A kind of graphene-modified lithium-ion battery cathode material and its preparation method and application
A lithium-ion battery and graphene modification technology, which is applied in battery electrodes, secondary batteries, circuits, etc., can solve the problems of insufficient combination of graphene and positive active materials, poor conductivity and rate characteristics, etc.
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Embodiment 1
[0057] A graphene-modified lithium-ion battery positive electrode material, its preparation schematic diagram is shown in the attached figure 1 , specifically prepared by the following method:
[0058] (1) Perform plasma treatment on lithium iron phosphate, the specific operation steps are as follows: add lithium iron phosphate powder into the plasma reactor, stir it and keep it constant to 30°C; Into the working gas CF 4 ; The reactor is continuously evacuated to maintain the vacuum degree in the reactor at 0.5Pa; the regulating voltage is 20V, and the electric current is 50mA to generate plasma discharge in the reactor; Lithium is used for surface modification; react for 3 minutes to obtain plasma surface-modified lithium iron phosphate;
[0059](2) 50g of the above-mentioned plasma surface modified lithium iron phosphate and 20g of graphene slurry are compounded in a high-speed dispersing emulsifier, and the compounding time is 1h to obtain a mixed material, and the plasm...
Embodiment 2
[0063] A graphene-modified lithium-ion battery positive electrode material, its preparation schematic diagram is shown in the attached figure 1 , specifically prepared by the following method:
[0064] (1) Perform plasma treatment on lithium iron phosphate, the specific operation steps are as follows: add lithium iron phosphate powder into the plasma reactor, stir it and keep it constant to 30°C; Into the working gas CF 4 ; The reactor is continuously evacuated to maintain the vacuum degree in the reactor at 0.5Pa; the regulating voltage is 20V, and the electric current is 50mA to generate plasma discharge in the reactor; Lithium is used for surface modification; react for 3 minutes to obtain plasma surface-modified lithium iron phosphate;
[0065] (2) 50g of the above-mentioned plasma surface modified lithium iron phosphate and 20g of graphene slurry are compounded in a high-speed dispersing emulsifier, and the compounding time is 1h to obtain a mixed material, and the plas...
Embodiment 3
[0069] A graphene-modified lithium-ion battery positive electrode material, its preparation schematic diagram is shown in the attached figure 1 , specifically prepared by the following method:
[0070] (1) Perform plasma treatment on the nickel-cobalt lithium manganate ternary material, the specific operation steps are as follows: add the nickel-cobalt lithium manganese oxide ternary material into the plasma reactor, stir it and keep it constant to 30°C; The flow rate of liters per minute is fed into the reactor with working gas CF 4 ; The reactor is continuously evacuated to keep the vacuum in the reactor at 0.5Pa; the regulating voltage is 20V, and the electric current is 50mA to generate plasma discharge in the reactor; Lithium manganate ternary material for surface modification; react for 3 minutes to obtain plasma surface modified nickel cobalt lithium manganate ternary material;
[0071] (2) Composite 50g of the above-mentioned plasma surface-modified nickel-cobalt lit...
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