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A kind of lithium-ion battery negative electrode slurry stirring method

A lithium-ion battery and negative electrode slurry technology, which is applied in battery electrodes, secondary batteries, electrode manufacturing, etc., can solve the problems of time-consuming, unstable negative electrode slurry, etc., to improve flexibility, improve slurry consistency, The effect of shortening the stirring time

Active Publication Date: 2022-03-29
CAMEL GRP NEW ENERGY BATTERY CO LTD
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  • Abstract
  • Description
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  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to address the above defects, to provide a lithium ion battery negative electrode slurry stirring method, by controlling the glue addition node, in order to solve the problem in the prior art when a very thin pole piece is coated with a lithium ion battery The negative electrode slurry is unstable and time-consuming, so as to improve the mixing uniformity and efficiency

Method used

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Embodiment Construction

[0023] An embodiment of the method for stirring the negative electrode slurry of a lithium ion battery of the present invention comprises the following steps:

[0024] Add the 100% dry powder in the negative electrode formula to the mixing tank, and start the dry powder mixing; revolution and reverse 10-30rpm, rotation 100-400rpm, stirring time 20-40min;

[0025] Add 29-31% of the total amount of the CMC glue joint formula glue to the mixing tank, and then add an appropriate amount of solvent deionized water to control the solid content of the slurry to 68-75%, and knead and stir the slurry; the revolution speed is from 5rpm to 30min Gradually increase to 25-30rpm within the range and start dispersion, gradually increase the rotation speed from 100rpm to 1000-1400rpm within 30 minutes, and then continue stirring after increasing the rotation speed according to the revolution and rotation, and the stirring time is 80-120min in total;

[0026] After the kneading and stirri...

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Abstract

The title of the present invention is a method for stirring negative electrode slurry of lithium ion battery. It belongs to the technical field of lithium ion batteries. It is mainly to solve the current problem. Its main feature is that it includes the following steps: mixing and stirring the negative electrode formula dry powder; adding a part of the glue to participate in the kneading and stirring of the slurry; adding another part of the glue to participate in the dispersion and stirring of the slurry; adding the remaining part of the glue to participate in the defoaming and stirring of the slurry. The invention can control the negative electrode stirring process time within 5 hours, and the problem of slurry particles can be solved by controlling the solid content point of kneading and stirring. point, to control the viscosity of slurry output and improve the consistency of different batches of slurry. The invention effectively solves the problems of long slurry stirring time, many particles and poor slurry consistency, and is mainly used for stirring the negative electrode slurry of lithium ion batteries.

Description

technical field [0001] The invention belongs to the technical field of lithium ion batteries, and in particular relates to a method for stirring negative electrode slurry of lithium ion batteries. Background technique [0002] Homogenization and stirring is a front-end and important process in the manufacture of lithium-ion batteries. Among them, the stirring of negative electrode slurry has great uncertainty and is difficult to control. At the same time, whether the slurry is homogenized or not will directly affect the later battery production. [0003] In the prior art, the negative electrode slurry is produced by the traditional stirring process, and when a very thin (10 μm) electrode sheet is coated, electrode particles are prone to appear. Generally, it is solved by prolonging the stirring time, or increasing the solid content and time of kneading and stirring to solve the problem of particles prone to appear, but it will also destroy the CMC, resulting in unstable slu...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/62H01M4/04H01M10/0525
CPCH01M4/62H01M4/04H01M10/0525Y02E60/10
Inventor 王海强刘琳张宝华齐明阳
Owner CAMEL GRP NEW ENERGY BATTERY CO LTD
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