The confinement of SnO2 nanocrystals into 3D RGO architectures for improved rate and cyclic performance of LIB anode

초록

In this study, we demonstrate the synthesis of a composite with SnO2 nanoparticles anchored on three-dimensional (3D) reduced graphene oxide (RGO) as an anode for Li ion batteries (LIBs). SnO2 nanoparticles were uniformly deposited on the surface of RGO sheets and the resulting RGO-SnO2 architecture had an interconnected hierarchical structure. This hierarchical RGO-SnO2 architecture exhibited outstanding electrochemical performance with a high reversible capacity of 810 mAh g(-1) at 0.1 A g(-1) and a high rate capacity of 210 mAh g(-1) at 2 A g(-1). Moreover, this architecture achieves 99% capacity retention even after 150 cycles at 0.1 A g(-1). The improved performance of the RGO-SnO2 architecture is attributed to the uniform dispersion of SnO2 nanoparticles and the 3D macroporous continuity, which afford a highly accessible area, easy ion accessibility, a short ion diffusion length, and rapid mass and charge transport. The composite described here is practically useful in the development of high-energy-density anode materials for LIBs.

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