Preparation method of natural graphite slurry

A technology of natural graphite and slurry, applied in the direction of graphite, conductive materials dispersed in non-conductive inorganic materials, cable/conductor manufacturing, etc. The problem of low compaction density, etc., can avoid the settlement of large particles and reduce the edges and corners.

Active Publication Date: 2020-01-17
泰州纳新新能源科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the disadvantages of natural graphite are also obvious. The particle shape and particle size distribution of the lamellar structure of natural graphite are uneven, and the single particle has many corners, which leads to low compaction density, and the tip of the graphite particle is easy to react with the electrolyte. , the branched carbon of the organic solvent in the electrolyte is easily inserted into the graphite layer from the tip, resulting in poor cycle performance of the graphite negative electrode; and the particle size distribution of natural graphite is uneven, resulting in unstable performance between batches of graphite negative electrodes

Method used

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  • Preparation method of natural graphite slurry

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] 1) Pass the natural graphite material through screens with mesh diameters of 25 microns, 20 microns, 17 microns and 12 microns in order to separate the natural graphite raw materials according to the particle size range, and the natural stone with a particle size distribution between 20-25 microns Ink is used as the first material, natural graphite with a particle size distribution between 17-20 microns is used as the second material, and natural graphite with a particle size distribution between 12-17 microns is used as the third material, and the particle size is distributed at 12 Natural graphite below micron is used as the fourth material;

[0031] 2) Pass the first material through a high-pressure sieve, the sieve size is 28 microns;

[0032] 3) Pass the second material through a high-pressure sieve, the sieve size is 22 microns;

[0033] 4) Pass the third material through a high-pressure sieve, the sieve size is 18 microns;

[0034] 5) Pass the fourth material through a ...

Embodiment 2

[0041] 1) Pass the natural graphite material through screens with mesh diameters of 25 microns, 20 microns, 17 microns and 12 microns in order to separate the natural graphite raw materials according to the particle size range, and the natural stone with a particle size distribution between 20-25 microns Ink is used as the first material, natural graphite with a particle size distribution between 17-20 microns is used as the second material, and natural graphite with a particle size distribution between 12-17 microns is used as the third material, and the particle size is distributed at 12 Natural graphite below micron is used as the fourth material;

[0042] 2) Pass the first material through a high-pressure sieve, the sieve size is 30 microns;

[0043] 3) Pass the second material through a high-pressure sieve, the sieve size is 24 microns;

[0044] 4) Pass the third material through a high-pressure sieve, the sieve size is 20 microns;

[0045] 5) Pass the fourth material through a ...

Embodiment 3

[0052] 1) Pass the natural graphite material through screens with mesh diameters of 25 microns, 20 microns, 17 microns and 12 microns in order to separate the natural graphite raw materials according to the particle size range, and the natural stone with a particle size distribution between 20-25 microns Ink is used as the first material, natural graphite with a particle size distribution between 17-20 microns is used as the second material, and natural graphite with a particle size distribution between 12-17 microns is used as the third material, and the particle size is distributed at 12 Natural graphite below micron is used as the fourth material;

[0053] 2) Pass the first material through a high-pressure sieve, the sieve size is 29 microns;

[0054] 3) Pass the second material through a high-pressure sieve, the sieve size is 23 microns;

[0055] 4) Pass the third material through a high-pressure sieve, the sieve size is 19 microns;

[0056] 5) Pass the fourth material through a ...

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Abstract

The invention provides a preparation method of natural graphite slurry. The preparation method comprises the following steps of separating the natural graphite powder according to a particle size range; carrying out different treatment processes according to different particle size ranges, and pulping and mixing the treated natural graphite according to different modes, so that the dispersity of the natural graphite slurry, the stability of the slurry and the performance of an electrode obtained by coating can be improved.

Description

Technical field [0001] The invention relates to the technical field of lithium ion battery production, in particular to a method for preparing natural graphite slurry. Background technique [0002] Natural graphite has many advantages, its low cost, high degree of crystallinity, and mature purification, crushing and classification technology. However, the shortcomings of natural graphite are also obvious. The particle morphology and particle size distribution of natural graphite with lamellar structure are not uniform, and the single particle has many edges and corners, which results in low compaction density and the graphite particle tip is easy to react with the electrolyte. , The branched carbon of the organic solvent in the electrolyte is easily inserted into the graphite layer from the tip, which leads to the deterioration of the cycle performance of the graphite anode; and the particle size distribution of natural graphite is uneven, resulting in unstable performance betwee...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/583H01M10/0525H01B1/24H01B13/00C01B32/21
CPCC01B32/21H01B1/24H01B13/00H01M4/583H01M10/0525Y02E60/10
Inventor 陆晨杰
Owner 泰州纳新新能源科技有限公司
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