Graphene composite lithium cobalt oxide cathode material and preparation method thereof

A graphene composite and positive electrode material technology, applied in graphene, battery electrodes, electrical components, etc., can solve the problems of low battery capacity, poor battery conductivity, and large internal resistance of the battery, and achieve the effect of increasing battery capacity

Inactive Publication Date: 2018-02-27
长沙仲善新能源科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The technical problem to be solved in the present invention is to provide a graphene-composite lithium cobaltate positive electrode material and a preparation method thereof, so as to solve the problem of low battery capacit...

Method used

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  • Graphene composite lithium cobalt oxide cathode material and preparation method thereof
  • Graphene composite lithium cobalt oxide cathode material and preparation method thereof

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preparation example Construction

[0027] The preparation method of the lithium cobaltate cathode material of described graphene composite comprises the following steps:

[0028] S1. Graphene modification: Stir and react graphene and water-based acrylic polyurethane at a temperature of 30-35°C for 20-30 minutes, add 30-50 parts of deionized water, raise the temperature to 80-90°C and stir for 15 minutes, then add fluorine base alkyl polyether, and react for 35-45min under the conditions of ultrasonic power of 420-580W, temperature of 105-135°C, and rotation speed of 160-310r / min, until no particles exist in the solution, and the solution is light yellow. After 15-20min, the precipitated substance was removed to obtain a graphene modified solution;

[0029] S2, powder grinding: grind the prepared lithium cobalt oxide, copper and silver powder, and pass the mixed metal powder through a 500-800 mesh sieve to obtain a mixed powder;

[0030] S3. Prepare solution: add the mixed powder prepared in step S2 to the grap...

Embodiment 1

[0035]A graphene composite lithium cobaltate positive electrode material, in parts by weight, comprising the following raw materials: 25 parts of lithium cobaltate, 2.5 parts of water-based acrylic polyurethane, 4 parts of copper, 0.2 parts of graphene, 1.2 parts of fluoroalkyl polyether 1 part, 1 part of chlorinated polyethylene, 0.3 part of Ketjen black, 1 part of vinyl chloride vinyl acetate copolymer, 0.6 part of ethylene bis stearamide, 1 part of ethyl acrylate regulator, 2 parts of silver powder, dispersant POLYRON 2 share;

[0036] The preparation method of the lithium cobaltate cathode material of described graphene composite comprises the following steps:

[0037] S1. Graphene modification: Stir graphene and water-based acrylic polyurethane at a temperature of 30°C for 30 minutes, add 30 parts of deionized water, raise the temperature to 80°C and stir for 15 minutes, then add fluoroalkyl polyether, and The ultrasonic power was 420W, the temperature was 105°C, and the...

Embodiment 2

[0043] A graphene composite lithium cobaltate positive electrode material, in parts by weight, comprising the following raw materials: 29 parts of lithium cobaltate, 2.8 parts of water-based acrylic polyurethane, 5 parts of copper, 0.3 parts of graphene, 1.3 parts of fluoroalkyl polyether 1.4 parts of chlorinated polyethylene, 0.4 parts of ketjen black, 1.5 parts of vinyl chloride vinyl acetate copolymer, 0.8 parts of ethylene bis stearamide, 1.2 parts of 2-methyl methacrylate regulator, 3 parts of silver powder, 3 parts of dispersant POLYRON;

[0044] The preparation method of the lithium cobaltate cathode material of described graphene composite comprises the following steps:

[0045] S1. Graphene modification: Stir graphene and water-based acrylic polyurethane at a temperature of 31°C for 28 minutes, add 35 parts of deionized water, raise the temperature to 81°C and stir for 15 minutes, then add fluoroalkyl polyether, and The ultrasonic power was 450W, the temperature was ...

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Abstract

The invention discloses a graphene composite lithium cobalt oxide cathode material and a preparation method thereof. The graphene composite lithium cobalt oxide cathode material comprises the following raw materials: lithium cobalt oxide, water-based acrylic polyurethane, copper, grapheme, fluoroalkyl polyether, chlorinated polyethylene, ketjenblack, a chloroethylene vinyl acetate copolymer, ethylene distearic amide, an acrylate regulator, silver powder and a dispersing agent POLYRON. The graphene composite lithium cobalt oxide cathode material is prepared by the steps of graphene modification, powder grinding, solution preparation, calcining, grinding and the like. The graphene composite lithium cobalt oxide cathode material disclosed by the invention has the benefits that the battery capacity can be significantly improved, the battery internal resistance is reduced, and the battery conductivity is improved.

Description

【Technical field】 [0001] The invention belongs to the technical field of cathode materials, and in particular relates to a graphene-composite lithium cobalt oxide cathode material and a preparation method thereof. 【Background technique】 [0002] With the rapid development of portable electronic devices, the demand for renewable, high-energy and long-life batteries in the energy market is increasing, and lithium-ion batteries, as the battery with the highest voltage and the highest energy density, have good development prospects . [0003] In lithium-ion batteries, the cathode material is the most important component and the key to determining the performance of lithium-ion batteries. Lithium cobalt oxide, lithium vanadium phosphate and lithium iron phosphate have been widely used as cathode materials. Lithium cobalt oxide (LiCoO 2 ) has an average output voltage of 3.7V, an energy density as high as 140mAh / g, and has the advantages of good cycle performance and thermal st...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/583H01M4/62H01M10/0525C01B32/182
CPCH01M4/362H01M4/583H01M4/625H01M10/0525Y02E60/10
Inventor 不公告发明人
Owner 长沙仲善新能源科技有限公司
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