Co2SnO4 nanocrystals anchored on graphene sheets as high-performance electrodes for lithium-ion batteries

Cubic spinel Co2SnO4/graphene sheets (Co2SnO4/G) nanocomposites are synthesized by a facile hydrothermal process in alkaline solution, using SnCl4 center dot 4H(2)O, CoCl2 center dot 6H(2)O and graphene oxide (GO) as the precursor. The structure and morphology of the resulting nanocomposites are characterized with Xray diffraction (XRD), scanning electron microscopy (SEM) and transmission electron microscopy (TEM). Co2SnO4 nanoparticles are uniformly dispersed among graphene sheets, with a size of 80-150 nm. As anode material for lithium-ion batteries, the galvanostatic charge/discharge and cyclic voltammetry are conducted to indicate the electrochemical performance of Co2SnO4/G nanocomposites. Co2SnO4/G nanocomposites exhibit an improved electrochemical performance compared with pure Co2SnO4 nanoparticles, such as high reversible capacities, good cycling stability and excellent rate performance. The initial charge and discharge capacities are 996.1 mAh g(-1) and 1424.8 mAh g(-1). After 100 cycles, the reversible charge/discharge capacities still remain 1046/1061.1 mAh g(-1) at the current density of 100 mA g(-1). Co2SnO4 nanoparticles coated by Graphene sheets with superior electrochemical performance indicate that Co2SnO4/G nanocomposites are promising electrode materials used for high-storage lithium-ion batteries. (C) 2014 Elsevier Ltd. All rights reserved.