▎ 摘　　要

NOVELTY - The synthesis method of composite material involves weighing ionic liquid and ferric chloride hexahydrate in a ratio of 1:1 and then stirring, adding water and then heating, drying the mixture to obtain metal-containing ionic liquid, adding graphene oxide-ethanol dispersion solution and then stirring, adding sulfur source and then washing using water and ethanol, drying the mixture and then performing heat treatment and pyrolyzing. USE - The method is useful for synthesis of composite material, which is useful as cathode material for lithium-ion battery and secondary battery (all claimed). ADVANTAGE - The method enables synthesis of composite material in simple manner.