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Impedance spectroscopy on polymer electrolytes containing Lithium and Magnesium ions
Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Solid State Physics. Chalmers University of Technology.
Chalmers University of Technology.
Chalmers University of Technology.
Chalmers University of Technology.
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2006 (English)Conference paper, Poster (Other academic)
Abstract [en]

A detailed impedance spectroscopy study, together with thermal analysis, was carried out on polymer electrolytes composed of low molecular weight poly(ethylene oxide) 400 with added lithium or magnesium triflate salts. Glass transition temperatures were always far below room temperature. The ion conductivity exhibits a maximum at intermediate salt concentrations and is significantly higher in the case of Li triflate addition. When the ion conductivity contribution was subtracted, a prominent dielectric loss peak in the MHz region was observed. Its relaxation strength scales with ion concentration, as appropriate for an ion pair relaxation in systems above the glass transition. We present evidence that this relaxation is due to the same species that give rise to the ion conductivity. The complex impedance due to the composite ion conductivity – ion pair relaxation process was found to exhibit good agreement with the Davidson-Cole [D.V. Davidson and R.H. Cole, J. Chem. Phys., 19 (1951) 1484-1490] relaxation function. The relaxation process is characterized by a power-law exponent below 0.5, which signifies an anomalous diffusion process at high frequencies crossing over to a constant conductivity at low frequencies.

Place, publisher, year, edition, pages
2006. 256-257 p.
National Category
Condensed Matter Physics
Research subject
Engineering Science with specialization in Solid State Physics
Identifiers
URN: urn:nbn:se:uu:diva-319630OAI: oai:DiVA.org:uu-319630DiVA: diva2:1087306
Conference
4th Conf. Intern. Dielectric Soc. and 9th Intern. Conf. Dielectric and Related Phenomena, Poznan, Poland 3-7 Sept., 2006 (Lodz, 2006)
Available from: 2017-04-06 Created: 2017-04-06 Last updated: 2017-04-10Bibliographically approved

Open Access in DiVA

fulltext(133 kB)38 downloads
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Niklasson, Gunnar A.
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