Preparation and electrochemical properties of graphene‐supported Si‐TiO 2 nanospheres as anode material for Li ‐ion batteries

Graphene‐supported Si‐TiO 2 (Si‐Ti‐GE) composites have been synthesized by a simple polymerization and sintering method. In the Si‐Ti‐GE composites, many small Si‐TiO 2 particles are scattered on the graphene sheet, which can mitigate the agglomeration of the material and further reduce the particle size. The initial discharge capacities of Si‐TiO 2 , Si‐Ti‐GE‐1, Si‐Ti‐GE‐2, and Si‐Ti‐GE‐3 are 336.9, 337.2, 339.8, and 356.6 mAh g −1 at the current density of 200 mA g −1 , respectively. The discharge rate capacities of TiO 2 , Si‐TiO 2 , and Si‐Ti‐GE‐3 composites retain 57.5%, 41.7%, and 82.1% at the current density from 100 to 400 mA g −1 , respectively. Therefore, the introduction of graphene not only could facilitate the Li + diffusion and electron transport but also could make better electrical conductivity.