Lithium-doped tungsten oxide can be used to fabricate electrochromic device in the form of a thin film with better coloration and electrochromic properties than undoped tungsten oxide. According to the researchers, the electrochromic films can be prepared by electron beam evaporation on ITO glasses under the parameters of room temperature, with thicknesses of about 530 nm. Wherein, xLi2O-(1?x)WO3 powders were mixed with WO3 and Li2O and pressed into target pellets.
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It was expected that the amount of charge stored in the electrochromic devices could be enhanced by using the doping method in the cathode materials. The experimental results show that as the composition of Li0.18W0.82O2.6 powder was formed, the optimal characteristics of electrochromic device can be obtained. In which, as a voltage of 3.5 V was applied on electrochromic device, a transmittance change of 53.1%, an optical density of 0.502, an intercalation charge of 12.9 mC/cm2 and a coloration efficiency of 41.6 cm2/C at a wavelength of 550 nm can be achieved. These results demonstrate that Li2O doping in WO3 films, or lithium-doped tungsten oxide, could effectively improve the coloration and electrochromic properties of electrochromic devices.
