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Ion dynamics and relaxation behavior of NaPF6-doped polymer electrolyte systems

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Abstract

The present paper discusses the ion dynamics of a novel polymeric system prepared by doping of NaPF6 in a lab-prepared polymer matrix. Ion dynamics of the system is analyzed by presenting the impedance data in different formalisms. Mobility (and hence the conductivity) continuously increases with salt concentration, and the phenomenon is correlated with salt’s plasticization nature, which is reconfirmed by the shifting of minima in ∂logε′/∂logω vs. logω curve towards high frequency. It has been observed that number of charge carriers (N′) estimated from conductivity data do not represent the real charge concentration in the system. Within the experimental frequency (∼MHz) range, three different regions are identified in ∂logσ vs. ∂logω curves namely (i) dc conductivity/free hopping, (ii) correlated ion hopping, and (iii) caged movement of ions. In the present case, also a scaled master conductivity curve is obtained by estimating the σ 0 and ω p (exclusively in Jonscher Power Law or JPL region) according to our previously proposed method. Scaling is realized with respect to salt concentration and temperature, which is an indication that salt concentration and temperature are only governing the number of charge carriers and mobility without affecting the underlying ion transport mechanism. Non-Debye-type relaxation phenomenon is indicated by KWW exponent β (<1). Relaxation times, obtained from tanδ vs. logω curves, inversely follow the conductivity, indicating strongly correlated ion-polymer segmental motions.

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Acknowledgments

The authors are grateful to the DST, New Delhi, for research project SR/S2/CMP00652007/dated 8.4.2008, whose instruments are used in the present study. One of the authors (MK) is thankful to the UGC, New Delhi, India, for the award of Rajiv Gandhi National-Senior Research Fellowship.

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Authors and Affiliations

  1. Department of Physics (MMV), Banaras Hindu University, Varanasi, 221005, India

    Neelam Srivastava & Manindra Kumar

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  1. Neelam Srivastava
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  2. Manindra Kumar
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Correspondence to Neelam Srivastava.

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Neelam Srivastava and Manindra Kumar equally contributed to this work.

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Srivastava, N., Kumar, M. Ion dynamics and relaxation behavior of NaPF6-doped polymer electrolyte systems. J Solid State Electrochem 20, 1421–1428 (2016). https://doi.org/10.1007/s10008-016-3147-1

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  • DOI: https://doi.org/10.1007/s10008-016-3147-1

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