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Ftir study of ion-pairing effects in plasticized polymer electrolytes
journal contribution
posted on 1995-10-01, 00:00 authored by D MacFarlane, P Meakin, A Bishop, D McNaughton, J Rosalie, Maria ForsythMaria ForsythThe effect of plasticizer on the ubiquitous ion-pairing observed in polymer electrolytes has been investigated using FTIR as a probe of the local environment of the triflate ion in sodium and lithium triflate based electrolytes. Plasticizers having a range of properties, such as, propylene carbonate, and dimethyl formamide (DMF), have been investigated in the pure state for comparison with the polymer (a random copolymer of ethylene oxide at propylene oxide (mol ratio 3: 1)). The different plasticizers exhibited strikingly different effects on the triflate ion bands normally observed in polyether salt systems. In particular, the cation associated triflate ion bands at 1288 and 1248 cm−1 and the band at 1272 cm−1 which has variously been assigned to the free ion and also to the strongly aggregated anion, are different. PC produces a rapid disappearance of the “free” ion band in favour of the monodentate ion pair. On the other hand, DMF strongly enhances the band near 1270 cm−1 at salt concentrations higher than 0.7 mol kg−1. These observations are discussed in terms of recent ab initio calculations of the triflate vibrational bands.
History
Journal
Electrochimica actaVolume
40Issue
13-14Pagination
2333 - 2337Publisher
Elsevier Science Pub. Co.Location
New York, N.Y.Publisher DOI
ISSN
0013-4686eISSN
1873-3859Language
engPublication classification
C1.1 Refereed article in a scholarly journalCopyright notice
1995, Elsevier Science Ltd.Usage metrics
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