▎ 摘　　要

NOVELTY - A graphene-titanium dioxide nanofiber composite material preparation method involves mixing graphene-titanium oxide powder, surfactant, sodium hydroxide and water uniformly to obtain white solution, ultrasonically dispersing the mixture, and subjecting the mixture to hydrothermal reaction. The product is collected and dried. The intermediate is centrifuged, washed with deionized water, diluted with hydrochloric acid solution and stirred. The mixture is centrifuged, washed with deionized water, dried, followed by heat-processing in presence of inert gas. USE - Method for preparation of graphene-titanium dioxide nanofiber composite material for use in lithium ion battery. ADVANTAGE - The method enables preparing graphene-titanium dioxide nanofiber composite material at high yield in a simple, environment-friendly and cost-effective manner. The lithium ion battery containing the graphene-titanium dioxide nanofiber composite material has specific capacity of 128 mAh/g, 104 mAh/g and 85 mAh/g at 5C, 10C and 20C. DETAILED DESCRIPTION - A graphene-titanium dioxide nanofiber composite material preparation method involves mixing 100-600 mg graphene-titanium oxide powder, 0-0.4 g surfactant, 8-16 g sodium hydroxide and 30 ml water uniformly to obtain white solution, where the solution comprises 1-15 ml titanium dioxide and 1-10 mg graphene, ultrasonically dispersing the mixture, and subjecting the mixture to hydrothermal reaction at 120-200 degrees C for 12-72 hours. The product is collected and dried to obtain graphene oxide-sodium titanate intermediate. The intermediate is centrifuged, washed with deionized water, diluted with hydrochloric acid solution and stirred for 8-24 hours. The mixture is centrifuged, washed repeatedly with deionized water, dried, followed by heat-processing in presence of inert gas at 350-600 degrees C for 3-7 hours.