A structured SnO 2 -reduced graphene oxide (RGO) nanocomposite has been synthesized with SnO 2 nanoparticles ($5 nm) anchored on a RGO framework. It has been successfully applied as an anode material in sodium-ion batteries. The electrode delivers a reversible Na-storage capacity of 330 mA h g À1 with an outstanding capacity retention of 81.3% over 150 cycles. Moreover, it possesses a relatively good rate capability, exhibiting a capacity retention of 25.8% at high rate (1000 mA h g À1 ). With its combined advantages of low cost and environmental benignity, the SnO 2 -RGO nanocomposite would be a promising anode for Na-ion batteries.

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