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Exafs and Thermal Studies of Post-Preparative Treatments of Divalent Polymer Electrolyte Films

Published online by Cambridge University Press:  28 February 2011

Roger J. Latham ,
Roger G. Linford ,
Rory Pynenburg  and
Walkiria S. Schlindwein
Roger J. Latham
Affiliation:
Department of Chemistry, Leicester Polytechnic, P.O.Box 143, Leicester LEI 9BH, U.K.
Roger G. Linford
Affiliation:
Department of Chemistry, Leicester Polytechnic, P.O.Box 143, Leicester LEI 9BH, U.K.
Rory Pynenburg
Affiliation:
Department of Chemistry, Leicester Polytechnic, P.O.Box 143, Leicester LEI 9BH, U.K.
Walkiria S. Schlindwein
Affiliation:
Department of Chemistry, Leicester Polytechnic, P.O.Box 143, Leicester LEI 9BH, U.K.
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Abstract

Taking PEOn:ZnBr2 films as benchmark systems, results are discussed for EXAFS and conductivity studies on the corresponding chloride and iodide systems, and DSC results are also compared with PEOn:NiBr2 samples. The polymer electrolyte films used in this study were cast from water. In each case attention was focused on the behaviour resulting from three different preparation/storage regimes, referred to in the text as U, D50 and D140. The high temperature drying regime D140, produces high melting crystalline complexes in all cases but the low temperature regime, D50, invokes more complicated behaviour. Nickel systems are imperfectly dried by the latter regime whereas it appears possible to dry zinc systems completely in a manner that avoids high melting complex formation. EXAFS reveals that the local structure in the zinc halide systems depends more on anion type than concentration. An interesting minimum is observed in the conductivity against composition curves for the zinc systems subjected to the low temperature drying regime; this can be explained by an ion-pair conduction mechanism.

Long term (1 year) dry storage of the benchmark system caused comparatively little change in the properties.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 210: Symposium L – Solid State Ionics II , 1990 , 273
Copyright
Copyright © Materials Research Society 1991

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References

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