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Graphene battery negative electrode composite material

A battery negative electrode and composite material technology, applied in the direction of battery electrodes, circuits, electrical components, etc., can solve the problems of unsatisfactory dispersion effect, affecting the electrical properties of graphene, poor stability of graphene, etc., to achieve high capacity and cycle stability, Improve electrical performance, uniform dispersion effect

Active Publication Date: 2017-12-22
贵州中时烯材科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the method of adding a dispersant is usually used for dispersion. Commonly used dispersants include sodium dodecylbenzenesulfonate or polyvinylpyrrolidone, etc., but the dispersion effect is not ideal, and the dispersed graphene has poor stability, which affects the graphite. The electrical properties of ene

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  • Graphene battery negative electrode composite material

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Effect test

Embodiment 1

[0028] A graphene battery negative electrode composite material is obtained by sequentially coating carbon and silicon carbide on the surface of graphene, wherein the mass ratio of graphene, carbon and silicon carbide is 1:0.08:0.15.

[0029] The preparation method of above-mentioned a kind of graphene battery negative electrode composite material, concrete steps are as follows:

[0030] (1) Dispersed graphene: graphene is uniformly dispersed in ethylene glycol under the action of polyoxyethylene castor oil;

[0031] (2) Coated carbon: Add the dispersed graphene obtained in step (1) into the organic carbon source aqueous solution, stir for 3 hours, continue stirring at 110°C to evaporate the solvent, and then pyrolyze at 800°C for 5 hours to obtain the carbon coated covered graphene;

[0032] (3) Coated silicon carbide: place silicon carbide and carbon-coated graphene obtained in step (1) together in a ball mill for grinding, place the obtained powder in a tube furnace for he...

Embodiment 2

[0041] A graphene battery negative electrode composite material is obtained by sequentially coating carbon and silicon carbide on the surface of graphene, wherein the mass ratio of graphene, carbon and silicon carbide is 1:0.1:0.25.

[0042] The preparation method of above-mentioned a kind of graphene battery negative electrode composite material, concrete steps are as follows:

[0043] (1) Dispersed graphene: graphene is uniformly dispersed in ethylene glycol under the action of polyoxyethylene castor oil;

[0044] (2) Coated carbon: Add the dispersed graphene obtained in step (1) into the organic carbon source aqueous solution, stir for 4 hours, continue stirring at 120°C to evaporate the solvent, and then pyrolyze it at 1000°C for 8 hours to obtain the carbon coated covered graphene;

[0045] (3) Coated silicon carbide: place silicon carbide and carbon-coated graphene obtained in step (1) together in a ball mill for grinding, place the obtained powder in a tube furnace for...

Embodiment 3

[0054] A graphene battery negative electrode composite material is obtained by sequentially coating carbon and silicon carbide on the surface of graphene, wherein the mass ratio of graphene, carbon and silicon carbide is 1:0.08:0.25.

[0055] The preparation method of above-mentioned a kind of graphene battery negative electrode composite material, concrete steps are as follows:

[0056] (1) Dispersed graphene: graphene is uniformly dispersed in ethylene glycol under the action of polyoxyethylene castor oil;

[0057] (2) Coated carbon: Add the dispersed graphene obtained in step (1) into the organic carbon source aqueous solution, stir for 3 hours, continue stirring at 120°C to evaporate the solvent, and then pyrolyze it at 800°C for 8 hours to obtain the carbon coated covered graphene;

[0058] (3) Coated silicon carbide: place silicon carbide and carbon-coated graphene obtained in step (1) together in a ball mill for grinding, place the obtained powder in a tube furnace for...

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Abstract

The invention discloses a graphene battery negative electrode composite material, which is obtained by sequentially coating the surface of graphene with carbon and silicon carbide, wherein the mass ratio of graphene to carbon to silicon carbide is 1: 0.08-0.1 : 0.15-0.25. The graphene battery negative electrode composite material has higher first coulombic efficiency, reduces the amount of a positive electrode material, and further reduces the cost of an entire battery. The surface of the graphene is sequentially coated with the carbon and the silicon carbide, the graphene battery negative electrode composite material has the characteristics of high capacity and high cycle stability. Polyoxyethylated castor oil is used as a dispersing agent in dispersion of the graphene in the preparation method, the graphene is uniformly dispersed by control of the dosage of the dispersing agent, and the electrical property is improved.

Description

technical field [0001] The invention belongs to the technical field of electrode materials, and in particular relates to a graphene battery negative electrode composite material. Background technique [0002] Graphene has excellent mechanical, electrical, thermal and antibacterial properties, and its resistivity is lower than that of copper or silver, making it the material with the smallest resistivity in the world. [0003] In recent years, graphene, as a new type of carbon anode material, has attracted more and more attention. It greatly improves the specific capacity of the anode material, which is much higher than the charge and discharge capacity of the commercial graphite anode in tens of minutes. Therefore, graphene-based batteries have great application prospects. [0004] However, there are still many problems to be solved for graphene to move from the laboratory to commercial application, especially the low coulombic efficiency of graphene for the first time, whi...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/583H01M4/62
CPCH01M4/366H01M4/583H01M4/62Y02E60/10
Inventor 冯岩李世刚
Owner 贵州中时烯材科技有限公司
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