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Fabrication of high-performance symmetrical supercapacitor using lithium iodide-based biopolymer electrolyte

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Abstract

Lithium iodide-incorporated solid polymer electrolyte has been developed by using the optimized blend of iota carrageenan and acacia gum with ethylene glycol as a plasticizer using the solution cast technique. Structural studies have been done by using X-ray diffraction (XRD) and Fourier transform infrared spectroscopy (FTIR) analysis. The thermal stability of the polymer blend electrolytes is analyzed by using differential scanning calorimetry (DSC). The conductivity of the blend electrolytes was measured by using an impedance analyzer. Among them, the one with 15 wt% LiI incorporated polymer electrolyte (referred to as IAI15) exhibits the higher conductivity as 1.21 × 10−3 S cm−1. It also has a low activation energy of 0.05 eV and a high ionic transport number of 0.999. The frequency dependence of the dielectric parameters and the dielectric loss tangent are used to confirm the non-Debye property of the prepared polymer electrolytes. Furthermore, the specific electrolyte (IAI15) is utilized in the fabrication of a symmetric capacitor. Remarkably, the cyclic voltammetry (CV) response shows no redox peaks across its entire potential range, indicating electric double-layer capacitor (EDLC) behavior. Through galvanostatic charge/discharge (GCD) studies on a prepared symmetrical capacitor, discharge time and specific capacitance (Cs) values are determined as 30 s and 150 F/g, respectively.

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Data availability

The datasets used and/or analyzed during the current study are available from the corresponding author on reasonable request.

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Acknowledgements

We gratefully acknowledge the International Research Centre (IRC), Kalasalingam Academy of Research and Education, for providing facilities and equipment to carry out the research.

Funding

Ms. M. Nandhinilakshmi has received the technical and financial support from Kalasalingam Academy of Research and Education.

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Authors and Affiliations

  1. Multi-Functional Materials Laboratory, International Research Center, Kalasalingam Academy of Research and Education, Krishnankoil, 626 126, Srivilliputhur, Tamil Nadu, India

    M. Nandhinilakshmi & P. Saranya

  2. Department of Physics, Kalasalingam Academy of Research and Education, Krishnankoil, 626 126, Srivilliputhur, Tamil Nadu, India

    D. Vanitha

  3. Department of Physics, Dayananda Sagar Academy of Technology and Management, Bangalore, 560082, Karnataka, India

    N. Nallamuthu

  4. Department of Physics, Arulmigu Kalasalingam College of Arts and Science, Krishnankoil, Srivilliputhur, 626 126, Tamil Nadu, India

    K. Sundaramahalingam

  5. Department of Science and Humanities, Karpagam Academy of Higher Education, Coimbatore, 641021, Tamil Nadu, India

    Shameem A

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All authors contributed to the study’s conception and design. Material preparation, data collection, and analyses were performed by M. N. The first draft of the manuscript was written by Dr. D. V., and all authors commented on previous versions of the manuscript. All authors read and approved the final manuscript.

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Nandhinilakshmi, M., Vanitha, D., Nallamuthu, N. et al. Fabrication of high-performance symmetrical supercapacitor using lithium iodide-based biopolymer electrolyte. Ionics 30, 1031–1049 (2024). https://doi.org/10.1007/s11581-023-05270-x

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