Synthesis of Sandwich-like Carbon@SnO_2@Carbon Composite Hollow Microspheres with High Rate Capability and Stability for Lithium-ion Batteries

摘要

In this work, we prepared the sandwich-like carbon@SnO_2@carbon hollow spheres by templating against polystyrene spheres. The hollow spheres are characterized by means of scanning electron microscopy (SEM), transmission electron microscopy (TEM), X-ray diffraction (XRD). The electrochemical performance as the anodes of lithium-ions batteries are studied by the cyclic voltammogram (CV) and galvanostatic discharge-charge voltage tests. Because of the interesting structure, the as prepared carbon@SnO_2@carbon hollow spheres deliver a reversible capacity of 492 mA h g~(-1) after 50 cycles at a high current density of 400 mA g~(-1).