Electrochromic properties of sol-gel deposited V2O5 and TiO2-V2O5 binary thin films

Transparent mixed phase (1 - x)V2O5 -xTiO(2) (x=0,0.1,0.2,0.3,0.4) thin fil ms were prepared on indium tin oxide (ITO) coated glass via sol-gel process . The films were characterized by cyclic voltammetry, optical spectroscopy, scanning electron microscopy, IR and X-ray diffractometer. Electrochemical lithium insertion/extraction showed that the porous structure of sol-gel ( 1 - x)V2O5-xTiO(2) thin films exhibited good recharge ability of Li+/e(-) i nsertion/extraction process. For a 220 nm thick (1 - x)V2O5-xTiO(2) film wi th 90% V2O5, the capacity of charge exchange reached 9 mC/cm(2). In both Li + intercalated and free states, the films were highly transparent to visibl e light. Such films have potential applications in counter electrodes for e lectrochromic smart windows and other electrochemical devices.