▎ 摘　　要

NOVELTY - Nitrogen-sulfur co-doped graphene composite silicon-boron carbon-nitrogen ceramic composite material is claimed. The ceramic composite material is prepared by mixing nitrogen-sulfur co-doped graphene and silicon-boron carbon-nitrogen into ceramic powder in a mass ratio of 1:10, then pyrolyzing mixture at high temperature of 600-1000 degrees C, and treating bond by a ball milling method. USE - The composite material is useful as cathode material in lithium ion battery (claimed). ADVANTAGE - The composite material: has stable performance, excellent cycle performance, Coulomb efficiency and capacity retention rate as high as 99%. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is also included for preparing nitrogen-sulfur co-doped graphene composite silicon-boron carbon-nitrogen ceramic composite material comprising (i) adding boron trichloride into reaction vessel, cooling to -80 to -75 degrees C, then adding methyldichlorosilane, diphenyldichlorosilane and hexamethyldisilazane, stirring under argon flow, heating at room temperature, stirring, reacting at 60-70 degrees C for 1-2 hours, then reacting at 90-110 degrees C for 2-3 hours, then heating and reacting at 240-260 degrees C for 3-4 hours, and removing solvent by vacuum drying to obtain silicon-boron-carbon-nitrogen, where molar ratio between boron trichloride, methyldichlorosilane, diphenyldichlorosilane and hexamethyldisilazane is 1:1:1:4.9, (ii) adding 2,5-dimercapto-1,3,4-thiadiazole solution into graphene oxide solution, then adding hexadecyl trimethyl ammonium bromide, stirring, then adding ammonium persulfate-methanol-aqueous solution, stirring and reacting at room temperature for 20-28 hours, filtering, washing, and drying to obtain nitrogen-sulfur double-doped graphene, where mass ratio between 2,5-dimercapto-1,3,4-thiadiazole, graphene oxide solution, hexadecyl trimethyl ammonium bromide and ammonium persulfate is 0.3:10:0.1:1.37, and (iii) mixing silicon-boron-carbon-nitrogen obtained in step (i) and nitrogen-sulfur co-doped graphene obtained in step (ii), crosslinking at 180-220 degrees C for 1.5-3 hours, heating at 600-1000 degrees C for 1-3 hours under argon flow, and cooling to room temperature to obtain product as P1 and P2, then mixing P1 and P2, ball milling and sieving into 100 mu m to obtain ceramic composite material P3, where mass ratio between P1 and P2 is 10:1.