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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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Ionic liquid enabled FeS2 for high-energy-density lithium-ion batteries.
Tyler Evans1, Daniela Molina Piper, Seul Cham Kim
1Department of Mechanical Engineering, University of Colorado at Boulder, Boulder, CO, 80309, USA.
Advanced Materials (Deerfield Beach, Fla.)
|September 20, 2014
Summary
High-energy-density iron disulfide (FeS2) cathodes were developed using a bis(trifluoromethanesulfonyl)imide (TFSI-) anion-based room temperature ionic liquid (RTIL) electrolyte. This approach mitigates polysulfide dissolution, enhancing cathode performance for advanced battery applications.
Area of Science:
- Electrochemistry
- Materials Science
- Energy Storage
Background:
- Sulfur-based cathode chemistries suffer from polysulfide dissolution, leading to a parasitic redox shuttle mechanism.
- This polysulfide shuttle limits the energy density and cycle life of batteries utilizing these materials.
Purpose of the Study:
- To develop high-energy-density cathodes for advanced battery applications.
- To mitigate the polysulfide dissolution and redox shuttle effect in sulfur-based electrode chemistries.
- To investigate the stabilizing effect of bis(trifluoromethanesulfonyl)imide (TFSI-) anion-based room temperature ionic liquid (RTIL) electrolytes on iron disulfide (FeS2) cathodes.
Main Methods:
- Demonstration of high-energy-density FeS2 cathodes.
- Utilizing a bis(trifluoromethanesulfonyl)imide (TFSI-) anion-based room temperature ionic liquid (RTIL) electrolyte.
- Analysis of polysulfide dissolution mitigation and redox shuttle suppression.
Main Results:
- FeS2 cathodes enabled by a TFSI-based RTIL electrolyte demonstrated significantly improved performance.
- The TFSI-based IL effectively mitigated polysulfide dissolution, suppressing the redox shuttle mechanism.
- Achieved an energy density of 542 Wh kg(-1) (normalized to cathode composite mass), one of the highest reported for FeS2 cathodes.
Conclusions:
- TFSI-based RTIL electrolytes are effective in stabilizing FeS2 cathodes.
- This stabilization leads to high energy density and overcomes limitations of traditional sulfur-based chemistries.
- The developed FeS2 cathodes represent a promising advancement in energy storage technology.
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