Nanohybrid electrodes of porous hollow SnO2 and graphene aerogel for lithium ion battery anodes

초록

In this work, we present the nanohybrid electrode (termed as p-h-SnO2/GA) of porous hollow SnO2 (p-h-SnO2) integrated on the surface of graphene aerogel (GA) for anodes with large lithium storage capacity. Selective etching of Ni from Ni3Sn2 nanoparticles produces the porous hollow nanostructure of SnO2, which is important for providing the structural flexibility that can accommodate the volume change of SnO2 during the lithiation and delithiation processes. GA also serves as a buffer for the volume change of SnO2 and induces effective charge transports through its interconnected porous network structure. These combined advantages of p-h-SnO2 and GA enable a reversible Li storage capacity as high as 620 mAh g−1 with ∼100% Coulombic efficiency at a specific current of 50 mA g−1 over 200 charge–discharge cycles and ∼71% of rate-retention capability over the specific currents of 100 mA g−1–1 A g−1. It makes this nanohybrid electrodes an attractive candidate for high-performance lithium ion battery anode.

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