Polymer electrolytes for electrochromic window applications

Polymer electrolytes suitable for use in electrochromic window devices for architectural applications have been developed. The electrolyte properties required for a large area, long lifetime, long cycle life and wide temperature range application such as this place some restrictions on the type of polymer system required. The electrolytes developed in this work are based on LiClO₄ in a polyether copolymer which is cured in place to produce a clear elastomer. The material properties and conductivity of electrolytes with and without the plasticizers are presented. Electrochromic device performance tests show that the electrolyte impedance is a factor in the device performance, but not the limiting factor.