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A kind of lithium battery positive electrode slurry and its processing technology

A positive electrode slurry and lithium-ion battery technology, which is applied in the direction of battery electrodes, circuits, electrical components, etc., can solve the problems of difficult drying of positive electrode slurry, high viscosity of positive electrode slurry, unfavorable processing costs, etc., to reduce the overall usage, Reduce the fineness and improve the mixing effect

Active Publication Date: 2020-09-01
醒狮科技投资有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Among them, the quality of the positive electrode slurry directly affects the performance of the battery. The main index affecting the quality of the positive electrode slurry is the dispersibility of the positive electrode slurry. The more uniform the positive electrode slurry is dispersed, the conductive agent and binder in the positive electrode slurry can When the maximum effect is obtained, the impedance of the positive electrode can be evenly distributed, and the performance of the lithium battery can be improved. Because the thickness of the positive electrode slurry is relatively large when it is coated on the positive electrode current collector, the viscosity of the positive electrode slurry in the prior art Large, poor rheology, which is not conducive to the control of processing costs. If the solid content is reduced in order to reduce the viscosity, it will cause difficulty in drying the positive electrode slurry and uneven coating. In order to provide a positive electrode slurry with good dispersion performance and high solid content , the present invention provides the following technical solutions

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] A positive electrode slurry for a lithium ion battery, the raw material composition of the positive electrode slurry and the mass percentage of each raw material are: positive electrode active material 47%-52%, solvent 46%-50%, binder 0.7%-1.5%, conductive Agent 0.6%-1.2% and dispersant 1.5%-2%;

[0034] The positive active material is lithium cobaltate;

[0035] Described solvent is the mixture of N-methylpyrrolidone and deionized water, wherein N-methylpyrrolidone accounts for 95% of solvent volume, and deionized water accounts for 5% of solvent volume, and the volatility of described N-methylpyrrolidone is relatively Small, high thermal stability, when drying the positive electrode of lithium battery in production, the drying speed of the slurry will be relatively slow, but because N-methylpyrrolidone can evaporate with water vapor, it is mixed in N-methylpyrrolidone A certain amount of deionized water can accelerate the drying of the slurry after coating, thereby i...

Embodiment 2

[0051] A positive electrode slurry for a lithium ion battery, the raw material composition of the positive electrode slurry and the mass percentage of each raw material are: positive electrode active material 47%-52%, solvent 46%-50%, binder 0.7%-1.5%, conductive Agent 0.6%-1.2% and dispersant 1.5%-2%;

[0052] The positive electrode active material is lithium nickel cobalt manganese oxide;

[0053] The solvent is a mixture of N-methylpyrrolidone and deionized water, wherein N-methylpyrrolidone accounts for 90% of the solvent volume, and deionized water accounts for 10% of the solvent volume;

[0054] The binding agent is polytetrafluoroethylene;

[0055] The dispersant is polyvinylpyrrolidone;

[0056] The conductive agent is a mixture of acetylene black and a conductive enhancer, and the conductive enhancer is graphene.

[0057] The preparation method of described conductive agent is:

[0058] Add the conductivity enhancer to the stirring container, use a mixer to stir t...

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Abstract

The invention discloses a positive electrode slurry for lithium ion battery and a processing technology thereof. The raw material composition of the positive electrode slurry and the percentages of each raw material are as follows: 47%-52% of positive electrode active material, solvent 46%-50%, bind 0.7%-1.5%, conductive agent 0.6%-1.2% and dispersant 1.5%-2%; The processing technology of the invention dissolves the dispersant into a solvent, the conductive agent is added into the solvent to improve the dispersion effect of the conductive agent in the solvent, which prevents the conductive agent from flocculating and precipitating in the slurry and causing the viscosity of the slurry to change greatly before and after stirring, At that same time, the solution of dispersant and binder is divided into two parts with different viscosity, A part of low viscosity glue is mixed with positive active material, and then a part of glue with higher viscosity is added into the primary slurry gradually, which can reduce the total usage of glue, increase the solid content of positive slurry, reduce the fineness of slurry, and improve the stability of viscosity and dispersibility of slurry.

Description

technical field [0001] The invention belongs to the technical field of lithium ion battery manufacturing, and in particular relates to a lithium battery positive electrode slurry and a processing technology thereof. Background technique [0002] Lithium battery has quickly occupied the battery market since its inception, and its advantages such as long service life, high voltage, and high energy density also have a wider range of use. Lithium-ion batteries are used to supply energy in many electronic products in the prior art. The ion battery mainly includes a positive electrode sheet, a negative electrode sheet, and a separator arranged between the positive electrode sheet and the negative electrode sheet. The positive electrode sheet includes a positive electrode collector and a positive electrode film coated on the positive electrode collector. The negative electrode diaphragm covered on the negative electrode current collector and the positive electrode diaphragm are for...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/62
CPCH01M4/62H01M4/623H01M4/625Y02E60/10
Inventor 钟旭航其他发明人请求不公开姓名
Owner 醒狮科技投资有限公司