▎ 摘　　要

NOVELTY - Preparing composite electrode material comprises preparing a biomass solution, and freeze-drying the biomass solution to obtain a biomass aerogel, immersing the biomass aerogel in the graphene oxide solution, adding nitrate to obtain precursor mixed solution, heating and drying the precursor mixture to a solid state, continuously heating until an explosive reaction occurs to obtain composite electrode material. USE - The method is useful for preparing composite electrode material is used in lithium-ion capacitor cathode (claimed), super capacitors or lithium primary batteries. ADVANTAGE - The composite electrode material has characteristics of high coulomb efficiency, high capacity and excellent cycle stability. The first coulomb efficiency of the composite electrode material of the application is as high as 90%, and the specific capacity is 1070 mAh/g, and can be used in negative electrode materials of lithium ion capacitors, super capacitors or lithium primary batteries. DETAILED DESCRIPTION - INDEPENDENT CLAIMS are included for: A composite electrode material prepared by the above-mentioned method; lithium ion capacitor cathode.