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Ionic conductivity and 7Li NMR Study of Poly(ethylene glycol) complexed with lithium salts

✍ Scribed by S. Panero; B. Scrosati; S.G. Greenbaum

Publisher
Elsevier Science
Year
1992
Tongue
English
Weight
491 KB
Volume
37
Category
Article
ISSN
0013-4686

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✦ Synopsis

Complexes formed between lithium salts and low molecular weight (0.5 kgmol-') poly(ethylene glycol) have been investigated by differential scanning calorimetry, 'Li nuclear magnetic resonance (NMR), and complex impedance measurements. 'Li NMR linewidths and hence ionic mobilities are strongly influenced by polymer segmental motion above the glass transition. Strong cation-anion interactions in LiBF, complexes are evidenced by substantial ' Li-19 F dipolar coupling. Ionic conductivity results are similar to those reported for widely studied poly(ethylene oxide) complexes, in that broad conductivity us salt concentration maxima are found. Finally, addition of up to 30 wt% of the inert ceramic powder y-LiAlO,, while improving the mechanical properties of the samples, is found to have a negligible effect on ionic conductivity.

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