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Ionic Conductivity of a Lithium-Doped Deep Eutectic Solvent: Glass Formation and Rotation-Translation Coupling.

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Adding lithium salts to deep eutectic solvents like glyceline impacts their properties. This study reveals how lithium affects glassy freezing and ionic conductivity, crucial for battery electrolytes.

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Area of Science:

  • Electrochemistry
  • Materials Science
  • Physical Chemistry

Background:

  • Deep eutectic solvents (DESs) with lithium salts are promising electrolytes for electrochemical devices due to lower costs.
  • Understanding the behavior of these electrolytes, particularly glassy freezing and ion dynamics, is essential for device performance.
  • Limited knowledge exists regarding the rotational-translation coupling and freezing behavior of lithium-doped DESs.

Purpose of the Study:

  • To investigate the glassy freezing and rotational-translation coupling in lithium chloride-doped glyceline.
  • To analyze the impact of lithium admixture on the dielectric properties and ionic conductivity of glyceline.
  • To explore the relationship between ionic and dipolar dynamics and glass transition in these systems.

Main Methods:

  • Dielectric spectroscopy was employed to study glyceline with 1 and 5 mol % LiCl.
  • Measurements were conducted over a wide temperature range, including deeply supercooled states.
  • Analysis focused on dipolar reorientation dynamics and ionic direct current (dc) conductivity.

Main Results:

  • Lithium admixture in glyceline showed signatures of glassy freezing.
  • Ionic conductivity and dipolar mobility decreased with lithium addition but less significantly than in other DESs.
  • Ionic and dipolar dynamics became decoupled at low temperatures, following a fractional Debye-Stokes-Einstein relation.

Conclusions:

  • Lithium doping influences the glass transition and dynamics of glyceline.
  • Decoupling effects and glass transition are relevant for enhancing ionic conductivity in lithium-doped DESs.
  • These findings are significant for the development of advanced electrolytes for batteries and supercapacitors.