Decoupling Ionic Conductivity from Structural Relaxation: A Way to Solid Polymer Electrolytes?

Using broadband dielectric spectroscopy, we studied the temperature dependence of ionic conductivity and structural relaxation in a number of polymers. We demonstrate that temperature dependence of ionic conductivity can be decoupled from structural relaxation in a material specific way. We show tha...

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Bibliographic Details
Published in:Macromolecules 2011-06, Vol.44 (11), p.4410-4414
Main Authors: Agapov, A. L, Sokolov, A. P
Format: Article
Language:English
Subjects:
Applied sciences
DECOUPLING
DESIGN
DIELECTRIC MATERIALS
Electrical, magnetic and optical properties
ELECTROLYTES
EMPLOYMENT
Exact sciences and technology
IONIC CONDUCTIVITY
MATERIALS SCIENCE
Organic polymers
Physicochemistry of polymers
POLYMERS
Properties and characterization
RELAXATION
SPECTROSCOPY
TEMPERATURE DEPENDENCE
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Summary:Using broadband dielectric spectroscopy, we studied the temperature dependence of ionic conductivity and structural relaxation in a number of polymers. We demonstrate that temperature dependence of ionic conductivity can be decoupled from structural relaxation in a material specific way. We show that the strength of the decoupling correlates with the steepness of the temperature dependence of structural relaxation in the polymer, i.e., with its fragility. We ascribe the observed result to stronger frustration in chain packing characteristic for more fragile polymers. We speculate that employment of more fragile polymers might lead to design of polymers with higher ionic conductivity.
ISSN:0024-9297
1520-5835
DOI:10.1021/ma2001096