Abstract: The ionic conductivity, conduction mechanism and application to electrochromic Smart windows of polymeric gel electrolyte LiClO₄ propylene carbonate polymethyl methacrylate(LiClO₄ PC PMMA)have been investigated. The ionic conductivity as a function of temperature followed the empirical Vogel Tammann Fulcher equation and depended on the weight content and T_g of PMMA, and concentration of LiClO₄. The electrolyte had a good adhesivity, good transparency and high ionic conductivity at room temperature(σ=8.75×10^-4 S/cm), when concentration of LiClO₄ was 0.5 mol/L and weight percentage of PMMA was 35%. The assembled electrochromic Smart window had good spectral behavour, at 633.3 nm its optical modulation was 40%～60%. Its optical switching time only 5 s.

Key words: polymeric gel electrolyte, LiClO₄-propylene carbonate-polymethyl methacrylate, electrochromic Smart window, ionic conductivity, spectral behavior, optical switching characteristics