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This study introduces a novel binary ionic liquids (BILs) electrolyte that significantly enhances supercapacitor performance. The new electrolyte offers improved conductivity and lower viscosity, leading to higher energy and power densities for advanced energy storage applications.

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Area of Science:

  • Electrochemistry
  • Materials Science
  • Energy Storage

Background:

  • Supercapacitors require high energy and power densities for practical use.
  • Ionic liquids (ILs) offer electrochemical stability but suffer from high viscosity and low conductivity, limiting supercapacitor performance.
  • Existing organic electrolytes in supercapacitors have limitations in working voltage.

Purpose of the Study:

  • To develop a novel binary ionic liquids (BILs) hybrid electrolyte to overcome the limitations of traditional ILs.
  • To improve the ionic conductivity and reduce the viscosity of IL electrolytes for enhanced supercapacitor performance.
  • To achieve higher energy and power densities in supercapacitors compared to existing commercial options.

Main Methods:

  • Formulation of a binary ionic liquids (BILs) electrolyte by mixing trimethyl propylammonium bis(trifluoromethanesulfonyl)imide ([TMPA][TFSI]) and N-butyl-N-methylpyrrolidinium bis(trifluoromethanesulfonyl)imide ([Pyr14][TFSI]) in acetonitrile.
  • Characterization of the BILs electrolyte's conductivity, viscosity, and electrochemical stability window.
  • Assembly and testing of supercapacitors using activated carbon electrodes and the developed BILs electrolyte.

Main Results:

  • The prepared BILs electrolyte exhibited superior electric conductivity (44.3 mS cm⁻¹) and low viscosity (0.692 mPa s).
  • The electrolyte demonstrated a wide electrochemical stability window of 4.82 V.
  • Supercapacitors achieved a high working voltage of 3.1 V, with a maximum energy density of 28.3 Wh kg⁻¹ and power density of 32.16 kW kg⁻¹.

Conclusions:

  • The novel BILs hybrid electrolyte significantly enhances supercapacitor performance, offering superior energy and power densities.
  • This advanced electrolyte system surpasses the performance of commercial supercapacitors based on conventional organic electrolytes.
  • The findings pave the way for next-generation supercapacitors with improved efficiency and rate capabilities.