All-solid-state complementary electrochromic windows based on the oxymethylene-linked polyoxyethylene complexed with LiClO₄

Oxymethylene-linked polyoxyethylene complexed with LiClO₄ at a Li/EO molar ratio of 0.05 has a conductivity of 4.7 × 10 ^-4 S · cm^-1 at 25°C and a transmittancy of 90%. It is a promising electrolyte for an all-solid-state complementary electrochromic window using WO₃ and NiO_x. The modulation depth of the window exceeds 50% from 700 nm to 900 nm. The electrochromic ability of the window increases with temperature and lithium salt concentration and the window also exhibits good storage property under open circuit. Current and optical responses of the window as well as the electrochromic process are also discussed.