▎ 摘　　要

There has been strong recent interest in using SnS2/graphene nanocomposites for reversible Li+ storage. Although SnS2 and graphene are 2D nanomaterials, many of their composites reported to date have a random 3D structure. We present here a stacked SnS2/graphene nanocomposite that retains many of the original 2D features of the graphene nanosheets. As a result, significantly improved Li+-storage properties were shown including: 1)good cycle stability (delithiation capacity of 1063mAhg(-1) for 100 cycles at 200mAg(-1) and 918mAhg(-1) for 500 cycles at 1Ag(-1)); 2)high first-cycle coulombic efficiency (89.7%); 3)high reversibility of the conversion reaction SnS2+4Li(+)+4e(+) -> Sn+2Li(2)S (87.5%); and 4)high rate performance (712mAhg(-1) at 5Ag(-1)). Such good performance corresponds well with a 2D construction, in which Sn nanoparticles are firmly held by graphene nanosheets. The conversion reaction becomes more reversible in the presence of the Sn nanoparticles to contribute to the additional storage capacity.