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High-capacity, high-compaction and quick-charge composite graphite negative electrode material and preparation method thereof

A technology of composite graphite and negative electrode materials, applied in graphite, negative electrodes, battery electrodes, etc., can solve the problem that graphite negative electrode materials cannot take into account high capacity, high compaction and fast charging performance, and achieve excellent fast charging performance and accelerated migration rate , The effect of simple preparation process

Inactive Publication Date: 2020-09-11
WANXIANG 123 CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The technical problem to be solved by the present invention is that in order to overcome the defect that the graphite anode material developed in the prior art cannot take into account the high capacity, high compaction and fast charging performance, a secondary particle structure of composite graphite is constructed, and the advantages of natural graphite are used to ensure The high capacity and high compaction performance of the material of the present invention are achieved, and the expansion of natural graphite is buffered by the partial isotropy of artificial graphite

Method used

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  • High-capacity, high-compaction and quick-charge composite graphite negative electrode material and preparation method thereof
  • High-capacity, high-compaction and quick-charge composite graphite negative electrode material and preparation method thereof
  • High-capacity, high-compaction and quick-charge composite graphite negative electrode material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] ① 22.8Kg of flake graphite, 37.2Kg of artificial graphite prepared from needle-shaped coke raw powder with a degree of graphitization ≥ 94%, and 10.8Kg of high-temperature petroleum pitch were mixed in a V-type mixer at 25r / min for 60min to obtain a mixture, of which natural stone The particle size D50 of ink is 6-12 μm, the particle size D50 of artificial graphite is 8-16 μm, and the particle size D50 of amorphous carbon is 3-5 μm;

[0038] ②Put the mixture into the vertical reactor, the stirring speed is 25r / min, at room temperature (25°C) the temperature is raised at a rate of 2°C / min, the heating time is 150min, and the temperature is kept constant for 120min to obtain secondary particles of composite graphite;

[0039] ③Carbonize the above-mentioned secondary particles under the protection of nitrogen at a temperature of 1150°C for 15 hours, and cool down to room temperature;

[0040] The above-mentioned carbonized product was mixed with a V-type mixer at 25r / min f...

Embodiment example 2

[0042] ① 25.2Kg of spherical graphite, 34.8Kg of artificial graphite prepared from petroleum coke raw powder with a degree of graphitization ≥ 94%, and 11.4Kg of epoxy resin were mixed in a V-type mixer at 35r / min for 60min to obtain a mixture, of which natural graphite The particle size D50 is 6-16 μm, the particle size D50 of artificial graphite is 10-15 μm, and the particle size D50 of amorphous carbon is 2-5 μm;

[0043] ②Put the mixture into the vertical reactor, the stirring speed is 40r / min, at room temperature (25°C) the temperature is raised at a rate of 1°C / min, the heating time is 300min, and the temperature is kept constant for 300min to obtain the secondary particles of composite graphite;

[0044] ③Carbonize the above-mentioned secondary particles under the protection of nitrogen at a temperature of 800°C for 15 hours, and cool down to room temperature;

[0045] ④ Mix the above carbonized product with a V-type mixer at 25r / min for 60min and pass through a 250-mes...

Embodiment example 3

[0047] ① 31.8Kg of microcrystalline graphite, 28.2Kg of artificial graphite prepared by natural pitch coke with a degree of graphitization ≥ 94%, and 9.6Kg of high-temperature petroleum pitch were mixed in a V-type mixer at 30r / min for 60min to obtain a mixture, of which natural graphite The particle size D50 is 10-16 μm, the particle size D50 of artificial graphite is 10-16 μm, and the particle size D50 of amorphous carbon is 5-8 μm;

[0048] ②Put the mixture into a vertical reactor with a stirring speed of 35r / min, and heat up at room temperature (25°C) at a rate of 5°C / min for 30min, then keep the temperature for 200min to obtain secondary particles of composite graphite;

[0049] ③Carbonize the above-mentioned secondary particles under the protection of nitrogen at a temperature of 1500°C for 15 hours, and cool down to room temperature;

[0050] ④ Mix the above carbonized product with a V-type mixer at 25r / min for 60min and pass through a 250-mesh sieve to obtain the mater...

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Abstract

The invention relates to the field of lithium batteries, and especially relates to a high-capacity, high-compaction and quick-charge composite graphite negative electrode material. Artificial graphiteand natural graphite single particles are tightly anchored together through amorphous carbon to form a composite graphite secondary particle structure, and a layer of amorphous carbon is applied between the artificial graphite and the natural graphite particles and on the surface of each component particle in a coating manner. The defect that a graphite negative electrode material developed in the prior art cannot give consideration to high capacity, high compaction or quick charging performance is overcome, the advantages of the natural graphite are utilized to ensure the high capacity and high compaction performance of the material, meanwhile, the natural graphite is compounded with the artificial graphite with partial isotropy to buffer the expansion of the natural graphite, and the layer of amorphous carbon is formed between the artificial graphite and the natural graphite particles and on the surface of each single particle, so that the migration rate of lithium ions between thesurface of the graphite and different graphite is increased while the surface defects of the natural graphite are improved.

Description

technical field [0001] The invention relates to the field of lithium batteries, in particular to a high-capacity, high-compaction, fast-charging composite graphite negative electrode material and a preparation method thereof. Background technique [0002] With the increasing demand for pure electric vehicles and hybrid vehicles, while pursuing the high-capacity performance of lithium batteries, it also puts forward extremely high requirements for fast charging performance. In the power battery process, in order to achieve higher energy density, the compaction density and coating surface density of the pole piece are increased, which greatly negatively affects the fast charging performance of the battery. Therefore, it is extremely important to develop a fast-charging graphite with high capacity and high compaction. [0003] Graphite materials have become the most commonly used commercial anode materials for lithium-ion batteries due to their high energy density, good electr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B32/21H01M4/36H01M4/587
CPCC01B32/21H01M4/366H01M4/587H01M10/0525H01M2004/021H01M2004/027Y02E60/10
Inventor 苏敏李慧单沈桃张小祝
Owner WANXIANG 123 CO LTD
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