||In this study, the LixNi1-xO powder was mixed and sintered by the NiO and Li2CO3 powders to produce the LixNi1-xO electrochromic film which was deposited by electron beam evaporation. Doping Li2CO3 not only can improve the NiO film structure but also increase the amount of charges stored, which makes the complementary electrochromic device (CECD) behave better.|
Experimental results reveal that as the 1 wt.% of Li2CO3 was doped into NiO, the LixNi1-xO material was formed. The optimal deposition conditions of LixNi1-xO films were oxygen pressure of 1×10-3 Torr at room temperature (R.T.) by electron beam evaporation. The thicknesses of LixNi1-xO films were about 530 nm. The best characteristics of electrochromic CECD revealed a transmittance change (ΔT%) of 58.4%, an optical density (ΔOD) of 0.733, an intercalation charge (Q) of 8.02 mC/cm2, an coloration efficiency(η) of 91.3 cm2/C and a specific capacitance of 18.13 μF/cm2, which are, in turn, 22.3% and 23.5% increasing of the coloration efficiency (η = 74.6 cm2/C) and specific capacitance (14.68 μF/cm2) for the CECD made of NiO film. This results demonstrate that the doping of Li2CO3 can effectively improve the charges-storing amount of NiO film and CECD electrochromic characteristics. After 96h the ΔT of colored CECD is increased merely 7.8%, which shows that the CECD with LixNi1-xO film has a good memory effect.