Preparation method of isotropic graphite material

A graphite material, isotropic technology, applied in electrical components, battery electrodes, circuits, etc., can solve the problems of high processing cost and complicated processing technology, and achieve the effect of less processing equipment, simple process and low cost

Active Publication Date: 2016-01-27
湖南海容新材料有限责任公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a method for preparing an isotropic graphite negative electrode, which overcomes the problems of complex processing technology and high processing cost of isotropic graphite electrode materials in the prior art

Method used

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  • Preparation method of isotropic graphite material

Examples

Experimental program
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Effect test

Embodiment 1

[0023] (1) Add 20g polyvinyl alcohol organic polymer into 2L water and stir for 30 minutes;

[0024] (2) Add 400g of needle coke into the solution containing polyvinyl alcohol and stir for 30 minutes;

[0025] (3) Add 12.7g of ferrous chloride into the above water solvent and stir for half an hour;

[0026] (4) While stirring, add 500mL, 0.3mol / L sodium hydroxide dropwise at 5mL / min to the mixed solution, and stir for 2 hours;

[0027] (5) Filter the above solution, and dry it at 100°C for 5 hours; then raise the temperature to 2800°C at a rate of 3°C / min under the protection of argon atmosphere, keep it warm for 20 hours, and cool it down to below 100°C naturally, take out the material, crush, After sieving, the isotropic graphite lithium ion battery negative electrode material can be obtained.

Embodiment 2

[0029] (1) Add 10g polyvinyl alcohol organic polymer into 2L water and stir for 30 minutes;

[0030] (2) Add 300g of petroleum coke into the solution containing polyvinyl alcohol and stir for 30 minutes;

[0031] (3) Add 12.7g of ferrous chloride into the above water solvent and stir for half an hour;

[0032] (4) While stirring, add 500mL, 0.2mol / L sodium hydroxide dropwise at 5mL / min to the mixed solution, and stir for 2 hours;

[0033] (5) Filter the above solution, and dry it at 100°C for 5 hours; then raise the temperature to 2800°C at a rate of 5°C / min under the protection of argon atmosphere, keep it warm for 25 hours, and then cool it down to below 100°C naturally, take out the material, crush, After sieving, the isotropic graphite lithium ion battery negative electrode material can be obtained.

Embodiment 3

[0035] (1) Add 15g of polyvinylpyrrolidone organic polymer, 500g of petroleum coke, and 26.3g of nickel sulfate into 2L of water and stir for 3 hours;

[0036] (2) While stirring, add 500mL, 0.3mol / L potassium hydroxide dropwise at 3mL / min to the mixed solution, and stir for 2 hours;

[0037] (3) Filter the above solution and dry it at 100°C for 5 hours; then raise the temperature to 3000°C at a rate of 5°C / min under the protection of argon atmosphere, keep it warm for 20 hours, and cool it down to below 100°C naturally, take out the material, crush, After sieving, the isotropic graphite lithium ion battery negative electrode material can be obtained.

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Abstract

The invention relates to a preparation method of a graphite material, in particular to a preparation method of an isotropic graphite material. The method comprises the following steps: (a) adding water-soluble organic polymers, coke and a soluble iron salt and/or nickel salt; (b) dropwise adding an alkali liquor, so that iron or nickel ions are deposited on the graphite surface; (c) filtering and drying sediments; and (d) heating the sediments to 2600-3,000 DEG C in an inert gas protection, carrying out a thermal treatment and then cooling the sediments. The preparation method is simple in process and low in processing cost.

Description

technical field [0001] The invention relates to a preparation method of a graphite material, in particular to a preparation method of an isotropic graphite material. Background technique [0002] Lithium-ion batteries have the advantages of high working voltage, high specific energy, and good safety performance, and are widely used in 3C fields such as mobile communications and notebook computers. At present, the negative electrode materials of lithium batteries on the market are mainly graphite negative electrode materials. During the process of lithium ion intercalation and extraction, the volume change of graphite negative electrode materials is small, so it has good cycle performance. With the development of technology, especially the development of electric vehicles, lithium batteries have become the battery of choice for electric vehicle applications. However, the existing graphite products, especially natural graphite products, are prone to stripping problems due to ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/583C01B31/04
CPCY02E60/10
Inventor 谢呈德龙波许晓落
Owner 湖南海容新材料有限责任公司
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