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FT-IR investigation of Ion association in plasticized solid polymer electrolytes

Bishop, Andrea G., MacFarlane, Douglas R., McNaughton, Don and Forsyth, Maria 1996, FT-IR investigation of Ion association in plasticized solid polymer electrolytes, Journal of physical chemistry B : condensed matter, materials, surfaces, interfaces and biophysical, vol. 100, no. 6, pp. 2237-2243.

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Title FT-IR investigation of Ion association in plasticized solid polymer electrolytes
Author(s) Bishop, Andrea G.
MacFarlane, Douglas R.
McNaughton, Don
Forsyth, Maria
Journal name Journal of physical chemistry B : condensed matter, materials, surfaces, interfaces and biophysical
Volume number 100
Issue number 6
Start page 2237
End page 2243
Publisher American Chemical Society
Place of publication Washington, D.C.
Publication date 1996-02-08
ISSN 1520-6106
1520-5207
Summary FT-IR spectroscopy has been utilized to monitor ion association in plasticized solid polymer electrolytes (SPEs). The SPEs were prepared from a random copolymer of ethylene oxide (EO) and propylene oxide (PO) and the salt lithium trifluoromethanesulfonate (lithium triflate, LiTf). Tetraethylene glycol dimethyl ether (tetraglyme) and N,N‘-dimethylformamide (DMF) were chosen as model plasticizers. Despite having a similar dielectric constant to that of the polymer host, ε ~ 5, the incorporation of tetraglyme into the SPEs resulted in increased ion association. The addition of a higher dielectric constant solvent , DMF, ε = 36.7, resulted in decreased ion association in the SPE. The effects of salt concentration (0.05−1.25 mol dm-3) and temperature (25−100 °C) upon ion association in SPEs were also investigated. At low salt concentrations, ion association was found to increase with temperature, however, at 1.25 mol dm-3 the temperature dependence of ion association was dominated by concentration effects. There appears to be a maximum in the fraction of “free” ions at a LiCF3SO3 concentration of 0.4 mol dm-3, preceded by a minimum at approximately 0.2 mol dm-3, consistent with the molar conductivity behavior previously observed in these electrolytes.
Language eng
Field of Research 039999 Chemical Sciences not elsewhere classified
Socio Economic Objective 970103 Expanding Knowledge in the Chemical Sciences
HERDC Research category C1.1 Refereed article in a scholarly journal
Copyright notice ©1996, American Chemical Society
Persistent URL http://hdl.handle.net/10536/DRO/DU:30030073

Document type: Journal Article
Collection: Institute for Technology Research and Innovation
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