Hydrothermal synthesis of uniform tin oxide nanoparticles on reduced activated graphene oxide as anode material for lithium-ion batteries

Add time:07/30/2019    Source:sciencedirect.com

SnO2 has been considered as one of the promising anode materials for Lithium-ion batteries (LIBs) owing to its high theoretical specific capacity and low operating potential. However, serious volume change during repetitive cycling and formation of unstable solid electrolyte interface during the lithiation/delithiation process often lead to severe capacity fading. In this work, we report an approach to improve the electrochemical performance of SnO2 by stabilizing it on the surface of reduced activated graphene oxide (rAGO). The rAGO/SnO2 delivers a high reversible capacity of 720 mA h g−1 after 200 cycles at a current density of 200 mA g−1. At a high current density of 500 mA g−1, rAGO/SnO2 maintained a specific capacity of 569 mA h g−1 which is superior compared to that of pristine SnO2 and rGO/SnO2. The preeminent electrochemical performance of rAGO/SnO2 implies that rAGO plays a crucial role in the buffering effect, electrons and Li ions transfer. Based on the investigations above, we can conclude that the activated pores play a crucial role in increasing the rate performance and cycle stability of SnO2.

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