Preparation and Application of Carbon-Coated SnO2 as Anode Material in Lithium Ion Batteries

SnO2 nanosphere were prepared by a refluxing method, and SnO2/C nanosphere have been prepared by hydrothremal with -CD. Scanning electron microscopy and X-ray powder diffraction results show that the products are SnO2 nanosphere with a diameter of about 30-40 nm which covered uniform carbon layer. After carbon-coated, the structural stability and electrical conductivity of the material are increased. The discharge capacity remains 749 mAh/g at current density of 100 mA/g after 200 cycles, and after high-current charge and discharge (100 to 800 mA/g ), the discharge capacity remains 620 mAh/g at current density of 100 mA/g.