▎ 摘　　要

NOVELTY - The material contains a porous net-shaped structure provided with manganese dioxide and graphite, where width of a sheet is 3 mm. USE - Graphene/manganese dioxide nanometer composite material for a super capacitor. ADVANTAGE - The material is provided with a simple porous network obtained composite material. The material ensures small grain size and uniform distribution of content of manganese dioxide and reduces preparing cost. The device is provided with a surface porous net structure to make larger proton diffusion coefficient. The material allows entry of active substance, so that the material has better electrochemical performance and conducting performance. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is also included for a graphene/manganese dioxide nanometer composite material preparation method. DESCRIPTION OF DRAWING(S) - The drawing shows a photographic view of a graphene/manganese dioxide nanometer composite material.