▎ 摘　　要

Reduced graphene oxide@nickel sulfide (NiS) composites are synthesized by a solvothermal method. Uniformly dispersed NiS nanoparticles with a size of 15-25 nm are embedded to the surface of a three-dimensional (3D) reduced graphene oxide. The favorable 3D-framework with a large amount of pores has been characterized systematically. As a Li-ion battery anode, the reduced graphene oxide@NiS anode keeps a reversible capacity of 1328.7 mAh g(-1) at 0.1 A g(-1) after 120 cycles. Meanwhile, it shows an enhanced rate capability of 673.6 mAh g(-1) at 1.0 A g(-1). The enhanced reversible capacity and cycling stability is ascribed to the reduced graphene oxide and its unique 3D porous nanostructure. Furthermore, the existence of C-S bonds make reduced graphene oxide and nickel sulfide in the composite combine better during the cycling process, and enhance their synergistic effect. Since that, the conductivity, volume-variation and active sites of the composites are greatly improved.