Method for preparing lithium iron phosphate/carbon composite material of lithium ion battery

[0025] The preparation method of lithium iron phosphate / carbon composite material of lithium ion battery firstly prepares a stable suspension graphene-water system. The concentration of graphene in the system is 1%. Firstly, the natural graphite is crushed to an average particle size of about 1 micron, then added to distilled water, 0.1% of the surfactant phenylenediamine is added, and the temperature is increased to 180°C under high-speed shearing and stirring. Stirring is continued for 6 hours under high temperature and high pressure, and the temperature is lowered to obtain a stable suspension graphene-water system.

[0026] The pure lithium iron phosphate is crushed to an average particle size of 1 micron, and purified water is added according to the ratio of lithium iron phosphate: water = 1:1. Under stirring, 0.01% by weight of the coupling agent γ-mercaptopropyltrimethoxysilane is added to enhance the adsorption capacity of the lithium iron phosphate material on graphene,...

[0028] The preparation method of lithium iron phosphate / carbon composite material of lithium ion battery firstly prepares a stable suspension graphene-water system. The concentration of graphene in the system is generally 10%. Firstly, the natural graphite is crushed to an average particle size of 5 microns, and then added to purified water, added with 5% polyvinylpyrrolidone as a surfactant, and sealed and heated to 250°C under high-speed shear stirring. Stirring was continued for 2 hours under high temperature and high pressure, and the temperature was lowered to obtain a stable suspension graphene-water system.

[0029] The pure lithium iron phosphate is crushed to an average particle size of 5 microns, and purified water is added according to the ratio of lithium iron phosphate: water = 1:10. Under stirring, add 1% by weight of the coupling agent methyl isobutyl ketoxime silane to enhance the adsorption capacity of the lithium iron phosphate material on graphene, and stir un...

[0031] The preparation method of lithium iron phosphate / carbon composite material of lithium ion battery firstly prepares a stable suspension graphene-water system. The concentration of graphene in the system is 2%. First, the natural graphite is crushed to an average particle size of 2 microns, and then added to purified water, and 1% of the surfactant alkylphenol polyoxyethylene ether is added. Under high-speed shearing and stirring, the temperature is sealed and heated to 200°C. Stirring is continued for 4 hours under high temperature and high pressure, and the temperature is lowered to obtain a stable suspension graphene-water system.

[0032] Crush the pure lithium iron phosphate to an average particle size of 3 microns, and add pure water according to the ratio of lithium iron phosphate: water = 1:5. Under stirring, add 0.1% by weight of the coupling agent vinyl triethoxy silane to enhance the adsorption capacity of the lithium iron phosphate material on graphene, and stir...