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Raman Study of Free Volume Effects on Ion Pairs in Polymer Electrolytes

Published online by Cambridge University Press:  28 February 2011

L. M. Torell ,
S. Schantz  and
P. Jacobson
L. M. Torell
Affiliation:
Chalmers University of Technology Dept. of Physics, S-412 96 Gothenburg, Sweden
S. Schantz
Affiliation:
Chalmers University of Technology Dept. of Physics, S-412 96 Gothenburg, Sweden
P. Jacobson
Affiliation:
Chalmers University of Technology Dept. of Physics, S-412 96 Gothenburg, Sweden
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Abstract

Ion associations are demonstrated from Raman spectra of the anion symmetric stretch in NaCF3SO3 and LiCF3SO3 containing salt polymer complexes based on PPO and siloxane modified PPO. The observation of increasing amount of ion pairs with increasing molecular weight and temperature can be explained by an entropically driven process. The entropy effect includes contributions from several factors related to transient cross-linking via the cations, conformational entropy of the polymer chains, and free volume dissimilarities between the solvated ions and the macromolecules.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 210: Symposium L – Solid State Ionics II , 1990 , 221
Copyright
Copyright © Materials Research Society 1991

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