Conductivity and NMR properties of plasticized polyethers complexed with lithium salts

M. Forsyth, M. Garcia, D. R. MacFarlane, S. Ng, M. E. Smith, J. H. Strange

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Abstract

NMR provides a tool whereby the dynamic properties of specific nuclei can be investigated. In the present study, a poly(ethylene oxide-co-propylene oxide) network has been used as the polymer host to prepare solid polymer electrolytes (SPE) containing either LiClO 4 or LiCF 3 SO 3 . In addition, a low molecular weight plasticizer [propylene carbonate (PC), dimethyl formamide (DMF) or tetraglyme] has been added to several of the samples to enhance the mobility of the polymer and, thus, of the ionic species. The effects of plasticizer and salt concentration on the ionic structure and mobility in these SPEs, as measured by NMR relaxation times, and correlation to the conductivity behaviour in these systems are discussed. Temperature dependent triflate diffusion coefficients, as measured by Pulsed Field Gradient 19 F-NMR, in plasticized SPEs are also reported.

Original languageEnglish
Pages (from-to)1365-1370
Number of pages6
JournalSolid State Ionics
Volume86-88
Issue numberPART 2
DOIs
Publication statusPublished - 1 Jan 1996

Keywords

  • Conductivity
  • Fluorine-19 NMR
  • Lithium-7 NMR
  • Plasticizers
  • Polymer electrolytes
  • Relaxation times

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