A Sheet-like SnO2@SiO2/graphite Composite as Anode Material with Excellent Performance for Lithium-Ion Batteries
Ke Jin, YefengFeng, Bingwen Yang, Kaidan Wu, Xiaoqian Deng, Miao He
Abstract
SnO2-based composites are widely used as anode materials for lithium-ion batteries owing to their high theoretical capacities. However, their poor stability limits their practical applications. Therefore, in this study, SnO2@SiO2/graphite composite was designed and fabricated using the balling method. SiO2 effectively buffers the volume expansion of SnO2 during the lithiation and delithiation processes. Furthermore, the graphite ground into the sheet wrapping the hybrid SnO2 and SiO2 nanoparticles improves the volume change tolerance and enhances the electrochemical properties of the materials. As a result, the SnO2@SiO2/graphite composite exhibits a high specific capacity and excellent rate performance. In the initial charge/discharge cycle, the capacity of the SnO2@SiO2/graphite anode reaches 2489 mA h g -1 at a current density of 200 mA g -1 and retains a capacity of 1132 mA h g -1 after 80 cycles, which is better than that of the SnO2@graphite composite and SnO2.