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Graphite compound modification method and lithium ion battery anode material preparation method

A compound modification and graphite technology, which is applied in the direction of battery electrodes, circuits, electrical components, etc., can solve the problems of poor cycle life and electrochemical performance, improve charge-discharge specific capacity and reversible capacity, inhibit loosening and falling off, reduce embedding and The effect of resistance to dislodgement

Inactive Publication Date: 2012-07-04
河源市天恒金科技有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The natural graphite treated by the modification technology still has the electrochemical performance of relatively poor cycle life and high current discharge in the lithium battery as the negative electrode material.

Method used

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  • Graphite compound modification method and lithium ion battery anode material preparation method
  • Graphite compound modification method and lithium ion battery anode material preparation method
  • Graphite compound modification method and lithium ion battery anode material preparation method

Examples

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Effect test

example 1

[0061] Example 1 The method of composite modification of graphite

[0062] The method for composite modification of graphite in the specific example of the present invention is mainly as follows:

[0063] 1. The process of oxidation modification mainly includes the following steps:

[0064] (1) Natural graphite is crushed and ball milled, and the ball milling time is referred to Table 2 respectively;

[0065] (2) Put the natural graphite after ball milling in a three-necked flask with concentrated nitric acid, preferably 63% concentrated nitric acid (analytical pure), stir at high speed at different temperatures, reflux reaction, 4h, reaction temperature 80 ℃ ~ 150 ℃, respectively Refer to Table 2;

[0066] (3) react the natural graphite after the reaction with the complexing agent propenylamine (EDPA) for 90min and cool to room temperature, wash repeatedly with distilled water to pH=7, and the mass percentage of graphite in the complexation reaction system is 90-95% ;

[...

example 2

[0078] Preparation of example 2 composite modified material

[0079] Prepare asphalt surface modification solvents with different mass concentrations first, and then slowly add oxidized natural graphite with the best performance to the solvent after the asphalt is completely dissolved in the organic solvent. In the process of adding, a few drops of ethanol can be added to the solution to weaken the surface tension of graphite, so that the asphalt and natural graphite can be mixed evenly; then the graphite-asphalt mixed solution is stirred for several hours, and then the mixed solution is removed and placed in a dry place. Drying in the box; the graphite-pitch mixed solution treated above is dried, sieved, and high-temperature sintered to prepare a negative electrode material for lithium-ion batteries, and put into a sealed bag for later use. The specific preparation process of composite modified materials:

[0080] 1. First add a certain amount of carbon disulfide and other o...

example 3

[0084] Example 3 Making a battery

[0085] The graphite obtained by the above method of composite modification is used as an active material, and the process for further preparing lithium-ion battery electrode materials is as follows:

[0086] (1) Provide the chemical reagents used

[0087] 63% concentrated nitric acid (analytical grade), asphalt, carboxymethyl cellulose (CMC), lithium cobaltate (LiCoO 2 ), polyvinylidene fluoride (PVDF), ethylene oxide, N-methylpyrrolidone (NMP), acetylene black (AB), styrene-butadiene rubber (SBR), super conductive carbon black BP-2000, the electrolyte is South Korea's Samsung The company's production and diaphragm are Celgard2400 microporous films.

[0088] (2) Preparation process of negative electrode material

[0089] Dissolve the mixed preparation of styrene-butadiene rubber (SBR) and carboxymethyl cellulose (CMC) (the proportion of SBR and CMC is 2.5:1.5) in distilled water, and make a viscose with a small amount of ethylene oxide af...

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Abstract

The invention relates to a graphite compound modification method, which mainly comprises the graphite oxidative modification technology and the graphite coating modification technology. The graphite oxidative modification technology further comprises the following steps: graphite is smashed and subject to ball milling and oxidation reaction together with concentrated nitric acid in a certain temperature. The graphite coating modification technology further comprises the following steps: a surface finishing solvent containing asphalt is prepared; graphite is coated in the surface finishing solvent; and the graphite and asphalt mixture is subject to heat treatment. The prepared compound modified graphite serves as an active material to further prepare an electrode material for a lithium ion battery. According to the method provided by the invention, the capacity per gram and cycle life of natural graphite are effectively improved and prolonged respectively.

Description

technical field [0001] The invention relates to new products in the field of chemical energy and environmental protection, in particular to a graphite composite modification method and a preparation method of lithium battery electrode materials. Background technique [0002] At present, natural graphite is treated with coating modification technology (abbreviated as BF, the same below) and oxidation modification technology (abbreviated as YH, the same below), and the natural graphite processed by these two technologies can be used as lithium battery negative electrode materials have been widely used. The electrochemical impedance of the natural graphite treated by the two modification technologies is reduced, such as figure 1 . [0003] In addition if figure 2 As shown, the surface of natural graphite treated by the two modification techniques changed from figure 2 (A) and figure 2 (B) It can be seen that: figure 2 In (A), the surface of the original natural graphi...

Claims

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Application Information

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IPC IPC(8): H01M4/62H01M4/38
CPCY02E60/12Y02E60/10
Inventor 陈骏陈猛
Owner 河源市天恒金科技有限公司
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