▎ 摘　　要

NOVELTY - Preparing graphene-based composite cathode material comprises (i) mixing and stirring carboxymethyl cellulose (CMC) and hydroxypropyl cellulose (HPC) solution, and graphite powder into deionized water to obtain graphite dispersion, (ii) adding alkaline silica sol into graphite dispersion to obtain graphite/alkaline silica sol dispersion, drying under an inert atmosphere, heating and keeping warm, cooling to room temperature to obtain graphite/silicon dioxide composite, and (iii) mixing graphite/silicon dioxide composite with magnesium powder equivalent with sodium chloride, heat treating, keeping warm, cooling, washing and centrifuging, washing with deionized water, and centrifuging to remove water to obtain graphite/silicon composite. USE - The method is useful for preparing graphene-based composite cathode material useful in lithium-ion battery (claimed). ADVANTAGE - The method provides graphene-based lithium-ion battery composite cathode material aims at deficiencies of prior art.