Abstract
The origin of the ionic conductivity enhancement in polymerelectrolytes that occurs on adding inorganic oxide powders wasexplored by 1H and 7Li nuclear magnetic resonance. Ionicand molecular self-diffusion coefficients determined by pulsed fieldgradient spin-echo measurements demonstrate that lithium ionicdiffusivity is enhanced in the composites, but this enhancement isnot attributed to polymer segmental mobility. Two different systemswere investigated: a high-molecular-mass poly(ethyleneoxide)-LiClO4 complex with nanoscale TiO2; and alow-molecular-mass poly(ethylene glycol)-LiClO4 solution withAl2O3. In the latter case the effect of varying thealumina surface acidity or basicity was considered.
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