▎ 摘　　要

SiO2 @ carbon-graphene (SiO2 @ C-G) hybrids with excellent electrochemical performance were prepared by the self. assembly of colloidal silica, sucrose and graphene oxide followed by ultrasonic. assisted hydrothermal and heat treatments. The mass ratio of silica to sucrose is crucial to the electrochemical performance of the resulting hybrids. A hybrid with a mass ratio of silica to sucrose of 0. 15 shows the best reversible lithium storage performance, delivering an initial discharge capacity of 906 mAh . g(-1) and a capacity of 542 mAh . g(-1) at the 216 th cycle at a current density of 100 mA . g(-1). The excellent cycling ability and high reversible capacity are attributed to a synergetic effect of the good conductivity of the SiO2 @ C-G hybrids, the small SiO2 particle size and the good dispersion of SiO2 nanoparticles in the hybrids. This methodology may provide a simple, scalable and eco. friendly strategy to prepare superior electrode materials from cheap and low electrical conductivity metal oxides.