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Synthesis of Ionic Liquid Based Electrolytes, Assembly of Li-ion Batteries, and Measurements of Performance at High Temperature
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Do Ionic Liquids Slow Down in Stages?

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Ionic liquids (ILs) with the trihexyltetradecylphosphonium cation show distinct stages when cooling from liquid to glass. The charge network slows first, followed by the apolar domain, suggesting separate structural-dynamic changes.

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Area of Science:

  • Materials Science
  • Physical Chemistry
  • Chemical Physics

Background:

  • Recent studies highlight liquid-liquid (L-L) phase transitions in ionic liquids (ILs) with the trihexyltetradecylphosphonium cation (P666,14+).
  • This cation is known as the "universal liquifier" due to its unique properties.
  • Understanding the transition from liquid to glass state in these ILs is crucial for their application.

Purpose of the Study:

  • To investigate the structural-dynamic pathway of ionic liquids containing the P666,14+ cation from a liquid to a glassy state.
  • To elucidate the distinct stages and molecular dynamics involved in this transition.
  • To explore the potential relationship between these stages and observed L-L and glass transitions.

Main Methods:

  • Experimental characterization of ionic liquid behavior.
  • Computational modeling and simulations.
  • Analysis of structural and dynamic changes upon cooling.

Main Results:

  • Evidence suggests a two-stage process during cooling from liquid to glass.
  • The first stage involves the slowdown of the charge network while the apolar subcomponent remains mobile.
  • The second stage involves the subsequent slowdown of the apolar domain.

Conclusions:

  • The pathway from liquid to glass in P666,14+-based ILs involves separate structural-dynamic changes.
  • These distinct stages may be linked to liquid-liquid and glass transitions, but further research is needed.
  • The findings provide insight into the complex behavior of "universal liquifier" ionic liquids.