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Paste homogenizing and stirring process for lithium ion battery negative electrode

A lithium-ion battery and anode slurry technology, which is applied in battery electrodes, electrode manufacturing, secondary batteries, etc., can solve the problems of low battery cycle life and high cost of negative electrodes, improve equipment utilization, improve cycle life, and shorten completion. effect of time

Pending Publication Date: 2017-12-19
SHENZHEN BAK POWER BATTERY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a lithium-ion battery negative electrode homogenate stirring process, aiming at solving the problems of high cost and low battery cycle life of the lithium-ion battery negative electrode prepared by the existing method

Method used

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  • Paste homogenizing and stirring process for lithium ion battery negative electrode
  • Paste homogenizing and stirring process for lithium ion battery negative electrode
  • Paste homogenizing and stirring process for lithium ion battery negative electrode

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] A preparation method of lithium ion battery negative electrode slurry, comprising the following steps:

[0044] Weigh the raw material components of the lithium ion battery negative electrode, the raw material components include graphite powder, conductive agent, CMC, SBR and water, and the mass ratio of graphite powder, conductive agent, CMC, SBR and water is 100:2.5 :1:3:85;

[0045] Put the graphite powder and the conductive agent into a dry mixing tank, stir for 15 minutes at a revolution speed of 5 rpm and a rotation speed of 100 rpm to prepare a powder; after mixing the CMC and the water, first Stir 90min under the rotating speed of 864rpm, then stir 30min under the condition of 864rpm, prepare CMC glue;

[0046] Put the powder in a mixer, add the CMC glue with a mass percentage of 8% to the powder, stir for 10 min at a revolution speed of 10 rpm and a rotation speed of 800 rpm, and mix the powder The material is wetted to obtain the first mixed material;

[00...

Embodiment 2

[0052] A preparation method of lithium ion battery negative electrode slurry, comprising the following steps:

[0053] Weigh the raw material components of the lithium ion battery negative electrode, the raw material components include graphite powder, conductive agent, CMC, SBR and water, and the mass ratio of graphite powder, conductive agent, CMC, SBR and water is 100:2.5 :1.5:3.5:90;

[0054] Put the graphite powder and the conductive agent into a dry mixing tank, stir for 13 minutes at a revolution speed of 5 rpm and a rotation speed of 103 rpm to prepare powder; after mixing the CMC and the water, first Stir 95min under the rotating speed of 850rpm, then stir 30min under the condition of 850rpm, prepare CMC glue;

[0055] The powder is placed in a mixer, the CMC glue with a mass percentage of 9% is added to the powder, stirred for 10 min at a revolution speed of 9.5 rpm and a rotation speed of 805 rpm, and the Wetting the powder to obtain the first mixture;

[0056] A...

Embodiment 3

[0061] A preparation method of lithium ion battery negative electrode slurry, comprising the following steps:

[0062] Weigh the raw material components of the lithium ion battery negative electrode, the raw material components include graphite powder, conductive agent, CMC, SBR and water, and the mass ratio of graphite powder, conductive agent, CMC, SBR and water is 100:2 :1:3.2:90;

[0063] Put the graphite powder and the conductive agent into a dry mixing tank, stir for 14min at a revolution speed of 5rpm and a rotation speed of 102rpm to prepare powder; after mixing the CMC and the water, first Stir for 88min under the rotating speed of 88min, then stir 28min under the condition of 880rpm, prepare CMC glue;

[0064] The powder is placed in a mixer, the CMC glue with a mass percentage of 10% is added to the powder, stirred for 11 min at a revolution speed of 10.5 rpm and a rotation speed of 798 rpm, and the Wetting the powder to obtain the first mixture;

[0065] Add the...

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Abstract

The invention provides a preparation method for lithium ion battery negative paste. The preparation method at least comprises the following steps of providing a raw material constituent of a lithium ion battery negative electrode, pre-dispersing the raw material constituent by an agitator to obtain pre-dispersion paste; and performing high-speed dispersing on the pre-dispersion paste by employing high-speed dispersing equipment at a speed larger than or equal to 2,500rpm to obtain the negative paste.

Description

technical field [0001] The invention belongs to the technical field of lithium ion battery preparation, and in particular relates to a lithium ion battery negative electrode homogenate stirring process. Background technique [0002] Power lithium-ion battery is the heart of electric vehicles, and its development plays a key role in the performance of electric vehicles. In recent years, my country's new energy automobile industry has developed rapidly, but the cost and cycle life of power lithium-ion batteries have become a bottleneck restricting the promotion and popularization of new energy production capacity. [0003] The manufacturing process of lithium-ion batteries usually includes four steps: pulping, coating, assembly, and formation. As the pulping process at the source of preparation, the quality of the homogenizing and stirring process plays a decisive role in the subsequent coating film and the performance of the final finished battery. At present, the anode hom...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/04H01M4/1393H01M10/0525
CPCH01M4/04H01M4/1393H01M10/0525Y02E60/10
Inventor 李东亮
Owner SHENZHEN BAK POWER BATTERY CO LTD
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