▎ 摘　　要

Graphene/CdS quantum dot composites were prepared via in situ synthesis and its electrochemical performances as anode material for lithium-ion batteries were investigated. Ac impendence spectra reveal that electrolytes form a fine solid electrolyte interphase film (SEI) on the surface of the graphene/CdS quantum dot composites. The initial discharge capacity of the lithium-ion battery using graphene/CdS quantum dot as anode is about to 1264.7mAh/g and reversible capacity is 888.9mAh/g after 20 cycles. The results indicate that the CdS quantum dot improve the stability of the graphene structure and the conductivity between graphene sheets, so the electrochemical performance of graphene/CdS quantum dot composites as anode materials is obviously better than that of graphene materials.