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Role of mixed molecular weight PEO-PVDF polymers in improving the ionic conductivity of blended solid polymer electrolytes

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Abstract

Blended solid polymer electrolytes (BSPE) were prepared by mixing different molecular weight polymers PEO6 (Mw = 1 × 106 g/mol), PEO5 (Mw = 1 × 105 g/mol), and PVDF (Mw = 5.25 × 105 g/mol) complexed with lithium salt. Conductivity and dielectric studies at different temperatures were carried out on these BSPE systems by varying the wt% of PEO5 and PVDF with respect to PEO6, keeping the wt% of lithium salt constant. The electrical characterizations of BSPE systems have been investigated using impedance spectroscopy in the frequency range 0.1–106 Hz. The conductivity data shows that inclusion of PEO5 and PVDF into the PEO6 matrix improved the overall lithium-ion dynamics in the polymer matrix. The composition, PEO6 (94 wt%)-PEO5 (3 wt%)/PVDF (3 wt%)-LiClO4, exhibited maximum conductivity of 6.44 × 10−4 Scm−1 at 303 K. The DC conductivity variation with temperature of BSPE systems follows Arrhenius relation and variation of AC conductivities with frequency obeys Jonscher’s power law. The real and imaginary part of dielectric constant and the dielectric relaxation were also investigated.

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Acknowledgements

The author C. Revathy sincerely thanks PES University and Department of Science & Humanities (Physics) where the present research work was carried out.

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Authors and Affiliations

  1. Department of Electrical & Electronics Engineering, PES University, -560085, Bangalore, Karnataka, India

    C Revathy & Rex Joseph

  2. Department of Sciences and Humanities, School of Engineering and Technology, Christ (Deemed to be University), -560074, Bangalore, Karnataka, India

    V R Sunitha & Benson K. Money

  3. Department of Science and Humanities, PES University, -560085, Bangalore, Karnataka, India

    S. Radhakrishnan

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Contributions

Conceptualization and methodology: Sunitha V R. Formal analysis and investigation: Sunitha V R, S. Radhakrishnan, and Rex Joseph. Material preparation and data collection: C Revathy. Data analysis: C Revathy, Sunitha V R, and Benson K Money. Original draft preparation: C Revathy. Review and editing: Sunitha V R, Benson K Money, and S. Radhakrishnan. Supervision: S. Radhakrishnan and Sunitha V R. All authors read and approved the final manuscript.

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Revathy, C., Sunitha, V.R., Money, B.K. et al. Role of mixed molecular weight PEO-PVDF polymers in improving the ionic conductivity of blended solid polymer electrolytes. Ionics 29, 4025–4035 (2023). https://doi.org/10.1007/s11581-023-05141-5

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