Di-ureasil xerogels containing lithium bis(trifluoromethanesulfonyl)imide for application in solid-state electrochromic devices

  • Barbosa P
  • Silva M
  • Smith M
 et al. 
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In this study we report the characterization of a prototype solid-state electrochromic device based on poly(ethylene oxide) (PEO)/siloxane hybrid networks doped with lithium bis(trifluoromethanesulfonyl)imide (LiTFSI). The polymer networks prepared, designated as di-ureasils and represented as d-U(2000), were produced by a sol-gel procedure and are composed of a siliceous framework to which both ends of polyether chains containing about 40 {single bond}CH2CH2O{single bond} units are covalently bonded through urea linkages. Samples with compositions of 200 ??? n ??? 0.5 (where n is the molar ratio of {single bond}CH2CH2O{single bond} to Li+) were characterized by thermal analysis, complex impedance measurements and cyclic voltammetry at a gold microelectrode. Electrolyte samples were obtained as self-supporting, transparent, amorphous films and at room temperature the highest conductivity was observed with the d-U(2000)35LiTFSI composition (3.2 ?? 10-5 ??-1 cm-1). We report the results of preliminary evaluation of these polymer electrolytes as multi-functional components in prototype electrochromic displays. Device performance parameters such as coloration efficiency, optical contrast and image stability were also evaluated. The electrolytes with n > 8 presented an optical density above 0.56 and display assemblies exhibited good open-circuit memory and stable electrochromic performances. ?? 2008 Elsevier Ltd. All rights reserved.

Author-supplied keywords

  • All-solid-state electrochromic displays
  • Di-ureasils
  • Organic-inorganic hybrid networks
  • Sol-gel
  • Solid polymer electrolytes

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