Preparation of Core-shell Structure Carbon@SnM2 (M=S, O) Microspheres Composites and Application in Lithium-ion Batteries

Abstract

We report a fast solvothermal approach to fabricate the core-shell structure carbon@SnS2 microspheres composites (C@SnS2). And the same structured carbon@SnO2 microspheres composites (C@SnS2) were synthesized by calcinating of C@SnS2 at 500°C in air. Then the phase structures and the morphologies of the carbon@SnM2 (M=S, O) microspheres composites (C@SnM2) were observed by X-ray diffraction analysis (XRD), scanning electron microscopy (SEM) and transmission electron microscopy(TEM). The C@SnM2 were composed of the uniform micron-sized carbon spheres with 1.5μm as the core and SnM2 with 200nm as the shell. When putting it as the anode electrodes of lithium-ion batteries, the C@SnS2 showed higher charge/discharge capacity, rate capability and cycling reversibility than C@SnO2. Those excellent electrochemical performances make the C@SnS2 to be a predominated candidate for the lithium-ion batteries.