We report a facile method to synthesize highly dispersive MS (M = Co and Ni) nanomaterials anchored on graphene sheets as an advanced anode material for reversible lithium storage. The obtained MS (M = Co and Ni) nanomaterials and graphene formed a sheet-on-sheet composite structure (Figure 1), which can not only facilitate ions/electrons transport along the interfaces, but also effectively prevent MS nanomaterials aggregation during the lithium storage processes. As a result, the graphene-supported CoS nanofibers and NiS nanosheets exhibit a high reversible capacity of 939 and 521 mA h g^-1, respectively, with a Coulombic efficiency of over 98 % after 100 cycles at a current density of 100 mA g^-1(Figure 2).

The excellent lithium storage properties of the MS-graphene composites can be attributed to the layered structure of the MS-graphene composites possessing the larger electrode-electrolyte contact area, the shorter ionic diffusion length and the easier transportation of lithium ions. This strategy of generating the composite structure can be extended to synthesize other metal sulfides-graphene nanomaterials for lithium-ion batteries.