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Preparation method of negative electrode slurry without glue solution, obtained negative electrode slurry and application

A kind of negative electrode slurry, no glue technology, applied in the direction of negative electrode, battery electrode, active material electrode, etc., can solve the problem of high viscosity of glue solution, long-term dispersion, etc., achieve good stability of slurry, reduce equipment cost, The effect of reducing labor costs

Inactive Publication Date: 2020-09-29
HUBEI JINQUAN NEW MATERIALS CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] In view of the existing technology, the glue solution needs to be prepared in advance before the slurry is prepared. Due to the high viscosity of the glue solution, it takes a long time to disperse

Method used

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  • Preparation method of negative electrode slurry without glue solution, obtained negative electrode slurry and application
  • Preparation method of negative electrode slurry without glue solution, obtained negative electrode slurry and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0054] A kind of preparation method without the negative electrode slurry of glue comprises the following steps:

[0055] (1) 97.5wt% negative electrode active material (graphite of D50=15 μm), 1wt% conductive agent powder (diameter is the SP of 180nm) and the thickener CMC powder of 1.5wt% (particle diameter is D50=75 μm) mixing, Carry out the first stirring and mixing for 20 minutes with a revolution rate of 20 rpm and an autorotation of 200 rpm to obtain a mixed powder;

[0056] (2) Mix the mixed powder with water, and carry out the second stirring and mixing at a speed of 20 rpm and 2000 rpm for 250 min to obtain a slurry with a solid content of 65 wt %;

[0057] (3) mixing the slurry obtained in step (2) with water to obtain a slurry with a solid content of 54wt% and a viscosity of 4461mPa·s;

[0058] (4) Mix the slurry obtained in step (3) with a binder (SBR), the mass ratio of the binder to the thickener CMC powder is 3:1, and the speed is 10rpm in revolution and 600rp...

Embodiment 2

[0060] The difference from Example 1 is that the solid content of the negative electrode slurry in step (3) is adjusted to 40wt%.

Embodiment 3

[0062] A kind of preparation method without the negative electrode slurry of glue comprises the following steps:

[0063] (1) 97wt% negative electrode active material (graphite of D50=10 μm), 1.5wt% conductive agent powder (diameter is the SP of 150nm) and thickener CMC powder (particle diameter is D50=70 μm) of 1.5wt% are mixed, Carry out the first stirring and mixing for 40 minutes with a revolution rate of 5 rpm and an autorotation of 500 rpm to obtain a mixed powder;

[0064] (2) Mix the mixed powder with water, carry out the second stirring and mixing at a speed of 5 rpm and 2500 rpm for 270 min to obtain a slurry with a solid content of 65 wt %;

[0065] (3) mixing the slurry obtained in step (2) with water to obtain a slurry with a solid content of 55wt% and a viscosity of 4600mPa·s;

[0066] (4) Mix the slurry obtained in step (3) with a binder (SBR), the mass ratio of the binder to the thickener CMC powder is 4:1, and the speed is 5rpm in revolution and 1000rpm in ro...

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Abstract

The invention discloses a preparation method of negative electrode slurry without a glue solution, the obtained negative electrode slurry and application. The method comprises the following steps of (1) mixing a negative electrode active substance, conductive agent powder and thickening agent CMC powder to obtain mixed powder; (2) mixing the mixed powder with the water to obtain slurry with the solid content of 60-70wt%; (3) mixing the slurry obtained in the step (2) with the water to obtain slurry of which the solid content is less than or equal to 55wt%; and (4) mixing the slurry obtained inthe step (3) with a binder to obtain the negative electrode slurry. The method is advantaged in that a glue solution preparation procedure is not needed before slurry preparation, the slurry preparation effect can be achieved, meanwhile, equipment cost and the occupied area of a slurry preparation system can be reduced, the total slurry preparation time can be greatly shortened, and labor cost isreduced, in addition, the negative electrode slurry prepared by the negative electrode slurry preparation method provided by the invention is relatively good in dispersion uniformity and slurry stability.

Description

technical field [0001] The invention belongs to the technical field of batteries, and in particular relates to a preparation method of a negative electrode slurry without glue, the obtained negative electrode slurry and uses. Background technique [0002] Lithium-ion batteries have attracted extensive attention in the field of renewable energy storage technologies due to their high energy density and environmental friendliness. For lithium-ion batteries with lithium iron phosphate as the positive electrode active material, 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 Prepare glue - add conductive agent and mix - add active material and mix - add SBR and mix. This is the mainstream process in China at present; (2) dry mixing process, the basic process is to prepare the glue for standby - ...

Claims

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Application Information

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IPC IPC(8): H01M4/62H01M4/587H01M4/133H01M4/1393H01M10/0525
CPCH01M4/133H01M4/1393H01M4/587H01M4/62H01M4/625H01M10/0525H01M2004/027Y02E60/10
Inventor 伍山松杜双龙赵仕绪吕正中刘金成
Owner HUBEI JINQUAN NEW MATERIALS CO LTD
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