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Comparative investigations on polymer gel electrolytes comprising triflate salts of Li, Na, Mg in TEGDME solvent and PVdF-HFP/PVP blend matrix

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Abstract

This paper reports the comparative studies on polymer gel electrolytes (PGEs) comprising liquid electrolytes of the triflate salts of Li, Na, and Mg in tetraethylene glycol dimethyl ether (TEGDME) solvent and poly(vinylidene fluoride-hexafluoropropylene) and poly(vinylpyrroliddone), i.e., PVdF(HFP)/PVP polymer blend matrix. The effect of different cations is investigated using various structural, thermal, and electrochemical techniques. The ionic conductivity and the ion-transport behavior are investigated using electrochemical impedance spectroscopy (EIS) over wide range of frequency. The XRD studies indicate the prominent structural variation after the immobilization of Li, Na, and Mg triflate salts in the PVdF(HFP)/PVP/TEGDME matrix. The Li+ ion conducting PGE composition displays the maximum room temperature ionic conductivity of ~ 6.5 × 10−3 S cm−1. Further, it exhibits a high dielectric constant value and superior ion-dynamics as compared to Na+ and Mg2+ based electrolytes. The PGEs display translational ion-dynamics and conductivity relaxation clubbed with polarizing effects and long-range mobility/migration of the cations (Na+, Mg2+, Li+). The morphological and structural studies reveal that Li+ ion conducting PGE offers a porous structure with smooth surface facilitating faster ionic motion. The PGEs possess considerable electrochemical stability window (≥ 4.0 V) and thermal stability, which prove them worthy for developing ion-batteries, super-capacitors and other next-generation electrochemical devices.

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Acknowledgements

The authors warmly credit the Electronics and Mechanical Engineering School, Ministry of Defence, Government of India. Authors also thank Dr. Neeladri Das, Department of Chemistry, IIT Patna, India for his support in structural investigations.

Funding

Dr. Deepak Kumar gratefully acknowledges financial support from the Science and Engineering Research Board, Government of India under Core Research Grant (CRG) Scheme vide File No. CRG/2022/008719.

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Authors and Affiliations

  1. Gujarat Technological University, Ahmedabad, Gujarat, 382424, India

    Rajkumar Singh & Deepak Kumar

  2. Symbiosis Institute of Technology (SIT), Symbiosis International (Deemed University) (SIU), Pune, 412115, India

    Kuldeep Mishra

  3. ITM(SLS), Baroda University, Paldi, Vadodara, Gujarat, 391510, India

    D. K. Kanchan

  4. Regional Institute of Education Mysuru, National Council of Educational Research and Training (NCERT), Mysuru, Karnataka, 570006, India

    Deepak Kumar

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Rajkumar Singh: Investigation, writing–original draft; Kuldeep Mishra: Investigation, writing and editing; D.K.  Kanchan: Investigation; Deepak Kumar: Investigation, writing and editing.

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Singh, R., Mishra, K., Kanchan, D.K. et al. Comparative investigations on polymer gel electrolytes comprising triflate salts of Li, Na, Mg in TEGDME solvent and PVdF-HFP/PVP blend matrix. Ionics (2024). https://doi.org/10.1007/s11581-024-05557-7

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