Graphene-wrapped Fe2O3 nanorings for Li ion battery anodes

Graphene-wrapped Fe2O3 nanorings (RGO/Fe2O3) were synthesized by a facile approach, which assembled with graphene and the Fe2O3 nanorings precursor through the colloidal coagulation effect at room temperature. The uniform Fe2O3 nanorings prepared by hydrothermal routes were homogeneously distributed and well wrapped by graphene. When tested as anode for lithium ion batteries, RGO/Fe2O3 exhibits a high capacity and good cycling stability. This could be attributed to the interaction of ring-shaped structure and graphene sheets, which inherit the good kinetic property of Fe2O3 nanorings and enhance the structural integrity with graphene sheets' support.