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 Ω-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.
CITATION STYLE
Barbosa, P. C., Silva, M. M., Smith, M. J., Gonçalves, A., Fortunato, E., Nunes, S. C., & de Zea Bermudez, V. (2009). Di-ureasil xerogels containing lithium bis(trifluoromethanesulfonyl)imide for application in solid-state electrochromic devices. Electrochimica Acta, 54(3), 1002–1009. https://doi.org/10.1016/j.electacta.2008.08.023
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