An nmr investigation of ionic structure and mobility in plasticized solid polymer electrolytes

M. Forsyth, D. R. MacFarlane, P. Meakin, M. E. Smith, T. J. Bastow

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Abstract

23 Na and 19 F nuclear magnetic resonance spectroscopy is used to investigate the effect of plasticizer addition on ionic structure and mobility in a urethane crosslinked polyether solid polymer electrolyte. The incorporation of dimethyl formamide and propylene carbonate plasticizers in a sodium triflate/polyether system results in an upfield chemical shift for the 23 Na resonance consistent with decreased anion-cation association and increased cation-plasticizer interactions. The 19 F resonances appears less susceptible to changes in chemical environment with only minor chemical shift changes recorded. Spin lattice relaxation measurements for the 19 F nucleus are also reported. Two minima are observed in the relaxation measurements consistent with both an inter and intramolecular relaxation mechanism.

Original languageEnglish
Pages (from-to)2343-2347
Number of pages5
JournalElectrochimica Acta
Volume40
Issue number13-14
DOIs
Publication statusPublished - 1 Jan 1995

Keywords

  • fluorine-19
  • nuclear magnetic resonance
  • plasticized polymer electrolytes
  • sodium-23

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