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Polymer Electrolytes: Hopping, Domain Structures and Frequency-Dependent Conductivity

Published online by Cambridge University Press:  28 February 2011

Mark A. Ratner and
A. Nitzan
Mark A. Ratner
Affiliation:
Department of Chemistry and Materials Research Center, Northwestern University, Evanston, Illinois 60208
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Abstract

The dynamic bond percolation model was developed to deal with dynamic disorder, treating ion mobility by a percolation model in which the assignment of any site-to-site jump as allowed or forbidden changes on a timescale related to the local reorganizational dynamics of the polymer segments (the renewal time). Here we discuss the special cases of highfrequency spectra and partially crystalline electrolytes. At high frequencies, the present hopping model yields unphysical behavior (frequencyindependent response); we trace this back to the incorrect treatment of short-time dynamics, and show how it can be corrected. For partially crystalline materials, we show that a rollover feature in the spectrum, in the microwave range, can be expected when ions are trapped in isolated regions of high conductivity, such as amorphous pockets in largely crystalline PEO.

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Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 210: Symposium L – Solid State Ionics II , 1990, 109
Copyright
Copyright © Materials Research Society 1991

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