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Preparation method of negative electrode slurry and negative electrode slurry

A negative electrode slurry and slurry technology, which is applied in the field of electrochemistry and can solve problems such as difficulty in cleaning

Active Publication Date: 2021-04-27
HUBEI JINQUAN NEW MATERIALS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition, in the slurry preparation system of large-scale equipment in the production line, during the automatic feeding process of glue, the glue will form accumulations on the pipe wall after long-term transportation through the pipeline, making cleaning difficult

Method used

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  • Preparation method of negative electrode slurry and negative electrode slurry
  • Preparation method of negative electrode slurry and negative electrode slurry

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0070] This embodiment provides a method for preparing negative electrode slurry, the method comprising the following steps:

[0071] S1: Add the negative electrode active material and conductive agent powder into the mixing equipment in proportion, and stir evenly. The stirring parameters are: revolution 20rpm, dispersion 1000rpm, stirring time 15min;

[0072] S2: Add an appropriate amount of deionized water, stir evenly, the stirring parameters are: revolution 20rpm, dispersion 650rpm, stirring time 35min, to obtain a wet slurry with a solid content of 70%;

[0073] S3: Add thickener powder accounting for 50% of the total mass of CMC powder, stir evenly, the stirring parameters are revolution 15rpm, dispersion 300rpm, stirring time 10min;

[0074] S4: Add thickener powder accounting for 20% of the total mass of CMC powder, and stir evenly. The stirring parameters are 15 rpm for revolution, 150 rpm for dispersion, and 5 min for stirring time;

[0075] S5: Add thickener powde...

Embodiment 2

[0082] S1: Add the negative electrode active material and conductive agent powder into the mixing equipment in proportion, and stir evenly. The stirring parameters are: revolution 30rpm, dispersion 1250rpm, stirring time 8min;

[0083] S2: Add an appropriate amount of deionized water, stir evenly, the stirring parameters are: revolution 25rpm, dispersion 500rpm, stirring time 40min, to obtain a wet slurry with a solid content of 65%;

[0084] S3: Add thickener powder accounting for 55% of the total mass of CMC powder, and stir evenly. The stirring parameters are revolution 25rpm, dispersion 800rpm, and stirring time 5min;

[0085] S4: Add thickener powder accounting for 20% of the total mass of CMC powder, and stir evenly. The stirring parameters are 20 rpm for revolution, 200 rpm for dispersion, and 20 min for stirring time;

[0086] S5: Add thickener powder accounting for 25% of the total mass of CMC powder, and stir evenly. The stirring parameters are revolution 20rpm, disp...

Embodiment 3

[0093] S1: Add the negative electrode active material and conductive agent powder into the mixing equipment in proportion, and stir evenly. The stirring parameters are: revolution 15rpm, dispersion 800rpm, stirring time 30min;

[0094] S2: Add an appropriate amount of deionized water, stir evenly, the stirring parameters are: revolution 20rpm, dispersion 400rpm, stirring time 60min, to obtain a wet slurry with a solid content of 60%;

[0095] S3: Add thickener powder accounting for 50% of the total mass of CMC powder, stir evenly, the stirring parameters are revolution 25rpm, dispersion 600rpm, stirring time 20min;

[0096] S4: Add thickener powder accounting for 30% of the total mass of CMC powder, and stir evenly. The stirring parameters are revolution 15rpm, dispersion 700rpm, and stirring time 10min;

[0097] S5: Add thickener powder accounting for 20% of the total mass of CMC powder, and stir evenly. The stirring parameters are revolution 25rpm, dispersion 450rpm, and sti...

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Abstract

The invention discloses a preparation method of negative electrode slurry and the negative electrode slurry. The method comprises the following steps of (1) mixing a negative electrode active substance, conductive agent powder and water to obtain wetting slurry; (2) adding thickening agent powder in three steps; (3) adding water, and stirring to obtain slurry with preset solid content; and (4) adding an aqueous solution of a binder, and stirring to obtain the negative electrode slurry. According to the method disclosed by the invention, a glue solution preparation procedure is not needed before the negative electrode slurry is prepared, the preparation effect of the slurry can be met, the slurry is proper in viscosity, relatively good in stability, proper in fineness and smooth in filtration, meanwhile, the equipment cost and the occupied area of a slurry preparation system can be reduced, the total slurry preparation time can be greatly shortened, and the labor cost is reduced.

Description

technical field [0001] The invention relates to the field of electrochemical technology, and relates to a preparation method of negative electrode slurry and the negative electrode slurry. Background technique [0002] For lithium-ion batteries, graphite is generally used as the negative electrode active material, and the current preparation process of lithium-ion battery negative electrode slurry is roughly divided into two types: (1) wet mixing process, the basic process is to prepare glue—add conductive agent to mix— Adding active substances and mixing—adding SBR and mixing, this is the mainstream process in China at present. (2) Dry mixing process, the basic process is to prepare the glue for later use—first mix the active material and conductive agent dry powder—add an appropriate amount of glue for wetting—add solvent to disperse and crush—dilute to adjust viscosity—add SBR for mixing. For example CN109638287A discloses a kind of preparation method of negative electro...

Claims

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Application Information

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IPC IPC(8): H01M4/04H01M4/1393H01M4/133
CPCH01M4/04H01M4/1393H01M4/133Y02E60/10
Inventor 伍山松杜双龙卢涛吕正中刘金成
Owner HUBEI JINQUAN NEW MATERIALS CO LTD
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