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Preparation method of high-multiplying-power quick charging graphite cathode material and material

A graphite anode, high-rate technology, applied in battery electrodes, electrical components, electrochemical generators, etc., can solve the problems of complex process and high cost, and achieve the effect of simple process flow, improved isotropy, and reduced cost

Inactive Publication Date: 2018-11-13
DONGGUAN KAIJIN NEW ENERGY TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the current high-magnification materials are basically formed by secondary particle carbonization, but secondary particle carbonization has the disadvantages of coating modification, complicated process, and high cost.

Method used

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  • Preparation method of high-multiplying-power quick charging graphite cathode material and material

Examples

Experimental program
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Effect test

Embodiment 1

[0018] Embodiment 1: The preparation method of a kind of high-magnification fast-charging graphite negative electrode material provided by this embodiment comprises the following steps: pulverize the raw material of petroleum coke, the particle size D50 after pulverization is 3-10um, obtain artificial graphite through graphitization, graphite The melting temperature is 2200°C, and then 97% by weight of artificial graphite and 3% by weight of pitch, a carbon-containing binder, are subjected to mechanical fusion treatment. The speed of mechanical fusion is 300rpm and the time is 18min. Carbonization and sintering treatment was carried out under gas protection for 18 hours, and the carbonization temperature was 900°C. After carbonization treatment, a high-rate fast-charging graphite negative electrode material was obtained.

[0019] A high-rate fast-charge graphite negative-electrode material prepared by the above-mentioned high-rate fast-charge graphite negative-electrode materia...

Embodiment 2

[0020] Example 2: The preparation method of a high-rate fast-charging graphite negative electrode material provided in this example and the high-rate fast-charging graphite negative electrode material obtained by the preparation method include the following steps: pulverize the pitch coke raw material, and after pulverization The particle size D50 is 3-10um, artificial graphite is obtained through graphitization, and the graphitization temperature is 2000°C, and then 99% by weight of artificial graphite and 1% by weight of carbon source binder pitch are subjected to mechanical fusion treatment, and the mechanically fused The rotation speed is 200rpm, and the time is 25min. After that, the fused material is carbonized and sintered for 20h under the protection of an inert gas. The carbonization temperature is 1200°C. After carbonization, a high-rate fast-charging graphite negative electrode material is obtained.

Embodiment 3

[0021] Example 3: The preparation method of a high-rate fast-charging graphite negative electrode material provided in this example and the high-rate fast-charging graphite negative electrode material obtained by the preparation method include the following steps: pulverize the coal coke raw material, and after pulverization, The particle size D50 is 3-10um, artificial graphite is obtained through graphitization, and the graphitization temperature is 2400°C, and then 98% by weight of artificial graphite and 2% by weight of carbon-containing binder pitch are subjected to mechanical fusion treatment, and the mechanically fused The rotation speed is 500rpm, and the time is 5min. After that, the fused material is carbonized and sintered for 15h under the protection of an inert gas. The carbonization temperature is 1000°C. After carbonization, a high-rate fast-charging graphite negative electrode material is obtained.

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Abstract

The invention discloses a preparation method of a high-multiplying-power quick charging graphite cathode material. The preparation method comprises the following steps: smashing a raw material, then graphitizing the raw material to obtain artificial graphite, then adhering the artificial graphite with a carbon source-containing adhesive together for mechanical fusion treatment, and carbonizing themixture to obtain the high-multiplying-power quick charging graphite cathode material. The raw material is one or more of petroleum coke or asphalt coke or coal coke; after the raw material is smashed, the particle size D50 is 3 to 10 [mu]m. Compared with the prior art, the preparation method disclosed by the invention has the advantages that the raw materials such as the petroleum coke are graphitized to obtain the artificial graphite and then are mixed with the adhesive for mechanical fusion, and the mixture is carbonized, so that the whole technological process is simple, and the raw materials are not required to be coated, and the cost is greatly reduced; due to single small particles, channels for allowing lithium ions to get in and get out are relatively short; furthermore, the surface is fused and coated with a layer of amorphous carbon, so that the isotropy of the material is improved, and the obtained graphite cathode material is high in multiplying power and very good in quick charging performance.

Description

technical field [0001] The invention relates to the technical field of lithium-ion battery negative electrode materials, in particular to a preparation method and material of a high-rate fast-charging graphite negative electrode material. Background technique [0002] Lithium-ion batteries have the characteristics of high operating voltage, high energy density, long service life, no memory effect, and low self-discharge, and have become the preferred power source for advanced electronic equipment. With the diversification of people's life and the continuous acceleration of the rhythm, the battery charging time is required to be shorter and shorter, and the negative electrode graphite material is an important part of the lithium-ion battery, which has a greater impact on the charge and discharge characteristics of the battery. It is of great significance to improve the charging characteristics while maintaining superior cycle performance. However, the current high-magnificat...

Claims

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Application Information

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IPC IPC(8): H01M4/583H01M10/0525
CPCH01M4/583H01M10/0525Y02E60/10
Inventor 晏荦许聪智仰韻霖
Owner DONGGUAN KAIJIN NEW ENERGY TECH
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