Yolk-shell SiO2 wrapped by reduced graphene oxide for high performance lithium-ion battery anode

Abstract

In order to alleviate the rapid capacity attenuation caused by huge volume expansion and low electronic conductivity during SiO2 charge and discharge, the rGO@yolk-shell SiO2 structure is designed by using reduced graphene oxide (rGO) as the conductive network and loading the carbon-coated SiO2 as the yolk-shell structure. The well-designed yolk-shell structure can slow down the volume change without destroying the carbon layer. The conductive networks of rGO, in conjunction with this carbon layer, contribute to the efficient electron transport pathway. When measured as anode material for lithium-ion batteries, rGO@yolk-shell SiO2 exhibits a long cycle performance of 616 mAh g−1 after 358 cycles at 0.1 A g−1.