Synthesis of ZnV2O6 powder and its cathodic performance for lithium secondary battery

ZnV2O6 powder was successfully synthesized by an effective and simple route-rheological phase reaction method and investigated as a cathode material for lithium-ion batteries. The phase purity. structures, morphologies of the prepared powder were characterized by X-ray diffraction (XRD), transmission electron microscope (TEM), infrared (IR) spectroscopy and X-ray photo-electron spectrometry (XPS), respectively. The results show that the crystallinity becomes better with the increase in synthesis temperature. The charge-discharge experiments were performed to investigate the electrochemical properties of ZnV2O6 powder at a constant current density of 30 mAg(-1) in a potential range of 2.0 and 3.6 V. The discharge capacity (288.7 mAh g(-1)) showed only 16.7% loss of the initial discharge capacity (347.4 mAh g(-1)) after 40 cycles. The data revealed that the brannerite structure of ZnV2O6 obtained at 550 degrees C was very stabile during the charge-discharge process. (C) 2008 Elsevier B.V. All rights reserved.