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Preparation method of microcrystalline graphite negative electrode material easy for pulping

A technology of microcrystalline graphite and negative electrode materials, which is applied in the preparation/purification of carbon, graphite, battery electrodes, etc., and can solve the problems of low cost performance and low yield of products

Active Publication Date: 2020-09-04
HUNAN SHINZOOM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this method does not take into account that the extrusion process will cause deformation and fragmentation of microcrystalline graphite particles, which will undoubtedly lead to lower yields, and therefore, the resulting products are less cost-effective

Method used

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  • Preparation method of microcrystalline graphite negative electrode material easy for pulping

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] A1. Dissolve starch in deionized water, stir evenly to form a high molecular polymer solution, then pour the high molecular polymer solution into a hydrothermal reaction kettle filled with microcrystalline graphite particles, and mix well; among them, starch, deionized The mass ratio of ionized water and microcrystalline graphite particles is 10:500:100. Preferably, the microcrystalline graphite is spherical microcrystalline graphite with a particle size of 12 μm, which is produced in Chenzhou, Hunan.

[0029] A2. Heat the hydrothermal reactor to 160°C at a heating rate of 10°C / min, keep it warm for 12-48 hours, and then cool naturally to obtain water-soluble filled microcrystalline graphite particles.

[0030] A3. Vacuum filter the water-soluble filled microcrystalline graphite particles, and then dry them in an oven at a drying temperature of 120°C to obtain filled microcrystalline graphite particles.

[0031] A4. Then put the filled microcrystalline graphite particl...

Embodiment 2

[0034] A1. Dissolve cyclodextrin in deionized water, stir evenly to form a high molecular polymer solution, then pour the high molecular polymer solution into a hydrothermal reaction kettle filled with microcrystalline graphite particles, and mix well. Wherein, the mass ratio of cyclodextrin, deionized water and microcrystalline graphite particles is 20:500:100. Preferably, the microcrystalline graphite is spherical microcrystalline graphite with a particle size of 12 μm, which is produced in Chenzhou, Hunan.

[0035] A2. Heat the hydrothermal reactor to 120°C at a heating rate of 8°C / min, keep it warm for 24 hours, and then cool naturally to obtain water-soluble filled microcrystalline graphite particles.

[0036] A3. Vacuum filter the water-soluble filled microcrystalline graphite particles, and then dry them in an oven at a drying temperature of 110°C to obtain filled microcrystalline graphite particles.

[0037] A4. Put the filled microcrystalline graphite particles into ...

Embodiment 3

[0040] A1. Dissolve polyvinyl alcohol in deionized water, stir evenly to form a high molecular polymer solution, then pour the high molecular polymer solution into a hydrothermal reaction kettle filled with microcrystalline graphite particles, and mix well. Wherein, the mass ratio of polyvinyl alcohol, deionized water and microcrystalline graphite particles is 15:500:100. Preferably, the microcrystalline graphite is spherical microcrystalline graphite with a particle size of 11 μm, which is produced in Chenzhou, Hunan.

[0041] A2. Then heat the hydrothermal reaction vessel to 180°C at a heating rate of 5°C / min, keep it warm for 12 hours, and cool naturally to obtain water-soluble filled microcrystalline graphite particles.

[0042] A3. Vacuum filter the water-soluble filled microcrystalline graphite particles, and then dry them in an oven at a drying temperature of 130°C to obtain filled microcrystalline graphite particles.

[0043] A4. Put the filled microcrystalline graphi...

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Abstract

The invention discloses a preparation method of a microcrystalline graphite negative electrode material easy for pulping. The method comprises the following steps: dissolving a water-soluble high-molecular polymer in a proper amount of deionized water, uniformly stirring to form a high-molecular polymer solution, pouring the high-molecular polymer solution into a hydrothermal reaction kettle containing microcrystalline graphite particles, and uniformly mixing; and heating the hydrothermal reaction kettle to 120-180 DEG C, keeping the temperature for 12-48 hours, cooling, filtering, drying, carbonizing, screening, and demagnetizing. The method provided by the invention solves the problem of sedimentation in the pulping process of the microcrystalline graphite negative electrode material, and can avoid adhesion of the polymer / microcrystalline graphite compound in the carbonization process.

Description

technical field [0001] The invention relates to the technical field of preparation of lithium-ion battery negative electrode materials, in particular to a microcrystalline graphite negative electrode material that is not easy to settle during the pulping process and a related hydrothermal process. Background technique [0002] my country has abundant microcrystalline graphite mineral resources. However, the technology for deep processing of microcrystalline graphite is relatively poor. At present, it is mainly sold in the form of rough ore, and there is a serious waste of resources. The development of microcrystalline graphite as a negative electrode material for lithium-ion batteries can solve the problem of insufficient deep processing technology. Patents [CN201910492402.0] and [CN201910491666.4] respectively provide fast-charging microcrystalline graphite negative electrode materials and cost-effective microcrystalline graphite negative electrode materials and their prepa...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/587H01M4/62H01M10/0525C01B32/05C01B32/21
CPCH01M4/362H01M4/587H01M4/62H01M10/0525C01B32/21C01B32/05Y02E60/10
Inventor 石磊皮涛邵浩明徐燕宁舒平
Owner HUNAN SHINZOOM TECH
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