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<p>Ionic liquids (ILs) have emerged as a promising class of flexible, environmentally benign electrolytes for next-generation energy storage systems. In this study, we present a novel strategy employing the imidazolium-based ionic liquid 1-butyl-3-methylimidazolium chloride ([BMIM]Cl) as a cost-effective and corrosion-resistant electrolyte for electrochemical capacitors (ECs) utilizing activated carbon electrodes. The physicochemical and electrochemical characteristics of [BMIM]Cl including thermal stability, electrical conductivity, viscosity, and electrochemical behavior were systematically evaluated over a temperature range from ambient conditions to 373.15 K. The resulting EC exhibited exceptional electrochemical stability with an operational voltage window of up to 3&#xa0;V. Notably, the specific capacitance of the [BMIM]Cl-based system decreased from 151.67 F g⁻<sup>1</sup> at room temperature to 71.59&#xa0;F g⁻<sup>1</sup> at elevated temperatures, while achieving a maximum energy density of 189.84&#xa0;Wh kg⁻<sup>1</sup> at 100 °C. Moreover, the supercapacitor demonstrated impressive cycling durability, retaining 87.4% of its capacitance after 10,000 cycles at 100&#xa0;°C. These findings underscore the potential of [BMIM]Cl as a non-toxic, sustainable, and high-voltage electrolyte, paving the way for the development of advanced, long-lifespan electrochemical capacitors.</p>

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Leveraging 1-butyl-3-methylimidazolium chloride ionic liquid as high-performance electrolyte for supercapacitors at different temperatures

  • 期刊论文

  • 发表日期：

    2025年11月4日

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  • Narinderjit Singh Sawaran Singh,
  • A. K. Hammad,
  • Dilsora Abduvalieva,
  • Ahmed Kareem Obaid Aldulaimi,
  • Jameel M. A. Sulaiman,
  • Rafid Jihad Albadr,
  • Waam Mohammed Taher,
  • Mariem Alwan,
  • Hiba Mushtaq,
  • S. Kamangar,
  • Saiful Islam,
  • Mohd Abul Hasan

摘要

Ionic liquids (ILs) have emerged as a promising class of flexible, environmentally benign electrolytes for next-generation energy storage systems. In this study, we present a novel strategy employing the imidazolium-based ionic liquid 1-butyl-3-methylimidazolium chloride ([BMIM]Cl) as a cost-effective and corrosion-resistant electrolyte for electrochemical capacitors (ECs) utilizing activated carbon electrodes. The physicochemical and electrochemical characteristics of [BMIM]Cl including thermal stability, electrical conductivity, viscosity, and electrochemical behavior were systematically evaluated over a temperature range from ambient conditions to 373.15 K. The resulting EC exhibited exceptional electrochemical stability with an operational voltage window of up to 3 V. Notably, the specific capacitance of the [BMIM]Cl-based system decreased from 151.67 F g⁻1 at room temperature to 71.59 F g⁻1 at elevated temperatures, while achieving a maximum energy density of 189.84 Wh kg⁻1 at 100 °C. Moreover, the supercapacitor demonstrated impressive cycling durability, retaining 87.4% of its capacitance after 10,000 cycles at 100 °C. These findings underscore the potential of [BMIM]Cl as a non-toxic, sustainable, and high-voltage electrolyte, paving the way for the development of advanced, long-lifespan electrochemical capacitors.