Reduced graphene oxide decorated porous SnO2 nanotubes with enhanced sodium storage

Reduced graphene oxide coated porous SnO2 nanotubes are designed as anode for sodium ion batteries (SIBs). The nanocomposites deliver good cycling stability with the capacity retention of 91% extending to 100 cycles at a current density of 50 mA g(-1) in the voltage range of 0.01-3.0 V. Moreover, they reveal good rate capability with the reversible capacities of 242.6, 207.7, 173.4, and 140.3 mAh g(-1) at various current densities of 50, 100, 200, and 400 mA g(-1), respectively. These results indicate that the coating of reduced graphene oxide is an effective strategy to buffer volume change and improve charge transfer resistance during Na+ ion insertion/extraction for SIBs. (C) 2017 Elsevier B.V. All rights reserved.