▎ 摘　　要

NOVELTY - Silicon-carbon cathode material, is claimed. The cathode material is core shell structure, the core is nano silicon, porous graphite and graphene oxide. The nano silicon is prepared by ionization decomposition. The porous graphite is prepared by combustion method. The nano silicon and graphene oxide penetrates into the pores of graphite by ultrasonic vibration method. The shell is organic cracked carbon coating. The porous graphite is natural graphite and/or synthetic graphite. The porosity of the porous graphite is 40-80%. The median particle diameter of the nano silicon is 10-100 nm. The thickness of the organic cracked carbon coating layer is 0.1-1 mu m. USE - The silicon-carbon cathode material is useful for lithium-ion battery (claimed). ADVANTAGE - The silicon-carbon cathode material has excellent electrochemical performance. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is also included for preparing silicon-carbon cathode material, comprising (i) adding organosilicone source gas into a plasma generator under protection of inert gas and ionizing to decompose to obtain nano silicon powder, (ii) adding nano silicon powder obtained in step (i) into graphene oxide suspension, stirring uniformly, introducing into a sand mill and dispersing at high speed to obtain nano silicon and graphene oxide composite slurry, (iii) adding graphite into a reaction furnace, introducing nitrogen-oxygen mixed gas, heating to a suitable temperature and calcining to obtain porous graphite, (iv) adding porous graphite obtained in step (iii) into composite slurry obtained in step (ii), ultrasonically oscillating to make nano silicon and graphene oxide permeated on the graphite pores and drying to obtain cathode material precursor, and (v) homogeneously combining cathode material precursor obtained in step (iv) with organic cracked carbon source and sintering to obtain final product as core shell structured.