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Determination of charge carrier transport parameters in a polymer electrolyte intended for Li-ion batteries using electrochemical impedance analysis

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Abstract

Solid polymer electrolytes are key components in many electrochemical devices. For an in-depth study of the basic parameters of such electrolytes, we developed a previously proposed method in order to determine the charge carrier density (n), mobility (μ), and diffusion coefficient (D) of ionic conductors using electrochemical impedance analysis. This reinforced method was tested with a composite solid electrolyte based on polyethylene oxide, ethylene carbonate, LiCF3SO3, and alumina filler by analyzing DC conductivity, frequency dependence of AC conductivity, and the complex dielectric function. The results show a clear picture of the temperature dependence of the parameters n, μ, and D; for example, at 20 °C, more than 15% of the total number of ions available in the electrolyte are mobile, and this value decreases with increasing temperature, most probably due to increased ion association in agreement with measurements using other techniques. The increase in ionic conductivity with increasing temperature is thus due to an increased mobility of the ionic species.

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Funding

Research support from the University of Peradeniya Sri Lanka, University Research Grant No. URG/2019/27IS, is gratefully acknowledged.

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Authors and Affiliations

  1. Department of Physics and Post Graduate Institute of Science, Faculty of Science, University of Peradeniya, Peradeniya, Sri Lanka

    T. M. W. J. Bandara & L. B. E. Gunasekara

  2. Department of Physics, University of West Georgia, Carrollton, GA, 3011, USA

    L. Ajith DeSilva

  3. Department of Physics, Queensborough Community College of CUNY, Bayside, NY, 11364, USA

    Sunil Dehipawala

  4. Department of Physics, Chalmers University of Technology, Gothenburg, Sweden

    B.-E. Mellander

Authors
  1. T. M. W. J. Bandara
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  2. L. Ajith DeSilva
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  3. L. B. E. Gunasekara
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  4. Sunil Dehipawala
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  5. B.-E. Mellander
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Correspondence to T. M. W. J. Bandara.

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Bandara, T.M.W.J., DeSilva, L.A., Gunasekara, L.B.E. et al. Determination of charge carrier transport parameters in a polymer electrolyte intended for Li-ion batteries using electrochemical impedance analysis. J Solid State Electrochem 24, 1207–1216 (2020). https://doi.org/10.1007/s10008-020-04604-3

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  • DOI: https://doi.org/10.1007/s10008-020-04604-3

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