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Cationic and anionic environments in LiTFSI-doped di-ureasils with application in solid-state electrochromic devices

S. C. Nunes ; V. D. Bermudez ; Denis Ostrovskii (Institutionen för teknisk fysik, Kondenserade materiens fysik) ; P. C. Barbosa ; M. M. Silva ; M. J. Smith
Chemical Physics (0301-0104). Vol. 345 (2008), 1, p. 32-40.
[Artikel, refereegranskad vetenskaplig]

Fourier Transform mid-infrared and Raman spectroscopies were used to investigate the cation/polymer, cation/urea bridge, cation/anion and hydrogen bonding interactions in poly(oxyethylene) (POE)/siloxane di-ureasil networks prepared by the sol-gel route and doped with lithium bis(trifluoromethanesulfonyl)imide (LiTFSI). Materials with compositions 200 >= n >= 5 (where n expresses the molar ratio OCH2CH2/Li+) were studied. The Li+ ions coordinate to the urea carbonyl oxygen atoms over the whole range of salt concentration considered. Bonding to the ether oxygen atoms of the POE chains occurs at n <= 40, although a significant fraction of the POE chains remain non-coordinated. In these high salt content samples, the cations interact with the anions forming contact ion pairs. "Free" ions are probably the main charge carriers at the room temperature conductivity maximum of these ormolytes. (C) 2008 Elsevier B.V. All rights reserved.

Nyckelord: di-ureasils, LiTFSI, sol-gel, FT-IR, FT-Raman spectroscopy, POLY(ETHYLENE OXIDE), INFRARED TEMPERATURE, LITHIUM PERCHLORATE, POLYMER ELECTROLYTE, PHYSICAL-PROPERTIES, RAMAN-SPECTRA, COMPLEXES, OXIDATION, ORMOLYTES, LIQUID



Denna post skapades 2009-10-27. Senast ändrad 2016-07-19.
CPL Pubid: 100851

 

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Institutioner (Chalmers)

Institutionen för teknisk fysik, Kondenserade materiens fysik (1900-2015)

Ämnesområden

Teknisk fysik

Chalmers infrastruktur