▎ 摘　　要

A nanosized Si/graphene composite was prepared by magnesium thermal reduction of the in-situ generated SiO2 particles on graphene sheets, in which about 5 nm-silicon nanopartides were homogeneously loaded on graphene sheets. The unique structure can not only accommodate the large volume changes, but also maintain electronic conductivity during Li-ion insertion/extraction. The composite delivers an initial reversible capacity of 1750 mAh/g at a current rate of 100 mA/g and exhibits an excellent cycling stability with a capacity of 1374 mAh/g over 120 cycles. (C) 2013 Elsevier B.V. All rights reserved.