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11:04
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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Fully-Zwitterionic Polymer-Supported Ionogel Electrolytes Featuring a Hydrophobic Ionic Liquid.
Morgan E Taylor1, Matthew J Panzer1
1Department of Chemical & Biological Engineering , Tufts University , 4 Colby Street , Medford , Massachusetts 02155 , United States.
The Journal of Physical Chemistry. B
|August 16, 2018
Summary
Researchers developed novel zwitterionic (ZI) copolymer scaffolds for ionogel electrolytes. The study reveals how interactions between zwitterions and ionic liquids influence conductivity and mechanical properties for energy storage.
Area of Science:
- Materials Science
- Electrochemistry
- Polymer Chemistry
Background:
- Ionogel electrolytes are crucial for energy storage devices.
- Developing stable and conductive ionogels requires understanding polymer-electrolyte interactions.
- Zwitterionic (ZI) polymers offer unique properties for electrolyte design.
Purpose of the Study:
- To synthesize fully-zwitterionic (ZI) copolymer scaffolds for ionogel electrolytes.
- To investigate the influence of copolymer composition on ionogel properties.
- To elucidate the interactions between zwitterions and ionic liquids (ILs).
Main Methods:
- In situ photopolymerization of 2-methacryloyloxyethyl phosphorylcholine (MPC) and sulfobetaine vinylimidazole (SBVI).
- Synthesis within the hydrophobic ionic liquid 1-ethyl-3-methylimidazolium bis(trifluoromethylsulfonyl)imide (EMI TFSI).
- Measurement of ionic conductivity, compressive elastic modulus, and ion self-diffusivity.
- Nuclear Magnetic Resonance (NMR) chemical shift analysis.
Main Results:
- Room temperature ionic conductivity varied from 2.5 to 6.7 mS cm⁻¹ based on ZI scaffold composition.
- Compressive elastic moduli ranged from 23 kPa to 11 MPa, dependent on co-monomer ratio and cross-linking.
- MPC interacted more strongly with EMI TFSI, while SBVI self-aggregated.
- Slower ion diffusion in MPC-containing systems was attributed to zwitterion/IL interactions.
Conclusions:
- The study highlights the critical role of relative zwitterion/IL and ZI dipole-dipole interactions.
- These interactions significantly impact the properties of fully-ZI polymer-supported ionogel electrolytes.
- The findings are relevant for designing advanced ionogels for electrical energy storage applications.
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