▎ 摘　　要

The carbon-coated Si nanoparticle/graphene composite (Si@C/G) was prepared through a thermal annealing of the freeze-dried mixture of Si nanoparticles, sucrose, and graphene oxide. This straightforward approach realizes the carbon coating of Si nanoparticles and the good dispersion of graphene sheets in Si@C nanoparticles simultaneously. As an anode material for lithium-ion batteries, the Si@C/G exhibits high Coulombic efficiency, good cycling stability of 1410 mAh g(-1) at a current density of 500 mA g(-1) after 100 cycles, and superior rate capability. Such excellent electrochemical performance could be attributed to the combined work of carbon shells and electrically conductive graphene networks. This study proposes a strategy for other electrode materials with huge volume changes and low electrical conductivity to improve the lithium storage performance. Crown Copyright (C) 2013 Published by Elsevier Ltd. All rights reserved.