▎ 摘　　要

Graphene-wrapped Cr2O3 hollow nanospheres were prepared using a facile two-step process by solvothermal to synthesize Cr2O3 hollow nanospheres and then hydrothermal reduction of the GO with urea to yield graphene coating on Cr2O3 hollow nanospheres. The graphene/Cr2O3 composites exhibit not only a high reversible capacity of over 700 mAhg(-1) for the first cycle, but also an outstanding cycling stability and rate capability. Various characterization methods indicate that the Cr2O3 hollow nanospheres are uniformly distributed on the surface and interlayer of graphene sheets. The positive synergistic effect of the Cr2O3 hollow nanospheres and graphene coating may be beneficial to improve electrochemical performances of these composite electrodes.