CuO/C microspheres as anode materials for lithium ion batteries

CuO/C microspheres are prepared by calcining CuCl(2)/resorcinol-formaldehyde (RF) gel in argon atmosphere followed by a subsequent oxidation process using H(2)O(2) solution. The microstructure and morphology of materials are characterized by means of X-ray diffraction (XRD), scanning electron microscopy (SEM), and transition electron microscopy (TEM). Carbon microspheres have an average diameter of about 2 mu m, and CuO particles with the sizes of 50-200 nm disperse in these microspheres. The electrochemical properties of CuO/C microspheres as anode materials for lithium ion batteries are investigated by galvanostatic discharge-charge and cyclic voltammetry (CV) tests. The results show that CuO/C microspheres deliver discharge and charge capacities of 470 and 440 mAh g(-1) after 50 cycles, and they also exhibit better rate capability than that of pure CuO. It is believed that the carbon microspheres play an important role in their electrochemical properties. (C) 2011 Elsevier Ltd. All rights reserved.