FeO/Graphene Composite Anode Material for Fast-Charging Li-Ion Batteries.

Composite anode material based on FeO and reduced graphene oxide is prepared by base-catalysed co-precipitation and sonochemical dispersion. Structural and morphological characterizations demonstrate an effective and homogeneous embedding of FeO nanoparticles in the carbonaceous matrix. Electrochemical characterization highlights specific capacities higher than 1000 mAh g at 1C, while a capacity of 980 mAhg is retained at 4C, with outstanding cycling stability. These results demonstrate a synergistic effect by nanosize morphology of FeO and inter-particle conductivity of graphene nanosheets, which also contribute to enhancing the mechanical and cycling stability of the electrode. The outstanding capacity delivered at high rates suggests a possible application of the anode material for high-power systems.