Electrochemical properties of vanadium pentoxide xerogel films

Abstract

Vanadium pentoxide xerogel (VXG) films were prepared by rapid quenching, then coin type 2016 size lithium rechargeable batteries were assembled and tested with the VXG film electrodes and lithium anodes. Electrochemical impedance spectroscopy (EIS) analysis result reveals the expected response for intercalation, except that there is almost no Warburg (diffusion) component. Analyses results of cyclic voltammetry (CV), constant discharge (CD) and discharge-charge(DC) indicate that the sample achieves a high initial discharge specific capacity of approximate 400 mA · h/g and a corresponding efficiency of 97 % in the voltage diapason of 1.5–4.0 V with a draining current of 60 mA/g. Its preservation ratio of capacity still keeps as high as 85 % even after 100 cycles. The good electrochemical performance indicates that VXG film material is a promising cathode for lithium rechargeable batteries.

Keywords

vanadium pentoxide xerogel films / electrochemical impedance spectroscopy / specific capacity / lithium rechargeable batteries