Stretching-induced changes in ion-polymer interactions in semicrystalline LiI-P(EO)n polymer electrolytes

D. Golodnitsky*, E. Livshits, Yu Rosenberg, I. Lapides, E. Peled

*Corresponding author for this work

Research output: Contribution to journalConference articlepeer-review

27 Scopus citations

Abstract

Ionic conductivity, which is the most important polymer electrolyte (PE) property, is considered to be higher in the totally amorphous matrix, and ion transport is assumed to be mediated primarily by the motion of polymer segments. Despite this conventional wisdom, we suggest that fast ion transport occurs preferentially along the PEO helical axis, at least in the crystalline phase. In this work, we have studied the effect of hot and room-temperature stretching on the structural properties, ion-polymer interactions and ionic conductivity in dilute and concentrated LiI:P(EO)n (3 ≤ n ≤ 100) PEs. SEM and XRD data show evidence of the formation of a more oriented polymer-electrolyte structure. Significant changes in the FTIR spectra of the diluted LiI:P(EO)n electrolytes are found for the skeletal vibration mode of the C-O-C groups. The effect of stretching on the FTIR spectra of concentrated PEs was found to be less pronounced than that of the dilute PEs. The stretching process was found to influence the conductivity in the direction of the force more strongly than does an increase in temperature.

Original languageEnglish
Pages (from-to)265-273
Number of pages9
JournalSolid State Ionics
Volume147
Issue number3-4
DOIs
StatePublished - Apr 2002
Event2001 Polymer Electronic Sympoiusm (PES2001) - Noorderwijkerhout, Netherlands
Duration: 14 May 200116 May 2001

Funding

FundersFunder number
Israel Academy of Science

    Keywords

    • Ionic conductivity
    • Polymer electrolyte
    • Stretching

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