fast and efficient negative electrode homogenization process for lithium ion batteries, comprising the following steps:

[0078] 1) 1) 1) Prepare raw materials according to parts by mass: 100 parts of graphite, 2.5 parts of conductive agent SP, 2.5 parts of styrene-butadiene rubber, 1.6 parts of CMC, 85 parts of water, 1 part of N-methylpyrrolidone; The rubber is a suspension of styrene-butadiene rubber with a solid content of 50%;

[0079] Stir carboxymethylcellulose sodium (CMC) and deionized water according to the formula ratio to make glue. The glue making process is to add 80% deionized water first, add 100% CMC evenly, and then spray the remaining 20% ​​deionized water. Stir at a speed of 1008rpm while spraying. After 10 minutes of spraying, continue to stir at this speed, and then stir at a speed of 864rpm for 30 minutes. The glue is vacuumed and degassed. The glue solution is divided into four parts, namely A, B, C and D, accounting for 51%, 10%, 9% and 30% r...

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Abstract

The invention provides a rapid and efficient lithium ion battery negative electrode homogenate stirring method. The method comprises the following steps: 1) adding a glue solution into powder while stirring; 2) continuing to add the glue solution, and stirring; (3) adding the glue solution and N-methyl pyrrolidone, and stirring; and 4) adding the butadiene styrene rubber, then adding the rest of the glue solution, and stirring. Compared with the prior art, the glue solution is divided into four parts, the mixing sequence of each step and the amount of the added glue solution are controlled, and the stirring speed and time of each step are controlled, so that uniform dispersion of the slurry is facilitated, and the fineness, stability and rheological property of the slurry and the cycle performance of a battery cell are improved.

Description

technical field [0001] The invention relates to the field of lithium ion batteries, in particular to a fast and efficient method for homogenizing and stirring negative electrodes of lithium ion batteries. Background technique [0002] Lithium-ion batteries have the advantages of high energy density, high cycle times, low self-discharge, low pollution, and no memory effect. Based on its advantages, since the invention of lithium-ion batteries, it has been widely used in all aspects of life, such as smartphones, automotive power batteries, smart wearable devices, small power batteries, PT products, etc., and has become the most widely used secondary battery. Battery. [0003] The most critical process of lithium-ion battery production is the production of slurry. At present, there are various equipment for slurry production, but the market is still dominated by double-planetary agitators and three-planetary agitators (without dispersing discs). Double planetary mixers genera...

Claims

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Application Information

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IPC IPC(8): B01F13/10H01M4/04H01M10/0525
CPCH01M4/04H01M10/0525B01F33/80B01F33/834Y02E60/10
Inventor 郝世伟李洪涛李少刚柯克王红伟
Owner 河南克能新能源科技有限公司
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