Method for efficiently preparing positive and negative electrode paste

A technology of electrode slurry and positive electrode slurry, which is applied to battery electrodes, circuits, electrical components, etc., can solve problems such as product quality differences, unreasonable coordination, and restrictions on lithium battery production efficiency, and achieve improved performance, high capacity, and long life. The effect of cycle life

Active Publication Date: 2014-03-19
SHANDONG GOLDENCELL ELECTRONICS TECH
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Problems solved by technology

Although the lithium batteries of domestic enterprises are developing rapidly, the quality of their products is somewhat different from that of foreign countries. This is mainly due to the influence of technology and equipment. Therefore, improving the production process of lithium batteries is beneficial to improve production efficiency

Method used

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  • Method for efficiently preparing positive and negative electrode paste
  • Method for efficiently preparing positive and negative electrode paste
  • Method for efficiently preparing positive and negative electrode paste

Examples

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Embodiment 1

[0015] Positive electrode slurry preparation: lithium iron phosphate LiFePO 4 The active material, carbon black SP and conductive graphite KS-6 conductive agent are mixed in a three-dimensional mixer. The mixing time is 2 hours and the frequency is set to 30Hz. Tetrafluoroethylene (PVDF) was added into the nitrogen methyl pyrrolidone (NMP) solvent to stir and dissolve. The automatic feeding mixer had a rotation speed of 500 rpm and a revolution speed of 10 rpm. After stirring for 0.5 hours, vacuumize. The vacuum value is -0.05Mpa, and the rotation and revolution speeds are increased to 1500 rpm and 25 rpm respectively, and the stirring time is 2 hours. Slowly add the uniformly mixed positive electrode powder into the automatic feeding mixer along the feeding port. In the mixing tank, the addition is completed within 30 minutes. At the same time, the rotation and revolution speed of the mixer are adjusted to 500 rpm and the revolution speed is 10 rpm, that is, stirring while fe...

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Abstract

The invention relates to a method for efficiently preparing positive and negative electrode paste. The preparation of positive electrode paste comprises the following steps: mixing a positive electrode active substance and a conductive agent in a three-dimensional mixing machine, adding a binder (PVDF: polyvinylidene fluoride) into a N-methyl pyrrolidone (NMP) solution for stirring and dissolving by utilizing an automatic loading and stirring machine, performing vacuum pumping, finally slowly adding positive electrode powder which is uniformly mixed into a stirring tank of the automatic loading and stirring machine along a feed port of the automatic loading and stirring machine, further performing vacuum pumping after the adding of the material is completed, and controlling the temperature in the whole process of gluing and paste combination at 20-45 DEG C. The preparation of negative electrode paste comprises the following steps: placing a negative electrode active substance and the conductive agent into the three-dimensional mixing machine for mixing, adding sodium carboxymethyl cellulose (CMC) into deionized water (H2O) for stirring and dissolving by utilizing the automatic loading and stirring machine, and controlling the temperature in the whole process of gluing and paste combination at 20-45 DEG C.

Description

technical field [0001] The invention relates to a method for efficiently preparing lithium ion battery slurry, in particular to a method for efficiently preparing positive and negative electrode slurry. Background technique [0002] At present, the production and development of lithium-ion batteries at home and abroad have become an upsurge. The total output of batteries in my country has occupied the forefront of the world. Among them, domestic lithium battery representative companies include Tianjin Lishen, Shenzhen BAK, Shenzhen Bangkai, BYD, and Hefei Guoxuan. , Dongguan New Energy (ATL), etc. Although the lithium batteries of domestic enterprises are developing rapidly, the quality of their products is somewhat different from that of foreign countries. This is mainly due to the influence of technology and equipment. Therefore, improving the production process of lithium batteries is beneficial to improve production efficiency. [0003] Lithium battery mixing process oc...

Claims

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Application Information

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IPC IPC(8): H01M4/62H01M4/58
CPCH01M4/139H01M4/364H01M4/5825H01M10/0525Y02E60/10
Inventor 关成善宗继月李涛杜莉莉单传省
Owner SHANDONG GOLDENCELL ELECTRONICS TECH
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