Ionic conductivity of deep eutectic solvents: The role of orientational dynamics and glassy freezing

Abstract

We have performed a thorough examination of the reorientational relaxation dynamics and the ionic charge transport of three typical deep eutectic solvents, ethaline, glyceline and reline by broadband dielectric spectroscopy. Our experiments cover a broad temperature range from the low-viscosity liquid down to the deeply supercooled state, allowing to investigate the significant influence of glassy freezing on the ionic charge transport in these systems. In addition, we provide evidence for a close coupling of the ionic conductivity in these materials to reorientational dipolar motions which should be considered when searching for deep eutectic solvents optimized for electrochemical applications.

arXiv comment9 pages, 6 figures + Supplementary Information (1 page, 1 figure)

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• Universal correlations between the fragility and interparticle repulsion of glass-forming liquids
• On the Coupling between Ionic Conduction and Dipolar Relaxation in Deep Eutectic Solvents: Influence of Hydration and Glassy Dynamics
• Plastic-crystalline solid-state electrolytes: Ionic conductivity and orientational dynamics in nitrile mixtures
• Lithium-salt-based deep eutectic solvents: Importance of glass formation and rotation-translation coupling for the ionic charge transport
• Ionic conductivity and relaxation dynamics in plastic-crystals with nearly globular molecules
• Ionic conductivity of a lithium-doped deep eutectic solvent: Glass formation and rotation-translation coupling
• Translational and reorientational dynamics in carboxylic acid-based deep eutectic solvents
• Rotational dynamics, ionic conductivity, and glass formation in a ZnCl2-based deep eutectic solvent
• Prigogine-Defay ratio of glassy freezing scales with liquid fragility