Mg Intercalation Properties into V 2 O 5 gel/Carbon Composites under High-Rate Condition

Abstract

carbon composites were prepared from a homogeneous suspension in which vanadium pentoxide sol and acetylene black powder were mixed with acetone acting as a surfactant. The composite was loaded on indium-tin oxide (ITO)-coated glass, and then the magnesium intercalation property and the high-rate charge-discharge performance were evaluated in an electrolyte of acetonitrile at room temperature. In cyclic voltammetry, two main peaks of a reversible redox reaction were observed. It was determined that 1.84 mol of Mg per mol of were inserted in the first cycle at a relatively slow sweep rate of 0.1 mV s−1, which corresponds to a specific capacity of 540 mAh Galvanostatic charge-discharge tests at various current densities showed a high capacity of about 600 mAh at a current density of 1.0 A and about 300 mAh was maintained even at 20 A © 2003 The Electrochemical Society. All rights reserved.