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Method for producing graphite negative-electrode material by using needle coke, and negative-electrode material

A graphite negative electrode and needle coke technology, which is applied in chemical instruments and methods, battery electrodes, electrochemical generators, etc., can solve the problems of reduced high-rate discharge performance, low specific surface area, and high compaction density of negative graphite materials. High tap density, small specific surface area and excellent performance

Active Publication Date: 2018-07-27
衢州市衢发瑞新能源材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The lithium ion battery negative electrode graphite material of the present invention has high compaction density, low specific surface area, high discharge capacity and long cycle life, but the large rate discharge performance obtained by this method is reduced

Method used

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  • Method for producing graphite negative-electrode material by using needle coke, and negative-electrode material
  • Method for producing graphite negative-electrode material by using needle coke, and negative-electrode material
  • Method for producing graphite negative-electrode material by using needle coke, and negative-electrode material

Examples

Experimental program
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Effect test

Embodiment 1

[0046] A method for utilizing needle coke to produce a graphite negative electrode material, comprising the following steps:

[0047] Pulverization: put the needle-shaped coke powder below 3mm into an airflow mill for pulverization, and pulverize it to a particle state of more than 10μm;

[0048] Spheroidization: The granular needle coke above 10μm is shaped by a crusher and ground into a spherical or ellipsoidal shape;

[0049] Screening: The spheroidized needle coke is screened by a crusher to obtain needle coke with a particle size of 10-15 μm, 15-25 μm and 25-30 μm, parts by weight: 13 parts for 10-15 μm, 15- 25μm is 52 parts, 25-30μm is 30 parts;

[0050] Ingredients: put the needle coke with a particle size of 10-15μm into the needle coke with a particle size of 15-25μm for mixing, mix evenly to get mixed powder A, then pour 1 / 3 parts by weight of the mixed powder A, after stirring evenly, finally pour the remaining mixed powder A into it for mixing;

[0051] Coating...

Embodiment 2

[0055] A method for utilizing needle coke to produce a graphite negative electrode material, comprising the following steps:

[0056] Pulverization: put the needle-shaped coke powder below 3mm into an airflow mill for pulverization, and pulverize it to a particle state of more than 10μm;

[0057] Spheroidization: The granular needle coke above 10μm is shaped by a crusher and ground into a spherical or ellipsoidal shape;

[0058] Screening: The spheroidized needle coke is screened by a crusher to obtain needle coke with a particle size of 10-15 μm, 15-25 μm and 25-30 μm, parts by weight: 10 parts for 10-15 μm, 15- 50 parts for 25μm, 20 parts for 25-30μm;

[0059] Ingredients: put the needle coke with a particle size of 10-15μm into the needle coke with a particle size of 15-25μm for mixing, mix evenly to get mixed powder A, then pour 1 / 3 parts by weight of the mixed powder A, after stirring evenly, finally pour the remaining mixed powder A into it for mixing;

[0060] Coati...

Embodiment 3

[0064] A method for utilizing needle coke to produce a graphite negative electrode material, comprising the following steps:

[0065] Pulverization: put the needle-shaped coke powder below 3mm into an airflow mill for pulverization, and pulverize it to a particle state of more than 10μm;

[0066] Spheroidization: The granular needle coke above 10μm is shaped by a crusher and ground into a spherical or ellipsoidal shape;

[0067] Screening: The spheroidized needle coke is screened by a crusher to obtain needle coke with a particle size of 10-15 μm, 15-25 μm and 25-30 μm, parts by weight: 15 parts for 10-15 μm, 15 parts for 15- 55 parts for 25μm, 35 parts for 25-30μm;

[0068] Ingredients: put the needle coke with a particle size of 10-15μm into the needle coke with a particle size of 15-25μm for mixing, mix evenly to get mixed powder A, then pour 1 / 2 parts by weight of the mixed powder A, after stirring evenly, finally pour the remaining mixed powder A into it for mixing;

...

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Abstract

The invention specifically relates to a method for producing a graphite negative-electrode material by using needle coke, and the negative-electrode material, belonging to the field of graphite negative-electrode materials. According to the method, needle coke is subjected to crushing, spheroidizing, screening, batching, coating, graphitization and screening successively so as to obtain the graphite negative-electrode material. In the step of batching, 10 to 15 parts of needle coke with a particle size in a range of 10 to 15 [mu]m, 50 to 55 parts of needle coke with a particle size in a rangeof 15 to 25 [mu]m and 20 to 35 parts of needle coke with a particle size in a range of 25 to 30 [mu]m. The invention has the beneficial effects that needle coke with three different particle sizes isused for preparing the carbon negative-electrode material, and small-particle-size needle coke which is large in specific surface area, short in the path that lithium ions take to enter particle centers and small in resistance is mixed with larger-particle-size needle coke which is small in specific surface area, long in the path that lithium ions take to enter particle centers and large in resistance, so the advantages of the small-particle-size needle coke and the larger-particle-size needle coke complement each other; and thus, the coated integral needle coke has large tap density and smallspecific surface area, and better facilitates preparation of the negative-electrode material with excellent performance.

Description

technical field [0001] The invention belongs to the field of graphite negative electrode materials, and in particular relates to a method for producing graphite negative electrode materials by utilizing needle coke and the negative electrode materials. Background technique [0002] Lithium-ion battery is a representative of contemporary high-performance batteries, a green new energy product, widely used in information, telecommunications and power industries. With the global consumption of petroleum energy and the intensification of air pollution, energy-saving and environmentally friendly pure electric vehicles have been recognized as the main direction of the development of the automobile industry in the 21st century. The most critical part of a pure electric vehicle is the battery module, which is composed of single batteries connected in series and parallel. The single lithium-ion battery becomes the most critical part. Lithium-ion batteries have attracted the attentio...

Claims

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Application Information

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IPC IPC(8): C01B32/205H01M4/587H01M10/0525
CPCC01B32/205H01M4/587H01M10/0525Y02E60/10
Inventor 杨晓峰李军李园林徐保国
Owner 衢州市衢发瑞新能源材料有限公司
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