Three-Dimensional Graphene/Single-Walled Carbon Nanotube Aerogel Anchored with SnO₂ Nanoparticles for High Performance Lithium Storage

A unique 3D graphene-single walled carbon nanotube (G-SWNT) aerogel anchored with SnO 2 nanoparticles (SnO 2 @G-SWCNT) is fabricated by the hydrothermal self-assembly process. The influences of mass ratio of SWCNT to graphene on structure and electrochemical properties of SnO 2 @G-SWCNT are investigated systematically. The SnO 2 @G-SWCNT composites show excellent electrochemical performance in Li-ion batteries; for instance, at a current density of 100 mA g –1, a specific capacity of 758 mAh g –1 was obtained for the SnO 2 @G-SWCNT with 50% SWCNT in G-SWCNT and the Coulombic efficiency is close to 100% after 200 cycles; even at current density of 1 A g –1, it can still maintain a stable specific capacity of 537 mAh g –1 after 300 cycles. It is believed that the 3D G-SWNT architecture provides a flexible conductive matrix for loading the SnO 2, facilitating the electronic and ionic transportation and mitigating the volume variation of the SnO 2 during lithiation/delithiation. This work also provides a facile and reasonable strategy to solve the pulverization and agglomeration problem of other transition metal oxides as electrode materials.