Electrochemical and catalytic properties of V2O5/Al2O3 in rechargeable Li-O-2 batteries

Abstract

An Al2O3-supported V2O5 composite (V2O5/Al2O3) was synthesized and its role in controlling oxygen reduction/evolution reaction during Li-O-2 battery operation was studied. The prepared V2O5/Al2O3 composite catalyst was systematically characterized using X-ray diffraction, scanning electron microscopy, and particle size analysis. Energy-dispersive X-ray spectroscopic measurements confirmed the uniform distribution of V2O5 in the Al2O3 support catalyst. Li-O-2 cells using the V2O5/Al2O3 composite as the cathode catalyst showed lower overpotentials than V2O5-carbon composites and pure carbon cathodes. The cyclic behavior confirmed that the catalytic effect of the prepared composite not only reduced the overpotentials, but also improved the specific capacities. (C) 2013 Elsevier Ltd. All rights reserved.