▎ 摘　　要

NOVELTY - A porous graphene coated modified lithium-ion battery anode material comprises a lithium-ion powder, a porous modified graphene powder having a specific capacity of 140 mA.hour/g, and a graphene-doped lithium iron phosphate coating material powder. The lithium ion powder is also doped with magnesium ions or calcium ions. USE - Porous graphene coated modified lithium-ion battery anode material. ADVANTAGE - The porous graphene coated modified lithium-ion battery anode material has excellent cycle stability, chemical stability, mechanical property and electronic conductivity; and is simple to prepare and easy to operate. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is included for a method for preparing the porous graphene coated modified lithium-ion battery anode material, which involves: (S1) preparing a porous modified graphene by adding 200-400 mg graphene powder to 50 ml 5 mol/l potassium hydroxide solution, magnetically stirring at room temperature for 10-15 hours, leaving still for 24-36 hours, filtering off the excess potassium hydroxide solution by suction filtration, placing the treated graphene in a tubular furnace, calcining at 800-1000 degrees C for 1-3 hours under the protection of an inert gas, washing 3-5 times with 3-5% hydrogen chloride solution and distilled water to produce a porous graphene, placing the porous graphene and polydimethylsiloxane under closed conditions, calcining at 200-300 degrees C for 1-3 hours, and carrying out hydrophobic modification on the calcined porous graphene; (S2) preparing a graphene-doped lithium iron phosphate coating material powder by putting the porous modified graphene powder into a ball mill tank, adding an appropriate amount of grinding balls and ethanol to the tank, then adding lithium iron phosphate powder, carrying out ball milling, taking out the sample after the ball milling is completed, placing the sample in an electric blast drying oven, drying at 50-60 degrees C, then placing the mixed powder in a vapor deposition apparatus, vacuumizing the apparatus, then carrying out nitrogen treatment on the apparatus to ensure that the reaction device is in a nitrogen atmosphere, setting the reaction temperature to 800-1000 degrees C, adding benzene and catalyst to the apparatus, heat preserving, cooling to room temperature and then taking out; and (S3) mixing the graphene-doped lithium iron phosphate coating material powder, graphene powder and binder in a mass ratio of 8:2:1, then scraping the prepared slurry, pressing the slurry into an electrode plate by using a mold, pressing the electrode plate on aluminum foil and vacuum-drying.