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Solid-state Graft Copolymer Electrolytes for Lithium Battery Applications
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Conductivity-Relaxation Relations in Nanocomposite Polymer Electrolytes Containing Ionic Liquid.
Mansoureh Shojaatalhosseini1, Khalid Elamin1,2, Jan Swenson1
1Department of Physics, Chalmers University of Technology , SE-412 96 Göteborg, Sweden.
The Journal of Physical Chemistry. B
|September 20, 2017
Summary
Ionic liquids in polymer electrolytes can decouple Li+ ion conductivity from polymer dynamics. At higher concentrations, ion motion becomes viscosity-dependent, especially at lower temperatures.
Area of Science:
- Materials Science
- Electrochemistry
- Polymer Science
Background:
- Polymer electrolytes are crucial for advanced energy storage devices.
- Understanding ion transport mechanisms in polymer electrolytes is key to improving performance.
- Nanocomposite polymer electrolytes offer enhanced properties but require further optimization.
Purpose of the Study:
- To investigate the effect of an ionic liquid on ion dynamics in a PEO-based nanocomposite polymer electrolyte.
- To determine if the ionic liquid can decouple Li+ ion conductivity from polymer segmental motion.
- To elucidate the relationship between ionic liquid concentration, temperature, and relaxation processes.
Main Methods:
- Synthesis of nanocomposite polymer electrolytes using poly(ethylene oxide) (PEO), δ-Al2O3 nanoparticles, and LiTFSI salt.
- Addition of varying concentrations of the ionic liquid 1-butyl-3-methylimidazolium bis(trifluoromethanesolfonyl)imide (BMITFSI).
- Analysis using Differential Scanning Calorimetry (DSC) and dielectric spectroscopy.
Main Results:
- The ionic liquid accelerates both polymer segmental dynamics and Li+ ion motion.
- Decoupling of Li+ ion motion from polymer dynamics occurs at ionic liquid concentrations ≥20 wt %.
- This decoupling is more pronounced at lower temperatures and linked to the ionic liquid's viscosity.
- Observed local relaxation processes (β and γ) show varying sensitivity to ionic liquid concentration.
Conclusions:
- Ionic liquids can effectively decouple ion conductivity from polymer dynamics in nanocomposite electrolytes at sufficient concentrations.
- The viscosity of the ionic liquid plays a significant role in ion transport at higher concentrations and lower temperatures.
- Understanding these relaxation dynamics is crucial for designing high-performance solid-state batteries.
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