Electrochemical properties of vanadium pentoxide xerogel films^①

来源期刊：中南大学学报(英文版)2005年第5期

论文作者：张勇 胡信国 刘玉文 程玉山

文章页码：561 - 566

Key words：vanadium pentoxide xerogel films; electrochemical impedance spectroscopy; specific capacity; lithium rechargeable batteries

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. Electro chemical 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.