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

  • Barbosa P
  • Silva M
  • Smith M
 et al. 
  • 21

    Readers

    Mendeley users who have this article in their library.
  • 36

    Citations

    Citations of this article.

Abstract

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

Get free article suggestions today

Mendeley saves you time finding and organizing research

Sign up here
Already have an account ?Sign in

Find this document

Get full text

Authors

  • Paula C. Barbosa

  • Michael J. Smith

  • Alexandra Gon??alves

  • Elvira Fortunato

  • S??lvia C. Nunes

Cite this document

Choose a citation style from the tabs below

Save time finding and organizing research with Mendeley

Sign up for free