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High Performance Polymers
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Article

Effect of sodium-mixed anion doping in PEO-based polymer electrolytes

Bhaskar Bhattacharya1*, R K Nagarale2, and Pramod K Singh3

1 Department of Physics, Hindustan College of Science and Technology, Farah, Mathura – 281122, India
2 Department of Chemistry and Interdisciplinary Program of Integrated Biotechnology, Sogang University, Seoul, South Korea
3 Department of Chemical and Biomolecular Engineering, Sogang University, Seoul, South Korea

* To whom correspondence should be addressed. E-mail: bhaskarmiet{at}gmail.com.


  Abstract

Three poly(ethylene oxide) based sodium ion-conducting mixed anion systems, namely. PEO: (1 – x)NaI + xNaSCN, PEO:(1 – x)NaI + xNaCH3COO, PEO:(1 – x) NaSCN + xNaCH3COO have been studied. The characteristic dip in conductivity isotherm for all the three systems was observed below and above the melting of the complex. The isolated cation transference number has also been reported by the combined a.c.–d.c. technique for all three systems. The value of tNa+ was found to be modified due to mixed anion doping. The detailed analysis of the systems under optical microscopy, differential scanning calorimetry, complex impedance spectroscopy and dielectric constant is discussed in the paper. It is shown that the mixed anion doping in polar-non polar combination of the anions is more effective in terms of changes in {sigma} and tNa+ The percentage crystallinity and dielectric constant of the medium are also correlated with the observed effect. The electrolyte dissociation model has been applied to explain the composition-dependent behavior.

First published on August 11, 2009
High Performance Polymers 2009, doi:10.1177/0954008309104931
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