▎ 摘　　要

NOVELTY - The preparation of composite material involves mixing titanium-containing compound, surfactant and organic solvent, dispersing to obtain titanium source dispersion, mixing lithium-containing compound, water and organic solvent, dispersing to obtain lithium source solution, heating dispersion, dripping lithium source solution, reacting, and cooling to obtain lithium titanate precursor, calcining to obtain electrode material, mixing with graphene and solvent, dispersing to obtain graphene/lithium titanate electrode material, and mixing with acetylene black and polyvinylidene fluoride. USE - Preparation of high-performance graphene/lithium titanate composite material for lithium ion battery. ADVANTAGE - The method enables the preparation of high-performance graphene/lithium titanate composite material having capacity of 130 mAh/g at 2C rate, capacity of more than 99% even after 1000 cycles, and excellent charge-discharge performance. DETAILED DESCRIPTION - The preparation method of high-performance graphene/lithium titanate composite material involves mixing certain amount of titanium-containing compound, surfactant and organic solvent, ultrasonically dispersing to obtain mixed titanium source dispersion, mixing certain amount of a lithium-containing compound, deionized water and an organic solvent, ultrasonically dispersing to obtain lithium source solution, micro-wave heating and refluxing mixed titanium source dispersion, slowly dripping lithium source solution, reacting for certain time, cooling, removing solvent, and drying to obtain lithium titanate precursor, calcining in air atmosphere at certain temperature for certain time to obtain a lithium titanate electrode material, mixing electrode material and graphene with organic solvent, ultrasonically dispersing, removing solvent to obtain graphene/lithium titanate electrode material, mixing graphene/lithium titanate electrode material, acetylene black and polyvinylidene fluoride, and coating on aluminum foil to obtain button battery electrode sheet, assembling in glove box and testing battery charge and discharge performance.