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Crystalline tin (Sn) nanostructures and tin/reduced graphene oxide (Sn/RGO) composites have been synthesized with different morphologies via a facile reduction method. The effects of the morphology and particle size on the cycling stability of Sn and Sn/RGO as Li-ion battery anodes were investigated. For crystalline Sn, different morphologies of nanosheets, nanorods, nanospheres and nanoparticles were obtained by adjusting the reaction conditions, such as the reaction temperature and precursor. The associated electrodes exhibited a rapid capacity decay and weak cycling stability. However, smallsized Sn particles displayed a relatively more stable cycling performance than that of the larger-sized particles. Compared with Sn, the cycling stability of the Sn/RGO composites was greatly improved with a long cycling life, even at a larger current density. For instance, the Sn/RGO electrode, in which spherical Sn nanoparticles with diameters of ~ 5 nm are uniformly dispersed on the RGO surface, delivers a reversible discharge capacity of 355 mAh g -1 at the end of 50 cycles at 200 mA g -1 .

Morphology Control and Cycling Stability of Sn Nanostructures and Sn/RGO Composites as Lithium-Ion Battery Anodes