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Application of imidazolium-based ionic liquids as electrolytes for supercapacitors with superior performance at a wide temperature range

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Abstract

A potential new family of adaptable, ecologically acceptable solvent systems are ionic liquids (ILs). This study is the first to offer a new method for using imidazolium-based ILs as affordable, anti-corrosion electrolytes for activated carbon-based electrochemical capacitors (ECs). In this context, the ILs 1-hexyl 3-methylimidazolium bromide ([HMIM]Br) and 1-ethyl 3-methylimidazolium ethyl sulfate ([EMIM]ES) were synthesized. In the region of ambient temperature up to 105 °C, significant features including viscosity, electrical conductivity, and electrochemical tests were investigated. The symmetric ECs in imidazolium-based electrolytes, which display exceptional electrochemical stability at a maximum voltage of up to 3.5 V, deliver high energy. At room temperature, the specific capacitance of the electrolyte containing IL [HMIM]Br drops to 87 F g−1 (with an energy density of 37 Wh kg−1) from 174 F g−1 (with an energy density of 74 Wh kg−1) under 105 °C. In addition, the supercapacitor made using IL [HMIM]Br retained 90.6% of its capacity up to 10,000 cycles at 105 °C. The findings have significant ramifications for extending the use of eco-friendly, non-toxic, and affordable electrolytes for high-performance ECs with broad voltage windows and improved longevity.

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Acknowledgements

The authors acknowledge the facilities from their universities.

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Authors and Affiliations

  1. College of Marxism, Xi’an Siyuan University, Xi’an ShaanXi, 710038, China

    Yihua Liu

  2. College of Dentistry, Al-Farahidi University, Baghdad, Iraq

    Hussein Adel

  3. Department of Radiology & Sonar Techniques, Al-Noor University College, Nineveh, Iraq

    Sura Mohammad Mohealdeen

  4. Department of Electrical Engineering, GLA University, Mathura, 281406, India

    Subhash Chandra

  5. Department of Computer Engineering Technology, Al Kitab University, Altun Kopru, Kirkuk, 00964, Iraq

    A. H. Shather

  6. Department of Pharmacy, Al-Zahrawi University College, Karbala, Iraq

    Ayat Hussein Adhab

  7. Department of Medical Engineering, Al-Hadi University College, Baghdad, 10011, Iraq

    Ayadh Al-khalidi

  8. College of Pharmacy, Al-Ayen University, Thi-Qar, Iraq

    Mais Mazin Al-Hamdani

  9. College of Technical Engineering, The Islamic University, Najaf, Iraq

    Ali R. Alsalami

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  1. Yihua Liu
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Liu, Y., Adel, H., Mohealdeen, S.M. et al. Application of imidazolium-based ionic liquids as electrolytes for supercapacitors with superior performance at a wide temperature range. J Solid State Electrochem (2023). https://doi.org/10.1007/s10008-023-05763-9

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  • DOI: https://doi.org/10.1007/s10008-023-05763-9

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