▎ 摘　　要

NOVELTY - The preparation of anode material involves mixing lithium source, iron source, boron source, graphene and polymer, adding deionized water, stirring, heating, adding graphene, increasing temperature, heating, stirring to obtain viscous material, transferring viscous material to vacuum oven, grinding to obtain precursor powder, dispersing precursor powder with water, ultrasonically treating, removing, filtering, washing, placing in vacuum oven, placing in inert atmosphere, increasing temperature, maintaining at constant temperature, heating, and naturally cooling to room temperature. USE - Preparation method of graphene-coated lithium iron borate anode material for lithium ion battery (claimed). ADVANTAGE - The method enables preparation of graphene-coated lithium iron borate anode material with excellent particle dispersibility, high crystallinity, high purity, high specific capacity, high reversible charge and discharge capacity, and improved electrochemical performance. DETAILED DESCRIPTION - The preparation of anode material involves (1) mixing lithium source, iron source, boron source, graphene and polymer in molar ratio (1-1.05):1:1:(0.05-0.4):(2-4), adding deionized water, uniformly stirring, heating in 60 degrees C water bath for 0.5-2 hours, adding graphene, increasing temperature to 80-120 degrees C, heating in water bath for 1-4 hours, stirring to obtain viscous material, (2) transferring viscous material to vacuum oven at 80-140 degrees C for 6-8 hours, grinding to obtain precursor powder, (3) dispersing precursor powder with water, ultrasonically treating for 5-20 minutes, removing, filtering, washing with deionized water for 1-3 times, washing with ethanol for 1-3 times, (4) placing in vacuum oven at 80-140 degrees C for 4-6 hours, placing in inert atmosphere in tube furnace, where inert atmosphere is argon or nitrogen, increasing temperature to 325-400 degrees C at a rate of 5 degrees C/minute, maintaining at constant temperature for 1-2 hours, heating at 500-700 degrees C at a rate of 10 degrees C/minute, maintaining at constant temperature for 1-4 hours, and naturally cooling to room temperature.