Metal Oxide Wrapped by Reduced Graphene Oxide Nanocomposites as Anode Materials for Lithium-Ion Batteries.

The reduced graphene oxide/iron oxide (rGO/FeO) and reduced graphene oxide/cobalt oxide (rGO/CoO composite anodes have been successfully prepared through a simple and scalable ball-milling synthesis. The substantial interaction of FeO and CoO with the rGO matrix strengthens the electronic conductivity and limits the volume variation during cycling in the rGO/FeO and rGO/CoO composites because reduced graphene oxide (rGO) helps the metal oxides (MOs) to attain a more efficient diffusion of Li-ions and leads to high specific capacities. As anode materials for LIBs, the rGO/FeO and rGO/CoO composites demonstrate overall superb electrochemical properties, especially rGO/FeOT-5 and rGO/CoOT-5, showcasing higher reversible capacities of 1021 and 773 mAhg after 100 cycles at 100 mAg, accompanied by the significant rate performance. Because of their superior electrochemical efficiency, high capacity and low cost, the rGO/FeO and rGO/CoO composites made by ball milling could be outstanding anode materials for LIBs. Due to the excellent electrochemical performance, the rGO/FeO and rGO/CoO composites prepared via ball milling could be promising anode materials with a high capacity and low cost for LIBs. The findings may provide shed some light on how other metal oxides wrapped by rGO can be prepared for future applications.