Abstract
13C and 6Li high-resolution solid-state NMR techniques are used to characterize the morphology and dynamics of LiClO 4/ poly(ethylene oxide) )(PEO) electrolytes. 13C spectra and relaxation are sensitive to the polymer morphology and the local chain motions. The 6Li magic-angle spinning (MAS) NMR technique offers a detailed quantitative structural picture of the lithium atoms. At low concentrations of LiClO 4 in PEO, where the conductivity rises with increasing concentration, the number of dissociated lithium ions is apparently the determining factor. At higher concentrations the observed drop in conductivity is associated with an increase in ion-ion interactions as well as decreased ion mobilities due to a lack of available sites on the polymer and due to decreasing polymer chain mobility. The number of dissociated lithium ions therefore is less important at these concentration.
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