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Ion jellys (IJs), composites of gelatin and ionic liquids (ILs), show promising thermal stability and transport properties. These amorphous materials exhibit high conductivity and diffusion coefficients, making them suitable for electrochemical devices.

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Area of Science:

  • Materials Science
  • Physical Chemistry
  • Electrochemistry

Background:

  • Ionic liquids (ILs) are versatile electrolytes, but their liquid nature can pose challenges in device applications.
  • Ion jellys (IJs), composites of gelatin and ILs, offer a potential solution by immobilizing ILs within a stable matrix.

Purpose of the Study:

  • To investigate the thermal behavior and transport properties of ion jellys (IJs) composed of gelatin and various ionic liquids (ILs).
  • To evaluate the potential of IJs as stable electrolytes for electrochemical devices.

Main Methods:

  • Dielectric relaxation spectroscopy (DRS)
  • Differential scanning calorimetry (DSC)
  • Pulsed field gradient nuclear magnetic resonance spectroscopy (PFG NMR)

Main Results:

  • All investigated ILs and IJs exhibit glass transition behavior, with IJs showing increased glass transition temperatures upon dehydration.
  • IJs remain amorphous upon thermal cycling, unlike some ILs that can crystallize.
  • DRS and PFG NMR measurements showed excellent agreement for cation diffusion coefficients (D+), obeying the VFTH equation over a wide temperature range.
  • The ion jelly derived from EMIMDCA demonstrated the highest conductivity (∼10⁻² S·cm⁻¹) and diffusion coefficient (∼10⁻¹⁰ m²·s⁻¹).

Conclusions:

  • Ion jellys are stable, amorphous materials with tunable transport properties suitable for electrochemical applications.
  • The gelatin matrix effectively immobilizes ILs, enhancing thermal stability and maintaining high ionic conductivity.
  • These findings open avenues for developing novel, stable electrolytes for various electrochemical devices.