A twins-structural Sn@C core-shell composite as anode materials for lithium-ion batteries

摘要

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 970mAhg(-1) and a capacity retention of 400mAhg(-1) after 50 cycles at the current density of 100mAg(-1).