Layer-by-layer assembled MoO2-graphene thin film as a high-capacity and binder-free anode for lithium-ion batteries

Thin films of MoO₂ nanoparticles and graphene sheets are created by layer-by-layer (LBL) assembly as binder-free anodes for lithium-ion batteries. Both anionic polyoxometalate clusters and graphene oxide nanosheets with oxygen functional groups on both basal planes and edges are assembled into LBL films with the aid of a cationic polyelectrolyte. After a subsequent thermal treatment in an Ar-H₂ atmosphere, hybrid MoO₂-graphene films with three-dimensionally interconnected nanopores are formed, which comprise ultrafine MoO₂ nanoparticles homogeneously embedded in the porous network of graphene nanosheets. When used as an anode for lithium-ion batteries, the MoO₂-graphene thin-film electrode shows superior electrochemical performance with high specific capacity and excellent cyclability. A high specific capacity of 675.9 mA h g^-1 after 100 discharge-charge cycles is achieved, indicating a promising anode candidate for lithium-storage applications.Thin films of MoO₂ nanoparticles and graphene sheets are created by layer-by-layer (LBL) assembly as binder-free anodes for lithium-ion batteries. Both anionic polyoxometalate clusters and graphene oxide nanosheets with oxygen functional groups on both basal planes and edges are assembled into LBL films with the aid of a cationic polyelectrolyte. After a subsequent thermal treatment in an Ar-H₂ atmosphere, hybrid MoO₂-graphene films with three-dimensionally interconnected nanopores are formed, which comprise ultrafine MoO₂ nanoparticles homogeneously embedded in the porous network of graphene nanosheets. When used as an anode for lithium-ion batteries, the MoO₂-graphene thin-film electrode shows superior electrochemical performance with high specific capacity and excellent cyclability. A high specific capacity of 675.9 mA h g^-1 after 100 discharge-charge cycles is achieved, indicating a promising anode candidate for lithium-storage applications.

Electronic supplementary information (ESI) available: SEM, EDX and TG results. See DOI: 10.1039/c2nr30742a