Abstract
SnO2-reduced graphene oxide (SnO2-rGO) nanocomposites are successfully synthesized via a rapid microwave-assisted method (within 150 s). Scanning electron microscopy (SEM) and transmission electron microscopy (TEM) observations show the ultrafine SnO2 nanoparticles (~3 nm) are uniformly anchored onto the rGO. The typical SnO2-rGO exhibits a high initial reversible capacity of 260 mAh g−1 at 50 mA g−1, which is higher than that (45 mAh g−1) of the bare SnO2 electrode. The SnO2-rGO electrode also shows high cycling stability (79.6% capacity retention after 100 cycles) and rate capability (150 mAh g−1 at 500 mA g−1). The improved electrochemical performance of the SnO2-rGO is ascribed to extremely tiny SnO2 nanoparticles well distributed on the surface of the rGO and the conductive frameworks provided by rGO, so as to alleviate the aggregation of SnO2 and buffer the volumetric change during charging and discharging.
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