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Method for producing lithium ion battery negative electrode material by asphalt secondary coating process

A technology for lithium-ion batteries and negative electrode materials, which can be applied to battery electrodes, circuits, electrical components, etc.

Active Publication Date: 2019-03-15
WEIFANG HUICHENG NEW MATERIAL TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The invention proposes a method for producing lithium-ion battery negative electrode materials by asphalt secondary coating process, which solves the problem of decreased electrochemical performance of lithium-ion battery negative electrode materials in the prior art

Method used

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  • Method for producing lithium ion battery negative electrode material by asphalt secondary coating process

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Experimental program
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Effect test

Embodiment 1

[0019] The method for producing a lithium ion battery negative electrode material by the pitch secondary coating process of the present invention comprises the following sequential steps:

[0020] S1. After the needle coke is crushed, the particles are shaped and the edges are removed, the particles are made as round as possible to reduce the fusion resistance between the particles and the asphalt powder, and the asphalt powder with a particle size of 20 μm is mixed with the asphalt powder with a particle size of 20 μm in a mixer for 20 minutes to obtain a mixture A. , in mixture A, the volume ratio of asphalt powder is 8%;

[0021] S2. The mixture A is subjected to surface modification and fusion treatment respectively to obtain a primary asphalt-coated material, wherein the surface modification can improve the activity of carbon, and the fusion treatment can make the material evenly distributed, and then enter the kiln in high-purity N 2 After being graphitized at a high tem...

Embodiment 2

[0025] The method for producing a lithium ion battery negative electrode material by the pitch secondary coating process of the present invention comprises the following sequential steps:

[0026] S1. After the needle coke is crushed, the particles are shaped and the edges are removed, the particles are made as round as possible to reduce the fusion resistance between the particles and the asphalt powder, and the asphalt powder with a particle size of 30 μm is mixed with the asphalt powder with a particle size of 30 μm in a mixer for 25 minutes to obtain a mixture A. , in mixture A, the volume ratio of asphalt powder is 8%;

[0027] S2. The mixture A is subjected to surface modification and fusion treatment respectively to obtain a primary asphalt-coated material, wherein the surface modification can improve the activity of carbon, and the fusion treatment can make the material evenly distributed, and then enter the kiln in high-purity N 2 After being graphitized at a high tem...

Embodiment 3

[0031] The method for producing a lithium ion battery negative electrode material by the pitch secondary coating process of the present invention comprises the following sequential steps:

[0032] S1. After the needle coke is crushed, the particles are shaped and the edges are removed, the particles become as round as possible, reducing the fusion resistance between the particles and the asphalt powder, and mixing with the asphalt powder with a particle size of 40 μm in a mixer for 30 minutes to obtain a mixture A , in mixture A, the volume ratio of asphalt powder is 8%;

[0033] S2. The mixture A is subjected to surface modification and fusion treatment respectively to obtain a primary asphalt-coated material, wherein the surface modification can improve the activity of carbon, and the fusion treatment can make the material evenly distributed, and then enter the kiln in high-purity N 2 After being graphitized at a high temperature of 800°C under the protection, it is cooled t...

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Abstract

The invention proposes a method for producing a lithium ion battery negative electrode material by an asphalt secondary coating process. By the method, the problem that the electrochemical performanceof the lithium ion battery negative electrode material in the prior art is solved. The method comprises the following sequential steps of S1, mixing needle coke after being smashed and asphalt powderwith grain size being 20-40 micrometers for 20-30 minutes by a mixing machine to obtain a mixture A; S2, performing surface modification and fusion on the mixture A to obtain a primary asphalt coating material, allowing the primary asphalt coating material to enter a furnace for high-temperature graphitization at 800 DEG C under protection of high-pure N2, and cooling to a room temperature to obtain a material B; S3, smashing and classifying the material B, and mixing the material and asphalt powder with grain size being 2-5 micrometers again for 30-40 minutes by the mixing machine to obtaina material C; and S4, fusing the material C to obtain a secondary asphalt coating material, sending the secondary asphalt coating material to another one furnace for high-temperature carbonization at3,000 DEG C under protection of high-pure N2, and removing tar contained in the material C, thereby obtaining the lithium ion battery negative electrode material.

Description

technical field [0001] The invention relates to the technical field of lithium ion battery production, in particular to a method for producing a lithium ion battery negative electrode material through a secondary coating process of asphalt. Background technique [0002] Lithium-ion battery anode materials generally need to go through the process of raw material pulverization, particle shaping, coating modification, graphitization, fusion and carbonization. The asphalt coating process is a common process step, but the traditional coating process has asphalt The problems of uneven, non-dense, and incomplete coating lead to low electrochemical performances such as initial charge-discharge efficiency, specific capacity, and cycle performance after being used as a negative electrode material for lithium-ion batteries. SUMMARY OF THE INVENTION [0003] The present invention proposes a method for producing a negative electrode material of a lithium ion battery through a secondary...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/62
CPCH01M4/624H01M4/625Y02E60/10
Inventor 王金山
Owner WEIFANG HUICHENG NEW MATERIAL TECH
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