▎ 摘　　要

NOVELTY - Preparation of cathode material involves adding lithium carbonate and tricobalt tetroxide to deionized water with molar ratio of lithium to cobalt of 1-1.2:1, and uniformly grinding to obtain precursor slurry material, spray drying positive electrode material precursor slurry to obtain positive electrode material precursor, pre-heating precursor in air atmosphere, calcining to obtain lithium cobaltate cathode material, mixing lithium cobaltate cathode material and liquid polyacrylonitrile oligomer, stirring in deionized water, followed by spray drying to obtain graphene-doped lithium cobaltate cathode material precursor, pre-oxidizing graphene-doped lithium cobaltate cathode material precursor in an air atmosphere, and carrying out high-temperature calcination treatment. USE - Preparation of cathode material (claimed). ADVANTAGE - The method provides cathode material in which doping of graphene effectively controls growth of crystal grains, internal crystal grains of material are arranged in order with dense packing and structural stability of electrode material is maintained. The excellent electrical conductivity of graphene accelerates electron migration rate of composite material and effectively improves electrical conductivity of electrode material. The liquid acrylonitrile oligomer forms graphene structure during sintering, and stabilizes structure of lithium cobaltate cathode material during charge and discharge, so that material has excellent cycle stability under large-rate charge and discharge conditions.