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Lithium ion mobility in poly(vinyl alcohol) based polymer electrolytes as determined by 7Li NMR spectroscopy
journal contribution
posted on 1998-04-01, 00:00 authored by H Every, F Zhou, Maria ForsythMaria Forsyth, D MacFarlaneSolvent-free polymer electrolytes based on poly(vinyl alcohol) (PVA) and LiCF3SO3 have shown relatively high conductivities (10−8-10−4 S cm−1), with Arrhenius temperature dependence below the differential scanning calorimeter (DSC) glass transition temperature (343 K). This behaviour is in stark contrast to traditional polymer electrolytes in which the conductivity reflects VTF behaviour. 7Li nuclear magnetic resonance (NMR) spectroscopy has been employed to develop a better understanding of the conduction mechanism. Variable temperature NMR has indicated that, unlike traditional polymer electrolytes where the linewidth reaches a rigid lattice limit near Tg, the lithium linewidths show an exponential decrease with increasing temperature between 260 and 360 K. The rigid lattice limit appears to be below 260 K. Consequently, the mechanism for ion conduction appears to be decoupled from the main segmental motions of the PVA. Possible mechanisms include ion hopping, proton conduction or ionic motion assisted by secondary polymer relaxations.
History
Journal
Electrochimica actaVolume
43Issue
10-11Pagination
1465 - 1469Publisher
Elsevier Science Pub. Co.Location
New York, N.Y.Publisher DOI
ISSN
0013-4686eISSN
1873-3859Language
engPublication classification
C1.1 Refereed article in a scholarly journalCopyright notice
1998, Elsevier Science Ltd.Usage metrics
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