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Preparation method of high-magnification quick-charging graphite negative electrode material

A graphite anode, high-rate technology, applied in battery electrodes, structural parts, electrical components, etc., can solve problems such as the impact of battery safety issues, lithium precipitation, etc., to improve the rate and fast charging performance, improve the conductive network, and electron transmission speed. quick effect

Active Publication Date: 2021-01-29
HEFEI GUOXUAN HIGH TECH POWER ENERGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, many graphite materials in the market are prone to lithium precipitation on the surface of the negative electrode when charging at a high rate, which has a great impact on the safety of the battery cell.

Method used

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  • Preparation method of high-magnification quick-charging graphite negative electrode material

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Effect test

Embodiment 1

[0029] A method for preparing a high-rate fast-charging graphite negative electrode material, comprising the following steps:

[0030] S1. One or more of needle coke, petroleum coke and pitch coke are coarsely crushed and finely ground, and then spheroidized to obtain graphite raw material powder;

[0031] S2, mixing the graphite raw material powder described in step S1 with the first carbon source, heating to a certain temperature in an inert atmosphere for surface coating, and obtaining the first carbon source coated graphite raw material after cooling;

[0032] S3. Carrying out high-temperature carbonization of the first carbon source-coated graphite raw material described in step S2 in an inert atmosphere, and obtaining a primary carbonized material after cooling;

[0033] S4, subjecting the primary carbonized material described in step S3 to high-temperature graphitization treatment, and obtaining artificial graphite powder after cooling;

[0034] S5, mixing the artifici...

Embodiment 2

[0037] A method for preparing a high-rate fast-charging graphite negative electrode material, comprising the following steps:

[0038] S1. Coarsely pulverize the raw needle coke (moisture content is 3%, ash content is 10%) through a jet mill until the particle size distribution D50 is 20-25 μm, and then finely grind it with an ultrafine mill until the particle size distribution D50 is 6 -9 μm, and then use a spheroidizer to perform spheroidization and shaping treatment until the particle size distribution D50 is 5-8 μm to obtain graphite raw material powder;

[0039] S2. Mix the graphite raw material powder obtained in step S1 with pitch coke at a mass ratio of 95:5. In an argon / nitrogen mixed atmosphere, first raise the temperature to 180°C at a heating rate of 2°C / min, keep it warm for 1h, and then Raise the temperature to 280°C at a heating rate of 1.5°C / min, hold for 70 minutes to soften and coat, and then cool to room temperature at a cooling rate of 1.5°C / min to obtain p...

Embodiment 3

[0045] A method for preparing a high-rate fast-charging graphite negative electrode material, comprising the following steps:

[0046] S1. Raw needle coke (moisture content is 3%, ash content is 10%) is coarsely pulverized through a jet mill until the particle size distribution D50 is 20-25 μm, and then finely ground through an ultrafine mill until the particle size distribution D50 is 6 -9 μm, and then use a spheroidizer to perform spheroidization and shaping treatment until the particle size distribution D50 is 5-8 μm to obtain graphite raw material powder;

[0047] S2. Mix the graphite raw material powder obtained in step S1 with pitch coke at a mass ratio of 95:5. In an argon / nitrogen mixed atmosphere, first raise the temperature to 190° C. at a heating rate of 3° C. / min, keep it warm for 30 minutes, and then Raise the temperature to 300°C at a heating rate of 2°C / min, keep warm for 1h to soften and coat, and then cool to room temperature at a cooling rate of 1.5°C / min to ...

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Abstract

The invention discloses a preparation method of a high-magnification quick-charging graphite negative electrode material. The method comprises the following steps: carrying out coarse crushing and fine grinding on one or more of needle coke, petroleum coke and pitch coke, carrying out spheroidizing shaping treatment, mixing with a first carbon source, heating to carry out surface coating, and carrying out high-temperature carbonization; then carrying out high-temperature graphitization treatment to obtain an artificial graphite powder; and mixing the obtained artificial graphite powder with asecond carbon source, heating for surface coating, and carbonizing at a high temperature to obtain the high-magnification quick-charging graphite negative electrode material. The graphite negative electrode material prepared by the invention has the advantages of a high charge-discharge rate, a large discharge gram capacity and good cycle performance, and a battery prepared from the graphite negative electrode material has excellent comprehensive performance.

Description

technical field [0001] The invention relates to the technical field of lithium-ion battery negative electrode graphite materials, in particular to a preparation method of high-rate fast-charging graphite negative electrode materials. Background technique [0002] In recent years, with the development of EV power batteries, in addition to the requirements for long battery life, people also hope to be able to complete 50% Soc replenishment in a short time (20-30min) and complete the final distance during use. Therefore, the demand for fast-charging batteries is getting higher and higher, so fast-charging graphite anode materials are needed for matching. At present, many graphite materials in the market are prone to lithium precipitation on the surface of the negative electrode when charging at a high rate, which has a great impact on the safety of the battery cell. Therefore, how to improve the fast charging ability of the battery cell under the premise of ensuring safety and...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/583H01M4/62H01M10/0525
CPCH01M4/366H01M4/583H01M4/62H01M4/625H01M10/0525Y02E60/10
Inventor 陈晨王叶蔡桂凡林少雄
Owner HEFEI GUOXUAN HIGH TECH POWER ENERGY
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