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Material mixing method of graphite negative electrode slurry

A graphite negative electrode and graphite material technology, applied to battery electrodes, electrical components, electrochemical generators, etc., can solve problems such as obvious sedimentation, affect coating quality, and uneven dispersion, and achieve simple mixing process and easy operation , good coating performance

Active Publication Date: 2019-06-18
山东中信迪生电源有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The negative electrode of the power battery is generally a graphite negative electrode, and the requirements for the graphite negative electrode are high energy density and good rate performance. The researchers found that by mixing graphite particles with different average particle sizes, the mixed negative electrode can obtain a higher compaction density. Negative electrode, thereby increasing the energy density of the negative electrode, however, due to the presence of graphite particles of various particle sizes in the slurry, it brings greater difficulties in the process of mixing materials, and it is prone to uneven dispersion and obvious sedimentation. thereby affecting the quality of the coating

Method used

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  • Material mixing method of graphite negative electrode slurry

Examples

Experimental program
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Effect test

Embodiment 1

[0023] Provide the first graphite material, the second graphite material, the third graphite material, wherein the average particle diameter d1 of the first graphite material is 1 micron, the average particle diameter d2 of the second graphite material is 3 microns, and the third graphite material The average particle diameter d3 is 6 microns, the percentage content c1 of the first graphite material is 10%, the percentage content c2 of the second graphite material is 60%, and the percentage content c3 of the third graphite material is 30%;

[0024] 1), adding water into the first stirred tank, adding SBR, stirring for 4h; adding the three graphite materials into the first stirred tank according to the mass ratio, stirring for 6h, and then adding the first graphite material according to the mass ratio Added into the first stirred tank, stirred for 6h to obtain the first slurry;

[0025] 2), adding water into the second stirred tank, adding SBR, and stirring for 4h; according to...

Embodiment 2

[0028] A first graphite material, a second graphite material, and a third graphite material are provided, wherein the average particle diameter d1 of the first graphite material is 0.5 microns, the average particle diameter d2 of the second graphite material is 1.7 microns, and the third graphite material The average particle diameter d3 is 6.5 microns, the percentage content c1 of the first graphite material is 5%, the percentage content c2 of the second graphite material is 75%, and the percentage content c3 of the third graphite material is 20%;

[0029] 1), adding water into the first stirred tank, adding SBR, stirring for 4h; adding the three graphite materials into the first stirred tank according to the mass ratio, stirring for 6h, and then adding the first graphite material according to the mass ratio Added into the first stirred tank, stirred for 6h to obtain the first slurry;

[0030] 2), adding water into the second stirred tank, adding SBR, stirring for 4h; accordi...

Embodiment 3

[0033] Provide the first graphite material, the second graphite material, the third graphite material, wherein the average particle diameter d1 of the first graphite material is 1 micron, the average particle diameter d2 of the second graphite material is 2.1 microns, and the third graphite material The average particle diameter d3 is 6 microns, the percentage content c1 of the first graphite material is 10%, the percentage content c2 of the second graphite material is 70%, and the percentage content c3 of the third graphite material is 20%;

[0034] 1), adding water into the first stirred tank, adding SBR, stirring for 4h; adding the three graphite materials into the first stirred tank according to the mass ratio, stirring for 6h, and then adding the first graphite material according to the mass ratio Added into the first stirred tank, stirred for 6h to obtain the first slurry;

[0035] 2), adding water into the second stirred tank, adding SBR, stirring for 4h; according to t...

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Abstract

The invention provides a material mixing method of graphite negative electrode slurry. The graphite negative electrode slurry comprises a first graphite material, a second graphite material and a third graphite material, wherein the average grain diameter of the first graphite material is d1, the average grain diameter of the second graphite material is d2, and the average grain diameter of the third graphite material is d3, wherein d1 is smaller than d2 which is smaller than d3, and d2 is equal to k*(d1+d3); k is equal to a*(c1+c3) / (c2+0.5), wherein a is an equilibrium constant, and a is greater than or equal to 1.1 and less than or equal to 1.3; c1, c2 and c3 represent percentages of the first graphite material, the second graphite material and the third graphite material; and c1+ c2 +c3is equal to 1, and c1+c2 is less than or equal to c3. The material mixing method comprises the following steps of carrying out mixing on the first graphite material, the second graphite material andthe third graphite material to obtain three slurry materials respectively, and then enabling the three slurry materials to be mixed according to a specific sequence to obtain the graphite negative electrode slurry with high dispersion degree. The graphite negative electrode slurry disclosed by the invention is high in graphite dispersion degree, free of agglomeration, free of sedimentation, high in storage stability, high in energy density and high in rate performance.

Description

technical field [0001] The invention relates to the technical field of lithium ion battery production, in particular to a method for mixing graphite negative electrode slurry. Background technique [0002] Power batteries have the advantages of high energy density, high power, and environmental protection, and are often used in the field of electric vehicles. The negative electrode of the power battery is generally a graphite negative electrode, and the requirements for the graphite negative electrode are high energy density and good rate performance. The researchers found that by mixing graphite particles with different average particle sizes, the mixed negative electrode can obtain a higher compaction density. Negative electrode, thereby increasing the energy density of the negative electrode, however, due to the presence of graphite particles of various particle sizes in the slurry, it brings greater difficulties in the process of mixing materials, and it is prone to unev...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/583H01M4/62H01M10/0525
CPCY02E60/10
Inventor 李壮
Owner 山东中信迪生电源有限公司
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