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Solid electrolyte membranes with Al2O3 nanofiller for fully solid-state Li-ion cells

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Abstract

Fully solid-state lithium-ion cells have the benefits of excellent safety, remarkable electrochemical stability, and extended cycle life. They are categorized as prospective candidates for new-generation energy storage devices capable of safe and stable operation for relatively long periods. In whole solid-state Li-ion cells, polymer-based solid electrolyte membranes (SEMs) are expected to serve as both the solid electrolyte and the partition material. Remarkably high ionic conductivity and efficient ion diffusion can be achieved in SEMs by incorporating inorganic filler materials. In the present work, solid electrolyte membranes are developed by a simple solution cast method. The addition of Al2O3 nanoparticles is found to enhance the ionic conductivity of SE membranes to 1.25 × 10−4 S cm−1 for optimum concentrations of lithium salt and filler material. These SE membranes show relatively high electrochemical stability window up to 4.75 V. Transparent and freestanding SE membranes developed using PEO-PVDF-LiNO3-Al2O3 have excellent thermal stability, ideal ion transport number, and good electrochemical properties, suitable for applications in solid-state lithium-ion cells. Assembled LiFePO4-MWCNT//SEM//Li metal half-cells are found to deliver an initial discharge capacity of 128 mAh g−1 at 0.1 C and an initial Coulombic efficiency of 98%.

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Acknowledgements

One of the authors, Merin K. Wilson, thanks Rashtriya Uchchatar Shiksha Abhiyan (RUSA), Government of India, for financial support through senior research fellowship. The authors acknowledge the funding extended by the Department of Science and Technology, Government of India, in the form of the Funding for Improvement of Science and Technology (DST-FIST) Scheme, for acquiring FE- SEM facility. The authors also acknowledge STIC, CUSAT, Kerala, India, for TEM, DSC, and TGA measurements. S. Jayalekshmi is thankful for the financial assistance from Kerala State Council for Science, Technology, and Environment (KSCSTE) via Emeritus Scientist Scheme.

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  1. B. Jinisha

    Present address: Department of Physics, SES College Sreekandapuram, Kannur, 670 631, India

  2. Merin K. Wilson, Cyril Augustin have contributed equally to this work.

Authors and Affiliations

  1. Division for Research in Advanced Materials (DREAM) Lab, Department of Physics, Cochin University of Science and Technology, Cochin, Kerala, 682 022, India

    Merin K. Wilson, Cyril Augustin, A. Abhilash, B. Jinisha, Aldrin Antony & S. Jayalekshmi

  2. Centre of Excellence in Advanced Materials, Cochin University of Science and Technology, Cochin, Kerala, 682022, India

    Aldrin Antony & S. Jayalekshmi

  3. University of Calicut, Malappuram, Kerala, 673 635, India

    M. K. Jayaraj

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Wilson, M.K., Augustin, C., Abhilash, A. et al. Solid electrolyte membranes with Al2O3 nanofiller for fully solid-state Li-ion cells. Polym. Bull. 81, 6003–6024 (2024). https://doi.org/10.1007/s00289-023-04945-9

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