▎ 摘　　要

NOVELTY - The method involves putting oxidation graphite in a beaker. The oxidation graphite is added to deionized water, stirred uniformly and ultrasonically dispersed to obtain graphene dispersion liquid. The oxidation graphene dispersion liquid is stirred and extruded. A sponge is taken in a surface vessel under room temperature at 40-120 degree Celsius and dried to obtain dense ammine sponge. An oxidation graphene composite structure is sintered and naturally cooled to obtain carbon nitrogen sponge graphene composite material. USE - Capacitor electrode carbon nitrogen composite sponge material preparation method. ADVANTAGE - The method enables performing simple and easy operation and short process, reducing cost, and providing easy industrialization. DESCRIPTION OF DRAWING(S) - The drawing shows a schematic view of a capacitor electrode carbon nitrogen composite sponge material.