Triflate ion association in plasticized polymer electrolytes

Bishop, Andrea G., MacFarlane, Douglas R., McNaughton, Don and Forsyth, Maria 1996, Triflate ion association in plasticized polymer electrolytes, Solid state ionics, vol. 85, no. 1-4, pp. 129-135, doi: 10.1016/0167-2738(96)00049-5.

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Title Triflate ion association in plasticized polymer electrolytes
Author(s) Bishop, Andrea G.
MacFarlane, Douglas R.
McNaughton, Don
Forsyth, MariaORCID iD for Forsyth, Maria
Journal name Solid state ionics
Volume number 85
Issue number 1-4
Start page 129
End page 135
Publisher Elsevier
Place of publication Amsterdam, The Netherlands
Publication date 1996-05
ISSN 0167-2738
Keyword(s) FT-IR
polymer electrolytes
ion association
lithium triflate
Summary Ion association in plasticised solid polymer electrolytes (SPEs) has been monitored using FT-IR spectroscopy. The SPEs were prepared from a random co-polymer of ethylene oxide (EO) and propylene oxide (PO) and the salt lithium trifluoromethane sulfonate (lithium triflate, LiTf). Tetraethylene glycol dimethylether (tetraglyme, ε˜5) and N,N'-dimethyl formamide (DMF, ε = 36.7) were chosen as model plasticisers. Decreased ion association resulted from plasticization with DMF, indicating that the addition of a higher dielectric constant solvent increases the fraction of dissociated ions in the SPE. The incorporation of tetraglyme into these SPEs results in increased ion association, despite the similar dielectric constants of the plasticiser and polymer host. The effects of salt concentration (0.05–1.25 mol dm− 3 solvent) upon ion association in SPEs was also investigated. There appears to be a minimum in the number of “free” ions at a LiTf concentration of 0.2 mol dm− 3 solvent followed by a maximum at approximately 0.4 mol dm− 3 solvent, consistent with the molar conductivity behaviour previously observed in these electrolytes.
Language eng
DOI 10.1016/0167-2738(96)00049-5
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, Elsevier Science B.V.
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