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A kind of preparation method of natural graphite slurry

A technology of natural graphite and slurry, which is applied in the direction of graphite, conductive materials dispersed in non-conductive inorganic materials, cable/conductor manufacturing, etc., can solve the unstable batch performance of graphite negative electrodes, poor cycle performance of graphite negative electrodes, Problems such as particle morphology and particle size distribution are not uniform, so as to avoid the settlement of large particles and reduce the effect of edges and corners

Active Publication Date: 2020-12-11
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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  • A kind of preparation method of natural graphite slurry

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] 1) The natural graphite material is sequentially passed through a screen with a mesh diameter of 25 microns, 20 microns, 17 microns and 12 microns, and the natural graphite raw materials are separated according to the particle size range, and the natural graphite with a particle size distribution between 20-25 microns Ink is used as the first material, natural graphite with particle size distribution between 17-20 microns is used as the second material, natural graphite with particle size distribution between 12-17 microns is used as the third material, and particle size distribution is between 12 Natural graphite below micron is used as the fourth material;

[0031] 2) The first material is sieved under high pressure, and the sieve size is 28 microns;

[0032] 3) the second material is sieved under high pressure, and the sieve size is 22 microns;

[0033] 4) The third material is sieved under high pressure, and the sieve size is 18 microns;

[0034] 5) The fourth mat...

Embodiment 2

[0041] 1) The natural graphite material is sequentially passed through a screen with a mesh diameter of 25 microns, 20 microns, 17 microns and 12 microns, and the natural graphite raw materials are separated according to the particle size range, and the natural graphite with a particle size distribution between 20-25 microns Ink is used as the first material, natural graphite with particle size distribution between 17-20 microns is used as the second material, natural graphite with particle size distribution between 12-17 microns is used as the third material, and particle size distribution is between 12 Natural graphite below micron is used as the fourth material;

[0042] 2) The first material is sieved under high pressure, and the sieve size is 30 microns;

[0043] 3) the second material is sieved under high pressure, and the sieve size is 24 microns;

[0044] 4) The third material is sieved under high pressure, and the sieve size is 20 microns;

[0045] 5) The fourth mat...

Embodiment 3

[0052] 1) The natural graphite material is sequentially passed through a screen with a mesh diameter of 25 microns, 20 microns, 17 microns and 12 microns, and the natural graphite raw materials are separated according to the particle size range, and the natural graphite with a particle size distribution between 20-25 microns Ink is used as the first material, natural graphite with particle size distribution between 17-20 microns is used as the second material, natural graphite with particle size distribution between 12-17 microns is used as the third material, and particle size distribution is between 12 Natural graphite below micron is used as the fourth material;

[0053] 2) The first material is sieved under high pressure, and the sieve size is 29 microns;

[0054] 3) the second material is sieved under high pressure, and the sieve size is 23 microns;

[0055] 4) The third material is sieved under high pressure, and the sieve size is 19 microns;

[0056] 5) The fourth mat...

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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 preparation method of natural graphite slurry. Background technique [0002] Natural graphite has many advantages, such as low cost, high degree of crystallization, and mature technologies for purification, crushing, and classification. 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...

Claims

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Application Information

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Patent Type & Authority Patents(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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