Facile fabrication of Fe 3O 4 octahedra with bimodal conductive network of nanoporous Cu and graphene nanosheets for high-performance anode in Li-ion batteries

摘要

AbstractFe3O4/Cu@graphene (Fe3O4/Cu@G) nanocomposite is prepared through a facile fabrication of Fe3O4/Cu precursor by dealloying FeCuAl alloy followed by the reduction of coassembled aggregates of Fe3O4/Cu and graphene oxide. The obtained Fe3O4octahedra are well enwrapped in nanoporous Cu network and graphene nanosheets. Benefitting from the bimodal conductive network of Cu and graphene, the Fe3O4/Cu@G composite exhibits much higher specific capacity and dramatically enhanced cycling stability compared with the pure Fe3O4octahedra, Fe3O4/Cu, and Fe3O4@G composite. Moreover, the Fe3O4/Cu@G electrode shows satisfactory cycling reversibility even at a current rate up to 2000?mA?g?1for 800 cycles. Owing to the superiorities of high electrochemical performances and easy preparation, the Fe3O4/Cu@G composite shows encouraging application potential to be an advanced anode material for lithium storage.Graphical abstractFe3O4octahedra with bimodal conductive network of nanoporous Cu and graphene nanosheets are simply prepared for better Li storage as an advanced anode material.Display OmittedHighlights?Fe3O4octahedra fixed in Cu conductive network is fabricated by dealloying method.?Fe3O4/Cu@G is made based on the electrostatic assembly with graphene oxide.?Fe3O4/Cu@G shows much higher cycling stability than Fe3O4, Fe3O4/Cu, and Fe3O4@G.?The Cu network and graphene greatly modify the lithium storage performances of Fe3O4.