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Urea-assisted ion-transport behavior in magnesium ion conducting solid polymer electrolyte membranes intended for magnesium batteries

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Abstract

In this paper, performance enhancement of magnesium ion conducting solid polymer electrolyte has been investigated with the incorporation of urea in it. The standard solution casting technique has been adopted to fabricate solid polymer electrolyte consisting of poly(ethylene oxide) (PEO) polymer, magnesium triflate (MgTf2) salt and urea. Measurement on conductivity, dielectric and modulus is carried out on the electrolyte films as a function of frequency at various temperatures. On the introduction of urea in PEO/MgTf2 matrix, the ionic conductivity improves by an order of magnitude and the relaxation time decreases from 0.45 to 0.16 µs. The highest conductivity of 6.3 × 10–5 S cm−1 has been recorded for PEO/MgTf2/Urea polymer electrolyte system. The ionic conductivity versus temperature plots suggests the Arrhenius behavior within the electrolyte compositions. The number density of the free ions increases by an order of magnitude from 1020 to 1021 on the addition of urea in PEO/MgTf2 matrix without any significant change in mobility values. The conductivity, dielectrics, surface morphology and X-ray diffraction studies reveal that urea is not only improving the porous structure but also interacting with the PEO/MgTf2 matrix to improve the ion dynamics. This approach toward improved ion-transport behavior may be utilized in fabricating high-performance electrolytes, especially for magnesium batteries.

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Acknowledgements

Deepak Kumar thanks and acknowledges ‘‘The M.S. University of Baroda’’ Vadodara, Gujarat, India. The encouragement from Electronics and Mechanical Engineering School, Affiliated to Gujarat Technological University, Government of India is gratefully acknowledged. Authors thanks and acknowledge Scientist R. Venkatesh, UGC-DAE consortium, Indore, India for Atomic Force Microscopic characterization. Kuldeep Mishra acknowledges the funding (File No. YSS/2015/001234) from Science and Engineering Research Board (SERB) New Delhi, India.

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Correspondence to Deepak Kumar.

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Mishra, K., Kanchan, D.K., Gohel, K. et al. Urea-assisted ion-transport behavior in magnesium ion conducting solid polymer electrolyte membranes intended for magnesium batteries. Chem. Pap. 76, 827–839 (2022). https://doi.org/10.1007/s11696-021-01910-6

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  • DOI: https://doi.org/10.1007/s11696-021-01910-6

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