A gel-state electrolyte was prepared by controlling the proportion of [EMIM]TF2N in the electrolyte.The conductivity of the electrochromic ion gel was characterized by electrochemical devices.The optimized volume ratios of PC∶[EMIM]TF2N was 1∶3,which resulted in highest conductivity.Electrochromic thin film,based on ethyl viologen,was integrated with gel-state electrolyte,which was further assembled into electrochromic devices.The result shown that the electrochromic devices presented excellent electrochromic properties at the volume ratios of PC∶[EMIM]TF2N = 1∶3.Light modulation range up to 61%,The coloring time and fading time were 26s and 35s respectively,The coloration efficiency was 180.5cm2/C.
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