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Synthesis of Ionic Liquid Based Electrolytes, Assembly of Li-ion Batteries, and Measurements of Performance at High Temperature
Published on: December 20, 2016
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Dielectric study on mixtures of ionic liquids
E Thoms1,2, P Sippel3, D Reuter1
1Experimental Physics V, Center for Electronic Correlations and Magnetism, University of Augsburg, 86135, Augsburg, Germany.
Scientific Reports
|August 9, 2017
Summary
Mixing ionic liquids precisely tunes physical properties like conductivity and fragility. This cost-effective method offers insights into supercooled liquid behavior and is crucial for energy-storage electrolytes.
Area of Science:
- Materials Science
- Physical Chemistry
- Electrochemistry
Background:
- Ionic liquids are excellent candidates for electrolytes in energy-storage devices.
- Tuning ionic liquid properties is key to optimizing their performance.
- Mixing ionic liquids offers a simple and economical method for property modification.
Purpose of the Study:
- To investigate the effect of mixing two ionic liquids on their physical properties.
- To explore the tunability of dc conductivity and the fragility parameter in ionic liquid mixtures.
- To gain insights into the complex energy landscape of supercooled liquids.
Main Methods:
- Broadband dielectric spectroscopy was employed to analyze dielectric permittivity and conductivity spectra.
- Differential scanning calorimetry was used to determine glass-transition temperatures.
- Two mixing series were studied: imidazole-based with pyridine-based ionic liquids, and imidazole-based ionic liquids with different anions.
Main Results:
- Precise tuning of physical properties, including dc conductivity, was achieved by mixing ionic liquids.
- The fragility parameter of the ionic liquids could be gradually modified through mixing.
- The dynamics in ionic liquid mixtures were found to be predictable based on the fractions of the parent compounds.
Conclusions:
- Mixing ionic liquids is an effective and economical strategy for tailoring their physical properties for energy-storage applications.
- The study provides a method to gradually modify the fragility parameter, aiding research into the energy landscape of supercooled liquids.
- The predictable nature of dynamics in mixtures simplifies the design and application of ionic liquid electrolytes.
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