▎ 摘　　要

NOVELTY - Preparation of graphene/carbon-coated doped lithium sulfide composite involves mixing lithium sulfide with metal oxide powder, milling the obtained mixture to obtain doped nanosized lithium sulfide, dispersing the nanosized lithium sulfide in an ethanol solution obtained by dissolving a carbon source into ethanol, dripping the ethanol solution into the suspension to obtain a carbon-coated lithium sulfide, and adding the carbon-coated lithium sulfide and graphene to tetrahydrofuran and performing ultrasonic reaction to obtain graphene/carbon-coated doped lithium sulfide composite. USE - Preparation of graphene/carbon-coated doped lithium sulfide composite (claimed). ADVANTAGE - The method enables preparation of graphene/carbon-coated doped lithium sulfide composite having excellent electrochemical performance. Doped metal ions can change crystal structure of lithium sulfide, which is beneficial to improve conductivity of the lithium sulfide composite. DETAILED DESCRIPTION - Preparation of graphene/carbon-coated doped lithium sulfide composite involves mixing lithium sulfide with metal oxide powder in an inert gas-protected glove box, charging the obtained mixture into a sealed ball mill, milling the mixture to obtain doped nanosized lithium sulfide, adding and dissolving a carbon source into ethanol under stirring to obtain an ethanol solution containing the carbon source, dispersing the nanosized lithium sulfide in the ethanol solution, dripping the ethanol solution into the suspension, stirring the mixture at room temperature, evaporating the solvent, charging the mixture into a muffle furnace protected by an inert gas for reacting and obtaining a carbon-coated lithium sulfide, and adding the carbon-coated lithium sulfide and graphene to tetrahydrofuran and performing ultrasonic reaction to obtain graphene/carbon-coated doped lithium sulfide composite comprising a core-shell structure.