Controllable preparation of wrapped Fe₂O₃@rGO composites and their lithium ion storage performance

In this paper, reduced graphene oxides wrapped hollow Fe₂O₃ spheres (Fe₂O₃@rGO) were successfully prepared by solvothermal method. Results show that plenty of Fe−O−C bonds between reduced graphene oxides and Fe₂O₃ significantly improved electron transfer rate of the composite anodes, and confinement effect of reduced graphene oxides slowed the pulverization rate of Fe₂O₃ during charge/discharge process. As expected, wrapped structured Fe₂O₃@rGO anode exhibited high rate capability of 514 mA·h/g at high current of 5.0 A/g and durable cycling life over 500 cycles with a capacity of 987 mA·h/g under 0.5 A/g with a capacity retention of 81.1%. This work provides an effective strategy for the preparation of high-rate and long-life graphene composite anode materials.