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Preparation method of negative electrode slurry

A negative electrode slurry and slurry technology, which is applied in the field of negative electrode slurry preparation, can solve the problems of easy agglomeration of slurry, influence on battery assembly and use, poor battery consistency, etc., and achieve convenient transfer and good Dispersion effect, effect of ensuring consistency

Pending Publication Date: 2020-06-05
成都格力钛新能源有限公司 +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, most of the current processes still use the high-speed dispersion method to prepare the negative electrode slurry. The slurry prepared by this process is easy to agglomerate and the uniformity of the slurry is not good, so that the consistency of the lithium-ion battery prepared by using this slurry is poor, which affects Assembly and use of batteries

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  • Preparation method of negative electrode slurry
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preparation example Construction

[0029] A preparation method of negative electrode slurry, comprising the following steps:

[0030] Step 1: mixing and stirring the negative electrode active material, the conductive agent, the thickener and the solvent to form a mixture I;

[0031] Step 11: Mix the negative electrode active material, conductive agent and thickener, and stir at a speed of 18-22rpm and disperse at a speed of 400-800rpm for 10-20min to form a mixture a; wherein, the negative electrode active material is natural graphite, Artificial graphite, soft carbon, hard carbon or silicon-carbon composite materials; the conductive agent is carbon nanotubes, graphene, acetylene black, Ketjen black or conductive carbon black. The thickener is sodium carboxymethyl cellulose.

[0032] Step 12: Add solvent to mixture a, and stir at a speed of 13-17rpm for 15-25min, then stir at a speed of 18-22rpm and disperse at a speed of 400-800rpm for 40-50min to form mixture b; the solvent is Deionized water.

[0033] Ste...

specific Embodiment 1

[0041] Step 1: Put 97 parts of graphite, 1 part of carbon nanotubes and 1 part of sodium carboxymethylcellulose into the stirring tank 1, mix and stir at a speed of 20 rpm and disperse at a speed of 500 rpm for 15 minutes to form a mixture a; Add 22 parts of deionized water to mixture a and stir at a speed of 15 rpm for 20 minutes, then stir at a speed of 20 rpm and disperse at a speed of 500 rpm for 45 minutes to form mixture b; slurry, and added 58 parts of deionized water to the mixture b again and first stirred at a speed of 15 rpm for 15 minutes, and then dispersed at a speed of 20 rpm and a speed of 700 rpm for 30 minutes to obtain a mixture I.

[0042] Step 2: Transport the mixture I in the stirring tank 1 to the ultrasonic tank 2 through the first diaphragm pump 3, and perform ultrasonic treatment for 30 minutes.

[0043] Step 3: Transport the ultrasonically treated mixture I in the ultrasonic tank 2 to the stirring tank 1 through the second diaphragm pump 4, and add s...

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Abstract

The invention relates to a preparation method of negative electrode slurry, and the method comprises the following steps: step 1, mixing a negative electrode active substance, a conductive agent, a thickening agent and a solvent, and stirring to form a mixture I; 2, carrying out ultrasonic treatment on the mixture I; 3, adding a binder into the mixture I subjected to the ultrasonic treatment, andstirring to form a mixture II; and 4, stirring the mixture II to obtain the negative electrode slurry. The preparation method has the beneficial effects that the negative electrode active substance, the conductive agent, the thickening agent and the solvent are firstly stirred to primarily disperse the material by utilizing shearing force, and then the aggregate is scattered by utilizing ultrasonic waves, so that a better dispersion effect is achieved, and the consistency of the lithium ion battery is ensured.

Description

technical field [0001] The invention relates to the technical field of battery material preparation, in particular to a method for preparing negative electrode slurry. Background technique [0002] In the entire production process of lithium-ion batteries, the pulping process has an impact on product quality of more than 30%, and is the most important link in the entire process. However, most of the current processes still use the high-speed dispersion method to prepare the negative electrode slurry. The slurry prepared by this process is easy to agglomerate and the uniformity of the slurry is not good, so that the consistency of the lithium-ion battery prepared by using this slurry is poor, which affects Battery matching and use. Contents of the invention [0003] The technical problem to be solved by the present invention is to provide a preparation method of negative electrode slurry to overcome the above-mentioned deficiencies in the prior art. [0004] The technical...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01F13/10B01F3/12H01M4/36H01M4/587H01M4/62H01M10/0525
CPCH01M4/364H01M4/587H01M4/625H01M4/62H01M10/0525B01F23/551B01F23/59B01F23/53B01F33/8212Y02E60/10
Inventor 李静陈燕谢佳
Owner 成都格力钛新能源有限公司
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