Reduced Graphene oxide -coated 3D interconnected SiO₂ Nanoparticles with Enhanced Lithium Storage Performance

摘要

3D interconnected SiO2 nanoparticles coated by reduced graphene oxide (rGO) (SiO2@rGO) werefabricated easily by online hydrolysis and subsequent condensation of the precursortetraethylorthosilicate (TEOS) in the dispersed graphene oxide (GO) sol, followed by the reduction ofGO using hydrazine hydrate. The as-obtained 3D interconnected SiO2 nanoparticles coated by rGOcomposites as anode material for lithium ion rechargeable batteries (LIBs) delivers a reversibledischarge capacity of 490.7 mAh g-1 at a current density of 100 mA g-1 after 60 cycles with thecoulombic efficiency of nearly 98%. Compared to the bare nano-SiO2, the enhanced lithium storageperformance could be attributed to its unique 3D interconnected network space structure toaccommodate the volume variation during cycled lithiation/delithiation process.