▎ 摘　　要

NOVELTY - The preparation of oxidized graphene quantum dot based composite electrode material involves taking water or organic solvent dispersion containing composite nanomaterial including graphene oxide quantum dots and graphene, adding positive electrode and/or negative electrode active material of lithium ion battery or supercapacitor, ultrasonically treating, mechanically agitating, ball milling, dispersing into emulsion, separating emulsion to obtain slurry, drying slurry, and pulverizing by grinding to obtain oxidized graphene quantum dots based graphene composite electrode material. USE - Preparation method of oxidized graphene quantum dot based composite electrode material used as positive electrode and negative electrode active material of lithium ion battery and supercapacitor. ADVANTAGE - The method enables preparation of oxidized graphene quantum dot based composite electrode material with excellent electrical conductivity, heat conductivity, high dispersibility of aqueous or organic ions, and high storage capacity. DETAILED DESCRIPTION - The preparation of oxidized graphene quantum dot based composite electrode material involves taking water or organic solvent dispersion containing composite nanomaterial composed of graphene oxide quantum dots and graphene, adding positive electrode and/or negative electrode active material of lithium ion battery or supercapacitor, ultrasonically treating, mechanically agitating, ball milling, dispersing into emulsion, separating emulsion to obtain slurry, drying slurry, pulverizing by grinding to obtain oxidized graphene quantum dots based graphene composite electrode material, where composite electrode material is powdered oxidized graphene quantum dots based graphene composite nanomaterial used as lithium ion battery or supercapacitor positive electrode and/or negative electrode active material.