▎ 摘　　要

FeS2 quantum-dots/functionalized graphene-sheet (QDs/FGS) composites are prepared by a facile and scalable method. The FeS2 QDs/FGS composites can be used as anode materials for sodium-ion batteries. The FeS2 QDs/FGS composites can achieve large specific discharge and charge capacities of 742 and 683 mAh center dot g(-1) (based on the total mass of the FeS2 QDs/FGS composites) at the current density of 0.5 A center dot g(-1) in the first cycle, respectively, and retain a reversible charge capacity of 552 mAh center dot g(-1) after 100 cycles. The FeS2 QDs/FGS composites can display high specific capacities of 452 and 315 mAh center dot g(-1) at the high current densities of 2 and 5 A center dot g(-1). These results indicate that the FeS2 QDs/FGS composites have good cycle performance and high rate capability, making them promising candidates as anode material for sodium-ion batteries.