Synthesis and electrochemical properties of Ag0.333V2O5-V2O5 core-shell nanobelts for rechargeable lithium batteries

Ag0.333V2O5-V2O5 core-shell nanobelts have been synthesized by a facile homogeneous reaction between peroxovanadic acid and AgNO3 under hydrothermal conditions. The formation of Ag0.333V2O5-V2O5 core-shell nanobelts is time dependent: Ag0.333V2O5 nanobelts are formed firstly, and then V2O5 grows on the Ag0.333V2O5 surfaces. The core-shell nanobelts exhibit stable lithium-ion intercalation/deintercalation reversibility and deliver specific discharge capacities of around 276.4 mAhg(-1) after 50 cycles at a rate of 0.25 Ag-1. The value is lowered to 228 mAhg(-1) at 0.5 Ag-1, and 147.2 mAhg(-1) at 0.75 Ag-1. The good electrochemical properties of Ag0.333V2O5-V2O5 core-shell nanobelts make them a promising candidate as a cathode material for rechargeable lithium batteries. (C) 2011 Elsevier B.V. All rights reserved.