Optical and electrochemical properties of vanadium pentoxide porous Him prepared by sol-gel technique

摘要

Thin films of V_2O_5, especially vanadium oxide films with nano- and micro-structures, perform well as cathode material for Li ion batteries and charge storage devices. Thin films of V_2O_5 with different porosity were obtained by dip-coating sol-gel technique. V_2O_5 sols were prepared by dissolution of V_2O_5 powder in benzyl alcohol and isopropyl alcohol in proper proportion. Optical property and porosity of films were characterized by FTIR and ellipsometer. Electrochemical characterization was recorded by chronopotentiometry(CP) and cyclic voltammetry(CV). Furthermore, the study shows that the porous structures of V_2O_5 films had an effect on the stability and reversibility of the films.