Novel lithium ion battery homogenizing and stirring process

A technology of lithium-ion battery and stirring process, which is applied to battery electrodes, secondary batteries, circuits, etc. It can solve the problems of slurry viscosity influence, poor solid content of slurry, and impact on the performance and service life of finished batteries, so as to improve performance And service life, not easy to drop powder, shorten the effect of batching time

Active Publication Date: 2014-12-10
ZHEJIANG CASNOVO MATERIALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The current mixing process mostly adopts wet mixing. Wet mixing is a traditional beating method. First, the colloid is prepared, and then conductive carbon and electrode materials are added one by one. The whole process of wet mixing is carried out in a vacuum state. , so that the stability of the solid content of the slurry is poor, and it also affects the viscosity of the slurry, which directly affects the performance and service life of the finished battery

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Embodiment 1: novel lithium ion battery homogenization stirring process, the total dry powder after fully mixing 3 parts of conductive carbon powder, 94 parts of active material lithium iron phosphate, 3 parts of binder PVDF is put into a mixer and stirred by mass parts, so The described conductive carbon powder, lithium iron phosphate and binder PVDF (binder polyvinylidene fluoride) are all conventional raw materials in the art, and can be directly sold from the market, so these three raw materials will not be repeated; the specific stirring process as follows;

[0023] a. Dry powder stirring; stirring for 15 minutes at a dispersing speed of 800 rpm and a stirring speed of 45 rpm;

[0024] b. Muddy stirring; 50% solvent N-methylpyrrolidone of the total dry powder mass is added to the mixer, firstly stirring for 5 minutes at a dispersing speed of 900 rpm and a stirring speed of 10 rpm; then at a dispersing speed of 2000 rpm / min and stirring speed of 60 r / min for...

Embodiment 2

[0028] Embodiment 2: novel lithium ion battery homogenization stirring process, the total dry powder after fully mixing 5 parts of conductive carbon powder, 95 parts of active material lithium iron phosphate, 3 parts of binder PVDF is put into a mixer and stirred by mass parts. The stirring process is as follows;

[0029] a. Dry powder stirring; stirring for 15 minutes at a dispersion speed of 500 rpm and a stirring speed of 40 rpm;

[0030] b. Muddy stirring; 50% solvent N-methylpyrrolidone of the total dry powder mass is added to the mixer, firstly stirring for 5 minutes at a dispersing speed of 900 rpm and a stirring speed of 10 rpm; then at a dispersing speed of 2000 rpm / min and stirring speed of 60 r / min for 10 minutes; then stir for 60 minutes at dispersing speed of 3200 r / min and stirring speed of 100 r / min; the stirring speed of this step changes from slow to fast, and the stirring process should be paused every 15min Scraping once, a total of 2 times; since th...

Embodiment 3

[0034] Embodiment 3: Novel lithium ion battery homogenization stirring process, by mass, 1 part of conductive carbon powder, 90 parts of active material lithium iron phosphate, 2 parts of binder PVDF, please list the type and mix of the dry powder put into the mixer at first. ratio relationship) the fully mixed total dry powder is put into the mixer for mixing, and the specific mixing process is as follows;

[0035] a. Dry powder stirring; stirring for 15 minutes at a dispersing speed of 1000 rpm and a stirring speed of 40 rpm;

[0036] b. Muddy stirring; 50% solvent N-methylpyrrolidone of the total dry powder mass is added to the mixer, firstly stirring for 5 minutes at a dispersing speed of 900 rpm and a stirring speed of 10 rpm; then at a dispersing speed of 2000 rpm / min and stirring speed of 60 r / min for 10 minutes; then stir for 60 minutes at dispersing speed of 3200 r / min and stirring speed of 100 r / min; the stirring speed of this step changes from slow to fast, a...

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Abstract

The invention discloses a novel lithium ion battery homogenizing and stirring process. The novel lithium ion battery homogenizing and stirring process comprises the following steps: feeding total dry powder prepared by fully mixing 1-5 parts by mass of conductive carbon powder, 90-100 parts by mass of an active substance-lithium iron phosphate, and 1-5 parts by mass of an adhesive-PVDF into a stirrer, sequentially stirring the dry powder so as to be in a paste manner, stirring the slurry, stirring with high viscosity, stirring by adjusting the viscosity so as to slurry and carrying out vacuum defoamation on the slurry. By virtue of the novel lithium ion battery homogenizing and stirring process, the content of solid in the slurry can be greatly increased; the slurry viscosity can be improved; the mixing time can be shortened; finally, the performance of the lithium ion battery can be greatly improved and the service life of the lithium ion battery can be greatly prolonged.

Description

[0001] technical field [0002] The invention relates to a lithium ion battery homogenate stirring process, which belongs to the field of lithium ion battery production. Background technique [0003] The homogenization and mixing process is an important step in the production of lithium batteries in the lithium battery industry. The quality of the homogenization determines the quality of the later coating and the final battery performance. The current mixing process mostly adopts wet mixing. Wet mixing is a traditional beating method. First, the colloid is prepared, and then conductive carbon and electrode materials are added one by one. The whole process of wet mixing is carried out in a vacuum state. , so that the stability of the solid content of the slurry is poor, and it also affects the viscosity of the slurry, which directly affects the performance and service life of the finished battery. With the continuous development of the lithium battery industry, the requireme...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/04H01M4/1397
CPCH01M4/04H01M4/1397H01M10/0525Y02E60/10
Inventor 邵汉琦江舟焦书仁张灵志夏旭明刘俊杰周峰
Owner ZHEJIANG CASNOVO MATERIALS
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