▎ 摘　　要

NOVELTY - A graphene/oxygen vacancy lithium titanate composite material preparing method involves adding titanium oxide to deionized water into a suspension of titanium dioxide under stirring state, and milling the mixture in a ball mill to obtain a nano-sized anatase titanium dioxide. Lithium hydroxide is dissolved in deionized water. The resulting solution is added to the anatase titanium dioxide, and graphene oxide dispersion in deionized water is added, stirred and spray-dried to obtain a precursor powder. The precursor powder is put in a vacuum and calcined to obtain the finished product. USE - Method for preparing a graphene/oxygen vacancy lithium titanate composite material. ADVANTAGE - The method enables preparing the graphene/lithium titanate composite material in a simple and easy manner with uniform size and unified morphology, promoting the generation of oxygen vacancies in the high-temperature calcination process, and effectively improving conductivity, stability, and charging and discharging performance of the lithium titanate composite material. DETAILED DESCRIPTION - A graphene/oxygen vacancy lithium titanate composite material preparing method involves adding 150 mass parts titanium oxide to 500 mass parts deionized water into a suspension of titanium dioxide under stirring state, and milling the mixture in a ball mill to obtain a nano-sized anatase titanium dioxide having size of 100-350 nm. 63-69 mass parts lithium hydroxide is dissolved in 400-600 mass parts deionized water to obtain an aqueous solution of lithium hydroxide. The resulting solution is added to the anatase titanium dioxide, and 0.05-18 mass parts graphene oxide dispersion in 100-300 mass parts deionized water is added. The resulting solution is stirred to obtain a slurry. The slurry is spray-dried to obtain a precursor powder. The precursor powder is put in a vacuum at a temperature of 750-950 degrees C and calcined to obtain the finished product, where the lithium titanate particles have size of 110-190 nm.