Abstract
The positron lifetime spectra and ionic conductivity have been measured for polymeric electrolyte PEU-LiClO4 as a function of temperature in the range of 120≈360 K and as a function of Li-salt concentration at room temperature. From the temperature dependence of positron annihilation parameters, the glass transition and subtransition are observed, and the glass transition temperatureT g of pure PEU is determined to be 240 K. AboveT g, the free volume hole size dramatically increases with temperature. The variations of positron annihilation parameters and ionic conductivities with respect to Li-salt concentration at room temperature indicate that the Li salt mainly diffuses into the amorphous region in PEU-LiClO4. The increase of Li salt concentration brings about an increase in the number of carried ions, and a reduction of the fractional free volume.
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Supported by the National Natural Science Foundation of China
Wang Shaojie: born in Mar. 1942, Professor
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Shaojie, W., Bo, W., Shiqing, L. et al. Microstructure of polymeric electrolyte PEU-LiClO4 studied by positron spectroscopy. Wuhan Univ. J. Nat. Sci. 2, 171–174 (1997). https://doi.org/10.1007/BF02827825
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DOI: https://doi.org/10.1007/BF02827825