▎ 摘　　要

NOVELTY - A composite electrode material is prepared by high temperature carbonization after filling the pores of natural wood with graphene oxide. The electrode material has a penetrating macroporous structure formed by carbonization of wood perpendicular to the plane of the electrode and a pinhole structure constructed of graphene. USE - Composite electrode material for supercapacitor (claimed). ADVANTAGE - The composite electrode material can be used independently without adding a binder or a conductive agent. The electrode material has controllable thickness, and effectively reduces the applied non-active material in the process of supercapacitor assembly, thus providing a supercapacitor having high area ratio capacitance and long cycle life. DETAILED DESCRIPTION - INDEPENDENT CLAIMS are included for the following: (1) preparation of the composite electrode material, which involves adding reducing agent to graphene oxide solution, immersing wood in the prepared solution, heating the wood filled with the graphene oxide, freezing and drying, and carbonizing the obtained material; and (2) supercapacitor.