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Fast-charging, high-compaction and high-capacity artificial graphite negative electrode material and preparation method thereof

An artificial graphite negative electrode and high-capacity technology, applied in the preparation/purification of graphite and carbon, chemical instruments and methods, etc., can solve the problems of unsatisfactory fast charging performance, failure to achieve high capacity, high compaction and fast charging performance, etc. Achieve the effects of shortening the transmission path, ensuring fast charging performance, and ensuring compaction density

Pending Publication Date: 2021-11-26
石家庄尚太科技股份有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the capacity has been improved, its rate can only reach 1C, and the fast charging performance still cannot meet the needs of the current market
[0006] That is, in the prior art, although high-capacity, high-compaction or fast-charging graphite negative electrodes have been prepared, none of them have achieved both high-capacity, high-compaction and fast-charging performance.

Method used

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  • Fast-charging, high-compaction and high-capacity artificial graphite negative electrode material and preparation method thereof
  • Fast-charging, high-compaction and high-capacity artificial graphite negative electrode material and preparation method thereof
  • Fast-charging, high-compaction and high-capacity artificial graphite negative electrode material and preparation method thereof

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Embodiment 1

[0035] The present embodiment provides a method for preparing a fast-charging and high-capacity artificial graphite negative electrode material, comprising the following steps:

[0036] (1) pulverizing treatment: the petroleum coke is subjected to mechanical pulverization to obtain a pulverized material with a particle size D50 of 5 μm;

[0037] (2) Surface treatment: the pulverized material is subjected to shaping equipment, and the excessive fine powder and the edges and corners of the particles are removed under the condition of a rotating speed of 30 r / min, and the surface morphology of the particles is shaped and modified to obtain modified materials;

[0038] (3) granulation: the modified material and asphalt are uniformly mixed at a ratio of 100:3, added to a vertical kettle, and granulated at 500° C. for 6 hours to obtain a granulated material with a particle size D50 of 15 μm;

[0039] (4) Graphitization: the granulated material is subjected to high-temperature graphi...

Embodiment 2

[0042] The present embodiment provides a method for preparing a fast-charging and high-capacity artificial graphite negative electrode material, comprising the following steps:

[0043] (1) Milling treatment: the needle coke is subjected to mechanical grinding to obtain a pulverized material with a particle size D50 of 15 μm;

[0044] (2) Surface treatment: the pulverized material is subjected to shaping equipment, and the excessive fine powder and the edges and corners of the particles are removed under the condition of a rotating speed of 50 r / min, and the surface morphology of the particles is shaped and modified to obtain modified materials;

[0045] (3) granulation: the modified material and coal tar are uniformly mixed at a ratio of 100:10, added to a horizontal kettle, and granulated at 600° C. for 7 hours to obtain a granulated material with a particle size D50 of 30 μm;

[0046] (4) Graphitization: the granulated material is subjected to high-temperature graphitizatio...

Embodiment 3

[0049] The present embodiment provides a method for preparing a fast-charging and high-capacity artificial graphite negative electrode material, comprising the following steps:

[0050] (1) pulverizing treatment: the calcined coke is subjected to mechanical pulverization to obtain a pulverized material with a particle size D50 of 7 μm;

[0051] (2) Surface treatment: the pulverized material is subjected to shaping equipment, and the excessive fine powder and the edges and corners of the particles are removed under the condition of a rotating speed of 40 r / min, and the surface morphology of the particles is shaped and modified to obtain modified materials;

[0052] (3) granulation: the modified material and resin are uniformly mixed at a ratio of 100:18, added to a horizontal kettle, and granulated at 450° C. for 8 hours to obtain a granulated material with a particle size D50 of 22 μm;

[0053] (4) Graphitization: the granulated material is subjected to high-temperature graphi...

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Abstract

The invention relates to a fast-charging, high-compaction and high-capacity artificial graphite negative electrode material and a preparation method thereof. The preparation method comprises the steps of raw material crushing treatment, raw material surface treatment, granulation, graphitization and carbon coating. According to the fast-charging, high-compaction and high-capacity artificial graphite negative electrode material, the high-capacity characteristic of the material is guaranteed by selecting the easily-graphitized coke as a raw material, and then the raw material is subjected to surface treatment, so that the surface appearance of particles is improved, the particle size distribution of the particles is optimized, and the compaction density of the material is further improved. Through granulation, shortening of a lithium ion transmission path and increase of a lithium ion transmission channel, the surface carbon coats the graphite surface to form a layer of amorphous carbon, the interlayer spacing of the graphite surface is increased, and the transmission resistance of lithium ions on the graphite surface is reduced, so that the fast charging performance is improved.

Description

technical field [0001] The invention belongs to the field of lithium ion battery materials, and in particular relates to a fast-charging high-capacity artificial graphite negative electrode material and a preparation method thereof. Background technique [0002] With the increasing demand for electric vehicles in the market, while pursuing cruising range, it also puts forward extremely high requirements for fast charging performance. As the core component of electric vehicles, power lithium-ion batteries, their energy density and fast charging performance determine the battery life and fast charging performance of electric vehicles. In the power battery process, in order to achieve higher energy density, the method of increasing the compaction density and areal density of the negative pole piece is adopted, which has a great negative impact on the fast charging performance of the power battery. Therefore, it is extremely important to develop a high-compact, high-capacity ar...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B32/205C01B32/21C01B32/05H01M4/583
CPCC01B32/205C01B32/21C01B32/05H01M4/583Y02E60/10
Inventor 魏智伟许晓落吴浩贠晓亮
Owner 石家庄尚太科技股份有限公司
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