▎ 摘　　要

NOVELTY - Preparing composite cathode material involves taking graphene oxide solution and nano-silicon, dissolving in methanol, adding methyl methacrylate and azo-bis-isobutyrynitrile with stirring under atmosphere of nitrogen to obtain primary product of graphene oxide/silicon/poly(methyl methacrylate) (GO/Si/PMMA), taking pyrrole and dissolving in methanol to form pyrrole solution, mixing obtained primary product and adding pyrrole solution into it and placing in ice water bath and stirring. USE - Method for preparing composite cathode material for lithium ion battery. DETAILED DESCRIPTION - Preparing for lithium ion battery composite cathode material, involves taking graphene oxide solution and nano-silicon, dissolving in methanol, adding methyl methacrylate and azo-bis-isobutyrynitrile with stirring under atmosphere of nitrogen to obtain primary product of graphene oxide/silicon/poly(methyl methacrylate) (GO/Si/PMMA), taking pyrrole and dissolving in methanol to form pyrrole solution, mixing obtained primary product and adding pyrrole solution into it and placing in ice water bath and stirring, adding oxidizing agent, centrifuging and vacuum drying to obtain composite product of polypyrrole/graphene silicon and poly(methyl methacrylate) (PPy/G/Si/PMMA), introducing obtained product under atmosphere of nitrogen to obtain final composite cathode material.