▎ 摘　　要

NOVELTY - The preparation method of borohydride-doped multilayer graphene nanosheet involves weighing alkali metal halide, borohydride and carbon material and respectively processing, mixing alkali metal halide with borohydride and 5-20 %mass carbon material, where the molar ratio of alkali metal halide and borohydride is 1:1, mechanically ball milling the mixture, chemically reacting alkali metal halide with borohydride to form alkali metal borohydride and inserting carbon material in the interlayer. USE - The method is useful for preparing borohydride-doped multilayer graphene nanosheet, which is useful for solar battery, aerospace materials, optoelectronic device, field emission material, energy storage material and other new energy materials. ADVANTAGE - The method enables simple and economical preparation of borohydride-doped multilayer graphene nanosheet with high capacitance and excellent electrochemical performance. DETAILED DESCRIPTION - The preparation method of borohydride-doped multilayer graphene nanosheet involves weighing alkali metal halide of formula: MX, borohydride and carbon material and respectively processing, mixing alkali metal halide with borohydride and 5-20 %mass carbon material, where the molar ratio of alkali metal halide and borohydride is 1:1, mechanically ball milling the mixture, chemically reacting alkali metal halide with borohydride to form alkali metal borohydride and inserting carbon material in the interlayer. M= Li, Na, K or Ru;and X= F, Cl, Br or I.