▎ 摘　　要

Si/graphene nanocomposites with different weight ratios were successfully prepared by ball-milling of commercially available Si nanoparticles and graphene oxide (GO) nanosheets. It was demonstrated that Si nanoparticles within the Si/graphene nanocomposites were well distributed onto the flexible graphene nanosheets. Compared to the pristine Si nanoparticles anode, the Si/graphene composite anodes showed an enhanced reversible capacity and cyclic performance, highlighting the advantages of anchoring Si nanoparticles on graphene sheets. The enhancement on electrochemical performance could be ascribed to the fact that graphene nanosheets within the Si/graphene nanocomposites could act as a flexible conductive scaffold network to maintain excellent electronic contact, improve ionic conductivity and charge transfer as well as accommodate the large volume change of Si during the lithiation/delithiation process.