▎ 摘　　要

NOVELTY - Acrylonitrile oligomer is mixed with solvent to prepare acrylonitrile oligomer solution. The acrylonitrile oligomer solution and lithium titanate precursor powder are mixed, stirred and the solvent is evaporated to obtain precursor powder. The precursor powder is heated at more than 700 degrees C for 20 hours to obtain graphene-doped and lithium titanate-coated composite cathode material. USE - Preparation of graphene-doped and lithium titanate-coated composite cathode material used for lithium ion battery. ADVANTAGE - The method economically provides composite cathode material having high specific capacity (174.7 mAh/g), and charging and discharging characteristics with cycle efficiency of 97.7%, at high yield by simple process.