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Polymer Aukali-Metal Polyiodides with Variable Ionic and Electronic Conductivities

Published online by Cambridge University Press:  21 February 2011

Hans-Conrad Zur Loye,
Leslie J. Lyons,
L. Charles Hardy,
James S. Tonge and
Duward F. Shriver
Hans-Conrad Zur Loye
Affiliation:
Department of Chemistry and Materials Research Center, Northwestern University, Evanston, IL 60208
Leslie J. Lyons
Affiliation:
Department of Chemistry and Materials Research Center, Northwestern University, Evanston, IL 60208
L. Charles Hardy
Affiliation:
Department of Chemistry and Materials Research Center, Northwestern University, Evanston, IL 60208
James S. Tonge
Affiliation:
Department of Chemistry and Materials Research Center, Northwestern University, Evanston, IL 60208
Duward F. Shriver
Affiliation:
Department of Chemistry and Materials Research Center, Northwestern University, Evanston, IL 60208
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Abstract

Alkali metal polyiodide complexes of polyethers, of the type (polymer)nMIx, [Polymer - poly(ethylene oxide), PEO; poly(propylene oxide), PPO; or poly-(bis(methoxyethoxyethoxy)phosphazene), MEEP, and M - Li or Na] have been prepared and characterized in order to elucidate the nature of the observed ionic and electronic conductivities. Raman spectra of the polyiodide complexes indicate that the relative concentrations of the polyiodide species (such as I3- and higher polyiodides) depend on the salt concentration in the polymer as well as on the iodine to cation ratio. The ionic conduction can best be described by a free volume (VTF) mechanism where both polymer motion and ion mobility are activated processes. The magnitude of the electronic and ionic conductivities are a function of polymer to salt ratio as well as iodine content.

Information

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 135: Symposium M – Solid State Ionics I , 1988, 325
Copyright
Copyright © Materials Research Society 1989

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