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Battery slurry stirring method

A stirring method and slurry technology, which is applied in the direction of battery electrodes, circuits, electrical components, etc., can solve the problems of inability to effectively improve the stripping force of the pole piece, affect the conductivity of the slurry, and low stripping force of the pole piece

Active Publication Date: 2021-04-23
EVE ENERGY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, both of the above two processes have some insurmountable disadvantages
The disadvantage of the dry mixing process is that the agglomeration of the conductive agent will occur in the powder mixing stage of the first step, especially when the proportion of the conductive agent is high, this phenomenon will be more obvious, and once the agglomeration occurs in the subsequent mixing step, it cannot spread out
The disadvantage of the wet mixing process is that the peeling force of the pole piece is low. The higher the content of the conductive agent and the higher the oil absorption value, the lower the peeling force of the produced pole piece will be; however, if the content of the conductive agent is reduced, it will affect the slurry. The electrical conductivity of the material, and it cannot effectively improve the peeling force of the pole piece

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035]S111, mixing 20kg of polyvinylidene fluoride rubber powder and 500kg of N-methylpyrrolidone according to the stirring parameters whose revolution speed is 5rpm and whose dispersion speed is 500rpm, stir and mix evenly to obtain a glue solution;

[0036] S112, at normal temperature, 70kg of the glue and 500kg of N-methylpyrrolidone are stirred and mixed evenly according to the stirring parameters that the revolution speed is 5rpm and the dispersion speed is 500rpm, so as to obtain the diluted glue;

[0037] S113, adding 50kg of carbon nanotubes and 10kg of n-butanol to the diluted glue solution, according to the stirring parameters that the revolution speed is 5rpm, and the dispersion speed is 500rpm, stir and mix evenly to obtain a conductive glue;

[0038] S114, adding 400kg of NCM523 and 10kg of citric acid to the conductive adhesive, according to the stirring parameters whose revolution speed is 5rpm, and the dispersion speed is 500rpm, stir and mix evenly to obtain a ...

Embodiment 2

[0042] S111, 30kg of polyvinylidene fluoride rubber powder and 600kg of N-methylpyrrolidone, according to the revolution speed of 17.5rpm, the dispersion speed of 1750rpm stirring parameters, stir and mix evenly to obtain glue;

[0043] S112, at normal temperature, 60kg of the glue and 550kg of N-methylpyrrolidone are stirred and mixed evenly according to the stirring parameters that the revolution speed is 17.5rpm and the dispersion speed is 1750rpm, so as to obtain the diluted glue;

[0044] S113, add 5kg of superconducting carbon black, 25kg of carbon nanotubes and 15kg of isopropanol to the diluted glue solution, and stir and mix evenly according to the stirring parameters that the revolution speed is 17.5rpm and the dispersion speed is 1750rpm to obtain a conductive glue;

[0045] S114, adding 500kg of NCM622 and 15kg of oxalic acid to the conductive adhesive, according to the stirring parameters whose revolution speed is 17.5rpm, and the dispersion speed is 1750rpm, stir...

Embodiment 3

[0049] S111, with 40kg of carboxymethylcellulose sodium rubber powder and 700kg of deionized water, according to the revolution speed is 30rpm, the dispersion speed is 3000rpm stirring parameters, stir and mix evenly to obtain glue;

[0050] S112, at normal temperature, 50kg of the glue and 600kg of deionized water are stirred and mixed evenly according to the stirring parameters that the revolution speed is 30rpm and the dispersion speed is 3000rpm, so as to obtain the diluted glue;

[0051] S113, adding 8kg of superconducting carbon black, 2kg of acetylene black and 20kg of isobutanol to the diluted glue, according to the revolution speed of 30rpm, the stirring parameters of the dispersion speed of 3000rpm, stirring and mixing evenly to obtain a conductive glue;

[0052] S114, adding 400kg of graphite, 200kg of mesocarbon microspheres and 20kg of formic acid to the conductive adhesive, according to the stirring parameters of the revolution speed of 30rpm and the dispersion sp...

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Abstract

The invention relates to the technical field of batteries, and discloses a battery slurry stirring method, which comprises the steps of: uniformly stirring and mixing a glue solution and a solvent to obtain a diluted glue solution; adding a conductive agent and an additive A into the diluted glue solution, and uniformly stirring and mixing to obtain a conductive adhesive; adding a main material and an additive B into the conductive adhesive, and uniformly stirring and mixing to obtain premixed slurry; and adding a main material, a glue solution and a solvent into the premixed slurry, and uniformly stirring and mixing to obtain the battery slurry. According to the method, the dispersity of the conductive agent can be improved, the stability of slurry is improved, the stripping force of the electrode plate can be improved, and the powder falling phenomenon of the electrode plate is reduced.

Description

technical field [0001] The invention relates to the technical field of batteries, in particular to a method for stirring battery slurry. Background technique [0002] Currently, battery slurry mixing methods mainly include dry mixing process and wet mixing process. Among them, the common practice of the dry mixing process is to dry mix the main material and the conductive agent, then add the solvent and the glue to knead, and finally add the glue to make a slurry. The common practice of the wet mixing process is to first mix the conductive agent and glue solution to prepare the conductive adhesive, and then add the main material and solvent to make slurry. [0003] However, the above two processes have some insurmountable disadvantages. The disadvantage of the dry mixing process is that the agglomeration of the conductive agent will occur in the first step of powder mixing, especially when the proportion of the conductive agent is high, and this phenomenon will be more obv...

Claims

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Application Information

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IPC IPC(8): H01M4/04
CPCH01M4/0409Y02E60/10
Inventor 胡省辉卜芳刘金谢杨吴小娟罗垂意刘建华刘金成
Owner EVE ENERGY CO LTD