A vibrational spectroscopic study of lithium triflate in polyphosphazenes with linear oligoethyleneoxy side-chains of different lengths

S. York, E. C. Kellam, H. R. Allcock, R. Frech

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Abstract

A comparative vibrational spectroscopy study is reported for a series of polymer electrolytes composed of poly(oligoethyleneoxy phosphazenes) containing dissolved lithium triflate. These polymers, of the form [NP((OCH2CH2)x OCH3)2]n, with x = 0, 1, 2, or 5, have been mixed with LiCF3SO3 in oxygen:lithium concentration ratios ranging from 10:1 to 40:1. Raman vibrational spectroscopy has been used to examine ionic association and local changes of the polymer as the salt concentration and the length of the ethylene oxide side-chains vary. The degree of ionic association of the triflate ion increases with increasing salt concentration. At a given salt concentration, the degree of ionic association and the nature of the ion-polymer interaction are dependent on the length of the side-chains.

Original languageEnglish (US)
Pages (from-to)1553-1557
Number of pages5
JournalElectrochimica Acta
Volume46
Issue number10-11
DOIs
StatePublished - Mar 15 2001

All Science Journal Classification (ASJC) codes

  • Chemical Engineering(all)
  • Electrochemistry

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