▎ 摘　　要

NOVELTY - A double helix carbon fiber-graphene composite material comprises double helix carbon fiber and graphene. The amount of double helix carbon fiber is 1-99% of the total mass of composite material. The double helix carbon fiber has fiber diameter of 0.1-1 mu m, helix diameter of 5-10 mu m, and spiral length of 10-100 mu m. The graphene is monolithic or multi-sheet stacked graphene having diameter of 1-200 mu m, and thickness of 1-50 nm. USE - Double helix carbon fiber-graphene composite material used as supercapacitor electrode material, electromagnetic wave absorption/shielding material, and hydrogen storage material. ADVANTAGE - The double helix carbon fiber-graphene composite material is porous in nature, and has large surface and high conductivity. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is included for preparation of double helix carbon fiber-graphene composite material, which involves (i) obtaining graphene, (ii) adding graphene to an organic solvent, ultrasonically dispersing for 0.5-2 hours to obtain a graphene suspension, where the organic solvent is N-methylpyrrolidone, N,N-dimethylformamide, ethanol, chloroform, or tetrahydrofuran, (iii) adding double helix carbon fiber to graphene suspension, mixing double helix carbon fiber with graphene, magnetically stirring, and removing solvent.