Self-supporting CoO/Graphene Hybrid Films as Binder-free Anode Materials for Lithium Ion Batteries.

A self-supporting CoO/graphene hybrid film has been constructed via vacuum filtration of Co(OH) nanosheet and graphene, followed by a two-step thermal treatment. Within the hybrid film, CoO nanoparticles with size of 40~60 nm uniformly in-situ grew on the surface of graphene, forming a novel porous and interleaved structure with strong interactions between CoO nanoparticles and graphene. Such fascinating microstructures can greatly facilitate interfacial electron transportation and accommodate the volume changes upon Li ions insertion and extraction. Consequently, the binder-less hybrid film demonstrated extremely high reversible capacity (1287.7 mAh g at 0.2 A g), excellent cycling stability and rate capability (1110 and 800 mAh g at 0.5 and 1.0 A g, respectively).