Electrochemical Properties of Graphene/CdS Quantum Dot Composites

Graphene/CdS quantum dot composites were prepared via in situ synthesis and its electrochemical per-formances as anode material for lithium-ion batteries were investigated.Ac impendence spectra reveal that electro-lytes 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.