Uniaxial stress effects in poly(ethylene oxide)-LiI polymer electrolyte film - A Li-7 nuclear magnetic resonance study

Nuclear magnetic resonance (NMR) measurements have been used as a microscop ic probe of the static and dynamic behavior of unstretched and stretched fi lms of poly(ethylene oxide)-LiI complexes. The stretched sample was previou sly reported to exhibit a fivefold increase in the ionic conductivity at am bient temperatures. The NMR data indicate that the origin of this enhanceme nt is likely due to changes in the short and long-range structure which pro mote ion transport through the helical poly(ethylene oxide) structure. Stro ng support for this comes from the unexpected observation of an anticorrela tion between polymer segmental motion and ionic conductivity enhancement. ( C) 1999 The Electrochemical Society. S1099-0062(99)05-101-9. All rights res erved.