Abstract: A novel ausolid-state electrochromic window was prepared by using WO₃ as electrochromic layer,NiO_x as counter-electrode layer and oxymethylene-linked polyoxyethylene/LiClO₄ complex with good transparency as electrolyte.The modulation depth from 700 nm to 900 nm can exceed 50% The electrochromic ability of the window increases with increasing temperature and increasing LiClO₄ concentration,and the window exhibits good storage life of information without energy supply.

Key words: polyoxyethylene, lithium perchlorate, electrochromic window