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TitleStructure, thermal properties, conductivity and electrochemical stability of di-urethanesil hybrids doped with LiCF3SO3
Author(s)Gonçalves, M. C.
Zea Bermudez, V. de
Silva, Maria Manuela
Smith, Michael John
Morales, Enrique
Ferreira, R. A. Sá
Carlos, L. D.
Llthium triflate
Thermal analysis
Complex impedance spectroscopy
Cyclic voltammetry
Electrochromic devices
Lithium triflate
Complex impedance
Issue dateApr-2010
Citation"Ionics". ISSN 1862-0760. 16:3 (Apr. 2010 ) 193-201.
Abstract(s)Variable chain length di-urethane cross-linked poly(oxyethylene) (POE)/siloxane hybrid networks were prepared by application of a sol-gel strategy. These materials, designated as di-urethanesils (represented as d-Ut(Y’), where Y’ indicates the average molecular weight of the polymer segment), were doped with lithium triflate (LiCF3SO3). The two host hybrid matrices used, d-Ut(300) and d-Ut(600), incorporate POE chains with approximately 6 and 13 (OCH2CH2) repeat units, respectively. All the samples studied, with compositions ∞ > n ≥ 1 (where n is the molar ratio of (OCH2CH2) repeat units per Li+),, are entirely amorphous. The di-urethanesils are thermally stable up to at least 200 ºC. At room temperature the conductivity maxima of the d-Ut(300)- and d-Ut(600)-based di-urethanesil families are located at n = 1 (approximately 2.0x10-6 and 7.4x10-5 Scm-1, respectively). At about 100 ºC, both these samples also exhibit the highest conductivity of the two electrolyte systems (approximately 1.6x10-4 and 1.0x10-3 Scm-1, respectively). The d-Ut(600)-based xerogel with n = 1 displays excellent redox stability.
AccessOpen access
Appears in Collections:CDQuim - Artigos (Papers)

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