▎ 摘　　要

NOVELTY - Preparing graphene composite electrode material comprises e.g. mixing the graphene with polyethylene glycol and ultrasonically dispersing in the solvent, forming conductive graphene dispersion, then adding the titanium source in the conductive graphene dispersion to form first mixed solution, dissolving the lithium salt in a solvent to form second mixed solution, slowly dropping the second solution to obtain third mixed solution, into the first mixed solution, stirring, drying, performing heat treatment, and sintering in the protective atmosphere to obtain composite material. USE - The method is useful for preparing graphene composite electrode material (claimed). ADVANTAGE - The composite electrode material has improved electronic conductivity and ionic conductivity of the lithium titanate composite material, and has a good rate performance. DETAILED DESCRIPTION - Preparing graphene composite electrode material comprises mixing the graphene with polyethylene glycol and ultrasonically dispersing in the solvent, forming conductive graphene dispersion, then adding the titanium source in the conductive graphene dispersion to form first mixed solution, dissolving the lithium salt in a solvent to form second mixed solution, slowly dropping the second solution to obtain third mixed solution, into the first mixed solution, stirring, drying, performing heat treatment, and sintering to obtain nano-lithium titanate-graphene composite material in the protective atmosphere; the process specifically comprises (1) placing the powder-shaped graphite and polyethylene glycol mixed ratio is 1:1-2 by weight, preferably the ratio of 1:1, adding 20-100 times of solvent of polyethylene glycol quality, ultrasonically dispersing for 0.5-5 hours, preferably 2 hours, forming conductive graphene dispersion liquid; (2) according to the mass ratio of lithium titanate: graphene of 80-99:1-20, weighing titanium source and added to the resulting conductive graphene dispersion, high speed stirring for 0.5-5 hours, preferably 1 hour to form first mixed solution; (3) according to mol ratio of titanium is 4-4.8:5, preferably 4.4:5, dissolving the lithium salt in the solvent, the mass of the solvent is 10-30 times of the mass of lithium salt to form second solution; (4) slowly dripping the first mixed solution, and the second solution obtained in step (2), and step (3), stirring at high speed for 1-12 hours, preferably 3 hours, to obtain third mixed solution, (5) using the resulting third mixed solution, placing in the drying box at 50-100 degrees C for 2-12 hours to obtain the lithium titanate-graphene composite material precursor, (6) using the resulting precursor, placing in the atmosphere furnace, under the protection of inert gas without oxygen for sintering, the heating speed is 1-20 degrees C/minute, preferably 10 degrees C/minute; then sintering at temperature of 700-900 degrees C, preferably 800 degrees C; the sintering time is 8-24 hours, preferably 12 hours to obtain the nano lithium titanate-graphene composite material.