A twins-structural Sn@C core–shell composite as anode materials for lithium-ion batteries
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© 2016 Taylor & Francis. In this paper, we report a facile method to prepare a twins-structural Sn@C core–shell composite that is used as anode materials for lithium-ion batteries. Its surface morphology and microstructures were characterized by the scanning electron microscope, X-ray diffraction, and transmission electron microscope. The electrochemical performances of Sn@C were measured by charge–discharge tests, cyclic voltammogram, and electrochemical impedance spectra. It is shown that such a composite exhibits a high initial specific capacity of 970 mA h g-1 and a capacity retention of 400 mA h g-1 after 50 cycles at the current density of 100 mA g-1.