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
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[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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