Negative electrode paste performance improvement method

A negative electrode slurry and performance technology, applied to battery electrodes, electrical components, circuits, etc., can solve problems such as uneven coating on the front and back of copper foil, affecting coating operations, and easy agglomeration of negative electrode slurry

Pending Publication Date: 2018-07-13
宁夏科捷锂电池股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] At present, the water-based negative electrode slurry uses CMC as the thickener, SBR as the binder, and deionized water as the solvent for slurrying. During the coating process, there are problems such as uneven coating on the front and back of the copper foil, and easy caking of the negative electrode slurry. The main reason for these problems is that the negative electrode graphite particles are i

Method used

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  • Negative electrode paste performance improvement method

Examples

Experimental program
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Effect test

Embodiment 1

[0021] The method for improving the performance of the negative electrode slurry of the present embodiment comprises the following steps:

[0022] A. Pulping:

[0023] a. Add deionized water (deionized water accounts for 70% of the total weight of the slurry) and CMC into the mixing tank, and when the CMC is completely dissolved in the deionized water, start stirring, with rotation at 25Hz, revolution at 40Hz, and stirring for 50min;

[0024] b. Add conductive carbon black to the slurry stirred in step a, start stirring, rotate at 25Hz, revolution at 40Hz, vacuumize to -0.09Mpa, and stir for 80min;

[0025] c. Add negative electrode graphite, DBSA (add 1% relative to graphite) and remaining solvent (30%) to the slurry stirred in step b, vacuumize to -0.09Mpa, start stirring, and rotate at 25Hz, revolution 40Hz, stirring for 140min;

[0026] d. Add the weighed SBR to the slurry stirred in step d, vacuumize to -0.09Mpa, rotate at 25Hz, revolution at 40Hz, and stir for 80min; ...

Embodiment 2

[0034] The performance improvement method of negative electrode slurry of the present invention comprises the following steps:

[0035] A. Pulping:

[0036] a. Add deionized water (deionized water accounts for 85% of the total weight of the slurry) and CMC into the mixing tank, and when the CMC is completely dissolved in the deionized water, start stirring, with rotation at 30Hz, revolution at 45Hz, and stirring for 70min;

[0037] b. Add conductive carbon black to the slurry stirred in step a, start stirring, rotate at 30Hz, revolution at 45Hz, vacuumize to -0.095Mpa, and stir for 100min;

[0038] c. Add negative electrode graphite, DBSA (add 2% relative to graphite) and remaining solvent (15%) to the slurry stirred in step b, vacuumize to 0.095Mpa, start stirring, and rotate at 30Hz and revolution at 45Hz , stirring for 160min;

[0039] d. Add the weighed SBR to the slurry stirred in step d, vacuumize to -0.095Mpa, rotate at 30Hz, revolution at 50Hz, and stir for 100min; ...

Embodiment 3

[0047] The performance improvement method of negative electrode slurry of the present invention comprises the following steps:

[0048] A. Pulping:

[0049] a. Add deionized water (deionized water accounts for 80% of the total weight of the slurry) and CMC into the mixing tank, and when the CMC is completely dissolved in the deionized water, start stirring, with rotation at 25Hz, revolution at 45Hz, and stirring for 60min;

[0050] b. Add conductive carbon black to the slurry stirred in step a, start stirring, rotate at 30Hz, revolve at 40Hz, vacuumize to -0.095Mpa, and stir for 90min;

[0051] c. Add negative electrode graphite, DBSA (add 2% relative to graphite) and 20% of the remaining solvent (add solvent twice) to the slurry stirred in step b, vacuumize to -0.09Mpa, start stirring, and Rotation 25Hz, revolution 45Hz, stirring 150min;

[0052] d. Add the weighed SBR to the slurry stirred in step d, vacuumize to -0.095Mpa, rotate at 30Hz, revolution at 50Hz, and stir for ...

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Abstract

The invention discloses a negative electrode paste performance improvement method. The method comprises the following steps of A, paste preparation: a, adding deionized water and CMC to a stirring bucket; b, adding conductive carbon black to the paste after the paste is stirred in the step a; c, adding negative electrode graphite, DBSA and the residual solvent; d, adding weighed SBR; e, performingscreening on the stirred paste; B, coating: a, setting stationary knife table parameters, and starting a heating switch to set a warm area temperature; b, putting negative electrode paste into a material groove; c, starting a coater and performing debugging; and d, after debugging is qualified, starting a host to perform coating as normal. By adoption of the method, a modifying agent dodecylbenzene sulfonic acid is skillfully added in the paste preparation process; and on the basis, the adding working procedures of each added component are controlled reasonably in the preparation process, andstirring parameters are limited reasonably after each component is added so as to improve negative electrode particle dispersity, thereby realizing graphite powder particle uniform distribution and improving the paste performance.

Description

technical field [0001] The invention relates to a method for preparing negative electrode slurry, in particular to a method for improving the performance of negative electrode slurry. Background technique [0002] At present, the water-based negative electrode slurry uses CMC as the thickener, SBR as the binder, and deionized water as the solvent for slurrying. During the coating process, there are problems such as uneven coating on the front and back of the copper foil, and easy caking of the negative electrode slurry. The main reason for these problems is that the negative electrode graphite particles are insoluble in water. By adding CMC, SBR, etc., the negative electrode graphite particles form a suspension to achieve uniform slurry. However, the negative electrode particles are easy to agglomerate, which affects the subsequent Coating operation, the experimental data shows that the difference in density between the front and back of the copper foil during the negative e...

Claims

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Application Information

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IPC IPC(8): H01M4/139H01M4/62
CPCH01M4/139H01M4/62Y02E60/10
Inventor 张校菠
Owner 宁夏科捷锂电池股份有限公司
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