Integration of network-like porous NiMoO4 nanoarchitectures assembled with ultrathin mesoporous nanosheets on three-dimensional graphene foam for highly reversible lithium storage

Interconnected ultrathin mesoporous nickel molybdate (NiMoO4) nanosheets with a network-like porous structure supported on a three-dimensional (3D) macroporous graphene network were successfully synthesized by a facile chemical vapor deposition (CVD) method and subsequent hydrothermal route. The building block NiMoO4 nanosheets are curved with a thickness as small as 3-5 nm, and randomly connected with the adjacent nanosheets to self-assemble into continuous, interconnected and porous architectures. The NiMoO4 nanosheets supported on the 3D graphene network could be directly evaluated as binder-free, integrated anodes for lithium-ion batteries (LIBs). Such unique 3D integrated architectures exhibited remarkable electrochemical performance with a high reversible capacity of 1155.54 mA h g(-1) at a current density of 200 mA g(-1), and an excellent cycling ability (89% of the initial reversible capacity remained after 120 cycles). The superior electrochemical performances could be attributed to the open network structure constituted of interconnected ultrathin mesoporous NiMoO4 nanosheets directly grown on current collectors that could improve electron transport and enhance electrolyte diffusion efficiency.