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Silica based ionogels: interface effects with aprotic and protic ionic liquids with lithium.
Angélique Marie1, Bilel Said2, Anne Galarneau2
1Université de Nantes, CNRS, Institut des Matériaux Jean Rouxel, IMN, F-44000 Nantes, France. jean.lebideau@cnrs-imn.fr.
Physical Chemistry Chemical Physics : PCCP
|October 20, 2020
Summary
This study explores ionogels for better ion transport, revealing how silica confinement impacts ionic liquids and their conductivity. The acidity of protic ionic liquids significantly influences interfacial chemistry in these solid electrolytes.
Area of Science:
- Materials Science
- Electrochemistry
- Physical Chemistry
Background:
- Development of solid ionogel electrolytes for enhanced ion transport.
- Utilizing ionic liquids (ILs) confined within mesoporous silica monoliths.
- Investigating aprotic (AIL) and protic (PIL) butylpyrrolidinium bis(trifluoromethylsulfonyl)imide (TFSI) ILs.
Purpose of the Study:
- To study anion-cation coordination in ILs confined within silica matrices.
- To investigate the effects of silica confinement on IL properties like melting point and conductivity.
- To understand the influence of IL type (aprotic vs. protic) on interfacial chemistry.
Main Methods:
- Confining ILs (AIL and PIL with TFSI anions) in silica with 8-16 nm mesoporosities.
- Measuring melting points and ionic conductivity via impedance spectroscopy.
- Analyzing lithium-TFSI coordination using Raman spectroscopy.
Main Results:
- Confinement increased AIL melting point (+2 °C) but decreased PIL melting point (-2 °C).
- Lithium addition increased melting points for both AIL and PIL upon confinement.
- AILs showed a conductivity maximum at 10 nm pore size and 40 °C with 0.5 M lithium; PILs did not exhibit a clear maximum.
- Lithium-TFSI coordination number decreased with AIL confinement but not with PIL confinement.
- PILs altered silica surface acidity, impacting interfacial chemistry differently than AILs.
Conclusions:
- Silica confinement affects IL melting points and conductivity differently based on IL proticity.
- The acidity of protic ionic liquids plays a crucial role in the interfacial chemistry of ionogels.
- Ionogels offer tunable properties for solid electrolyte applications, influenced by host-guest interactions.
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