High-performance Cu-doped vanadium oxide (CuxV2O5)prepared by rapid precipitation method for rechargeable batteries

CuxV2O1 (x=0, 0.15, 0.25) was prepared by acidifying aqueous NaVO3 with diluted H2SO4 followed by mixing Cu powder with V2O5 precipitate. The method is a rapid synthesis procedure, compared to the ion-exchange method. The effect of copper on the characteristics of V2O5 was also investigated. These materials maintained the layered structure typical Of V2O5 xerogel. It was found that the copper-doped V2O5 material exhibits better cycle performance than the undoped V2O5, Cu0.25V2O5 showed an initial discharge capacity of 259.2 mA h/g in the potential range of 1.5-4.0 Vat 96 mA/g (C/3). After the 100 consecutive cycles, the specific capacity of the Cu0.25V2O5 electrode maintained 219.5 mA h/g. The doped material prepared by the rapid method shows better a cycling performance, compared to the ion-exchange method. (c) 2006 Elsevier B.V. All rights reserved.