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A lithium battery negative electrode batching process

A batching process and lithium battery technology, applied in the field of lithium ion batching, can solve the problems of low initial viscosity of high-speed dispersion, insufficient anti-settling ability of slurry, poor stability of slurry, etc. Discharge performance, effect of increasing kneading viscosity or friction

Active Publication Date: 2021-10-15
湖南鹏博新材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] 1. Insufficient anti-settling ability of slurry;
[0007] 2. The slurry has poor stability and low solid content;
[0008] 3. The initial viscosity of high-speed dispersion is low, the speed is not high, and the dispersion force is low;
[0009] 4. Long batching cycle

Method used

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  • A lithium battery negative electrode batching process
  • A lithium battery negative electrode batching process
  • A lithium battery negative electrode batching process

Examples

Experimental program
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Effect test

Embodiment 1

[0037] See ingredients figure 1 , first configure two kinds of CMC glue with different solid content, negative electrode graphite and conductive agent are pre-mixed for 30 minutes, then add high-solid CMC glue (solid content 1.7%), so that the solid content of the slurry at this step is 65%-70 % for kneading (the proportion of CMC in this step is 0.84% ​​of the total dry powder), then add low-solid content glue (solid content 1.5%) for high-speed dispersion (16m / s), and then add SBR for medium-speed dispersion (11m / s), The solid content of the slurry is 52%, the viscosity fluctuates at ±250mpa.s, and the solid content fluctuates at ±0.5%.

Embodiment 2

[0039] See ingredients figure 1 , first configure two kinds of CMC glue with different solid content, negative electrode graphite and conductive agent are pre-mixed for 35 minutes, and then add CMC glue with high solid content (solid content 2%), so that the solid content of the slurry at this step is 65%-70 % for kneading (the proportion of CMC in this step is 0.94% of the total dry powder), then add the remaining low-solid content glue (solid content 1.0%) for high-speed dispersion (18m / s), and then add SBR for medium-speed dispersion (10m / s) , The solid content of the slurry is 53%, the viscosity fluctuates at ±350mpa.s, and the solid content fluctuates at ±0.5%.

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Abstract

The invention provides a lithium battery negative electrode batching process, which includes the following steps: add water to CMC to configure two kinds of CMC glue solutions with different solid contents, dry powder pre-mixing of negative electrode graphite and conductive agent for 30-50 minutes, and then add high Knead in CMC glue with solid content, control the solid content between 64%-70%; then add low-solid content CMC glue for high-speed dispersion, control the speed between 14-18m / s; then add bonding agent, carry out medium-speed dispersion, and control the speed between 11-13m / s; finally vacuumize and stand still to obtain negative electrode slurry. In the present invention, the raw material dry powder is prepared into the same fluid (non-Newtonian fluid) through pretreatment, and the characteristics of easier mixing and dispersion between the same fluids are used to achieve the best dispersion effect of the slurry, reduce the amount of residue, and reduce the cost; reduce the fineness of the slurry, Shorten the sieving time, improve efficiency, and improve cycle and self-discharge performance.

Description

technical field [0001] The invention relates to the technical field of lithium ion batching, in particular to a lithium battery negative electrode batching process. Background technique [0002] In the prior art, the production of lithium-ion batteries usually involves coating the prepared positive electrode slurry and negative electrode slurry on the surface of the positive electrode current collector and the negative electrode current collector to form positive electrode sheets and negative electrode sheets. The preparation of slurry includes a series of processes such as mixing, dissolving, and dispersing between liquid and liquid, liquid and solid materials, and in this process, it is accompanied by changes in temperature, viscosity, and environmental conditions. Therefore, the quality of slurry dispersion directly affects the quality of subsequent lithium-ion battery production and the performance of the final product. [0003] At present, the negative electrode slurry...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/04H01M4/62H01M10/0525
CPCH01M4/04H01M4/62H01M10/0525Y02E60/10
Inventor 洪天立傅昭
Owner 湖南鹏博新材料有限公司
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