Conductivity and dielectric constant of PPO and PPO-based solid electrolytes from Dc to 6 GHz

Andrew L. Tipton, Mark C. Lonergan*, Mark A. Ratner, Duward F. Shriver, Thomas T Y Wong, Keli Han

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

37 Scopus citations

Abstract

The conductivity and dielectric response of poly(propylene oxide) (PPO) and the polymeric solid electrolytes (PPO)8NH4CF3SO3, (PPO)16NaI, (PPO)8NaI, and (PPO)8NaI were studied in the frequency range from dc to 6 GHz and the temperature range from 173 to 323 K with the objective of elucidating the dynamic factors that affect ion transport in polyether electrolytes. The temperature dependencies of the primary α-relaxation of PPO and the dc electrical conductivity of the salt complexes are consistent with this relaxation playing a key role in ionic conduction in polymer electrolytes. For the salt complexes, the α-relaxation appears to be shifted to lower frequencies relative to pure PPO, and this is attributed to virtual cross-linking. High-frequency room temperature measurements permit for direct comparison of the dielectric properties of (PPO)8NH4CF3SO3 with a supercooled amorphous (PEO)8NH4CF3SO3 complex. A dissimilarity between optical dielectric constants and those measured at approximately 3 GHz for the salt complexes suggests the presence of a high-frequency ionic relaxation as predicted by the dynamic bond percolation model. The relative influence of segmental mobility and ion-ion interactions on the dc conductivity of polymer salt complexes is discussed.

Original languageEnglish (US)
Pages (from-to)4148-4154
Number of pages7
JournalJournal of Physical Chemistry
Volume98
Issue number15
DOIs
StatePublished - Jan 1 1994

ASJC Scopus subject areas

  • Engineering(all)
  • Physical and Theoretical Chemistry

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