▎ 摘　　要

NOVELTY - A micro-nano scale graphene/lithium titanate composite cathode material is prepared by uniformly dispersing graphene oxide into isopropanol solution, adding into ingredient A pot, stirring, adding lithium acetate solution, fully dissolving, adding glacial acetic acid and deionized water, stirring to obtain solution A, adding graphene oxide isopropanol solution into ingredient B pot, and stirring; and adding titanium complex, stirring for 10-20 minutes to obtain solution B, transferring solution A into reaction pot, heating, adding solution B, vacuum dewatering, drying, and crushing. USE - Method for preparing micro-nano scale graphene/lithium titanate composite cathode material (claimed). ADVANTAGE - The material has negative electrode material distribution of 200 nm to 5 mu m, small lithium ion diffusion distance, good electrochemical performance, 1C content of more than 170 mAh/g and 10C content of larger than 120 mAh/g. DETAILED DESCRIPTION - A micro-nano scale graphene/lithium titanate composite cathode material is prepared by: (A) uniformly dispersing graphene oxide into isopropanol solution to get graphene oxide isopropanol solution, adding into ingredient A pot, stirring, adding lithium acetate solution, fully dissolving, adding glacial acetic acid and deionized water, stirring to obtain solution A, adding graphene oxide isopropanol solution into ingredient B pot, and stirring; (B) adding titanium complex, stirring for 10-20 minutes to obtain solution B, transferring solution A into reaction pot, heating at 55 degrees C, stirring, dropwise adding solution B, controlling at 60-75 degrees C for 3-4 hours to obtain mixed solution, vacuum dewatering at 70-75 degrees C to obtain gel product, drying, and crushing to obtain graphene oxide/lithium titanate compound precursor; and (C) placing into high temperature reduction furnace, introducing nitrogen to remove air, heating at 1000-1200 degrees C, low temperature sintering for 8-12 hours, keeping for 5-30 minutes, reducing, cooling to room temperature under nitrogen atmosphere. The ratio of deionized water:titanium complex:graphene oxide:glacial acetic acid:lithium acetate is 30-36:6-7.3:15-18:2-2.4:1-1.3. The graphene oxide is single layer graphene oxide.