Aqueous Co-Solvent in Zwitterionic-based Protic Ionic Liquids as Electrolytes in 2.0 V Supercapacitors
Xuejun Lu1, José Manuel Vicent-Luna2,3, Sofia Calero2,4
1Instituto de Ciencia de Materiales de Madrid-ICMM, Consejo Superior de Investigaciones Científicas-CSIC, Campus de Cantoblanco, 28049, Madrid, Spain.
Chemsuschem
|September 14, 2020
Summary
New zwitterionic-based protic ionic liquids (ZPILs) were synthesized by adding betaine to protic ionic liquids. These ZPILs exhibit enhanced properties for energy storage, including room-temperature liquidity and high electrochemical stability.
Area of Science:
- Materials Science
- Electrochemistry
- Sustainable Energy
Background:
- High-performance energy storage is crucial for integrating renewable energy sources.
- Electrolytes, particularly ionic liquids (ILs), are key components requiring optimization.
- Protic ionic liquids (PILs) offer potential but often lack room-temperature liquidity and stability.
Purpose of the Study:
- To develop novel electrolytes with tunable properties for advanced energy storage.
- To investigate the synthesis and characteristics of zwitterion-modified protic ionic liquids (ZPILs).
- To evaluate the electrochemical performance of these ZPILs in energy storage applications.
Main Methods:
- Stoichiometric addition of betaine (BET), a zwitterion, to protic ionic liquids (PILs) like [EOAH]+[MSA]- and [EOAH]+[PTSA]-.
- Characterization of the resulting zwitterionic-based PILs (ZPILs) for their physical and electrochemical properties.
- Testing of ZPILs mixed with aqueous co-solvents (WcS) in electrochemical devices to assess capacitance and cycling stability.
Main Results:
- Synthesized ZPILs ([EOAH]+[BET][MSA]- and [EOAH]+[BET][PTSA]-) were liquid at room temperature, unlike their parent PILs.
- ZPILs demonstrated wide electrochemical stability windows (up to 3.7 V and 4.0 V, respectively) and good miscibility with water and co-solvents.
- A WcS-in-ZPIL mixture ([EOAH]+[BET][MSA]- in 2H2O/ACN/DMSO) achieved 83 F/g capacitance and 90% capacity retention over 6000 cycles.
Conclusions:
- Zwitterion addition is an effective strategy to enhance the properties of protic ionic liquids for energy storage.
- The developed ZPILs offer a promising platform for high-performance, stable, and tunable electrolytes.
- These findings contribute to the advancement of sustainable energy storage solutions.
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