▎ 摘　　要

NOVELTY - The preparation method of lithium titanate composite electrode material involves (i) mixing powdered graphene with polyethylene glycol, adding 20-50 times polyethylene glycol solvent, ultrasonically dispersing in a solvent for 0.5-5 hours, specifically 2 hours to obtain a conductive graphene dispersion, (ii) mixing lithium titanate material and conductive graphene dispersion, ball milling in a planetary ball mill, (iii) drying the milled material, placing in an atmosphere furnace, sintering in an anaerobic inert gas, and grinding. USE - Preparation of lithium titanate composite electrode material used as cathode material for power lithium-ion battery and hybrid supercapacitor. ADVANTAGE - The method enables the preparation of lithium titanate composite electrode material with high electronic conductivity, and excellent rate performance. DETAILED DESCRIPTION - The preparation method of lithium titanate composite electrode material involves (i) mixing powdered graphene with polyethylene glycol in a ratio of 1:0.8-2, specifically 1:1, adding 20-50 times polyethylene glycol solvent, ultrasonically dispersing in a solvent for 0.5-5 hours, specifically 2 hours to obtain a conductive graphene dispersion, (ii) mixing lithium titanate material and conductive graphene dispersion in a ratio of 1:1-5, ball milling in a planetary ball mill for 2-10 hours, specifically 4 hours, (iii) drying the milled material, placing in an atmosphere furnace, sintering in an anaerobic inert gas at 500-800 degrees C, specifically 650 degrees C for 1-5 hours, specifically 2 hours, and grinding.