Facile Fabrication of Bicomponent CoO/CoFe2O4-N-Doped Graphene Hybrids with Ultrahigh Lithium Storage Capacity

A facile strategy is developed to fabricate bicomponent CoO/CoFe2O4-N-doped graphene hybrids (CoO/CoFe2O4 center dot NG). These hybrids are demonstrated to be potential high-performance anodes for lithium-ion batteries (LIBs). The CoO/CoFe2O4 nanoplatelets are finely dispersed on the surface of N-doped graphene nanosheets (CoO/CoFe2O4-NG). The CoO/CoFe2O4-NG electrode exhibits ultrahigh specific capacity with 1172 mA h g(-1) at 500 mA g(-1) and 970 mA h g(-1) at 1000 mA g(-1) as well as excellent cycle stability due to the synergetic effects of N-doped graphene and CoO/CoFe2O4 nanoplatelets. The well-dispersed bicomponent CoO/CoFe2O4 is responsible for the high specific capacity. The N-doped graphene with high specific surface area has dual roles: to provide active sites for dispersing the CoO/CoFe2O4 species and to function as an electrical conducting matrix for fast charge transfer. This method provides a simple and efficient way to configure the hybridized electrode materials with high lithium storage capacity.