▎ 摘　　要

NOVELTY - Preparing lithium titanate-graphene composite material comprises e.g. (1) adding potassium chloride to deionized water, stirring for 30-40 minutes to obtain solution A; then, adding solution A to absolute ethanol, stirring for 10-30 minutes, and adding butyl titanate in dropwise manner under stirring condition, aging; (2) centrifuging the dispersion B with absolute ethanol and deionized water for many times to obtain a white precipitated product, drying in a vacuum; (3) ultrasonically dispersing the graphene oxide powder in deionized water; and (4) dispersing the titanium dioxide microspheres in the graphene oxide dispersion, stirring, adding lithium hydroxide to mixed dispersion, stirring, transferring it into reaction kettle with polytetrafluoroethylene lining to react; naturally cooling to room temperature to obtain grey precipitate, product eluting with de-ionized water, absolute ethanol, centrifugal washing and vacuum drying to obtain solid matter, and calcining the solid matter. USE - The method is useful for preparing lithium titanate-graphene composite material. ADVANTAGE - The method: successfully synthesizes composite material in situ by a simple hydrothermal method as a cathode material for high performance lithium batteries, due to the uniform high conductivity graphene oxide coating, a three-dimensional conductive network can be formed between the lithium titanate mesoporous microspheres, facilitates the transport of electrons and lithium ions, and improves the rate performance and cycle stability. DETAILED DESCRIPTION - Preparing lithium titanate-graphene composite material comprises (1) adding potassium chloride to deionized water, stirring for 30-40 minutes to obtain solution A; then, adding solution A to absolute ethanol, stirring for 10-30 minutes, and then adding butyl titanate in dropwise manner under stirring condition, aging for 2-4 hours to obtain a dispersion B; (2) centrifuging the dispersion B obtained in the step (1) with absolute ethanol and deionized water for many times to obtain a white precipitated product, drying in a vacuum to obtain a titanium dioxide microsphere; (3) ultrasonically dispersing the graphene oxide powder in deionized water to obtain a graphene oxide dispersion; and (4) dispersing the titanium dioxide microspheres obtained in the step (2) in the graphene oxide dispersion, stirring for 10-12 hours, then adding lithium hydroxide to the mixed dispersion, stirring for 30-40 minutes, transferring it into the reaction kettle with polytetrafluoroethylene lining to react; after finishing reaction, naturally cooling to room temperature to obtain grey precipitate, then the product eluting with de-ionized water, absolute ethanol, centrifugal washing and vacuum drying to obtain solid matter, at last, calcining the solid matter in a tubular furnace, under the protection of argon atmosphere, and obtaining the lithium ion battery lithium titanate/graphene composite material.