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Solid-state Graft Copolymer Electrolytes for Lithium Battery Applications
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Regulating Electrostatic Interaction between Hydrofluoroethers and Carbonyl Cathodes toward Highly Stable
Yong Lu1, Zhuo Yang1, Qiu Zhang1
1Frontiers Science Center for New Organic Matter, Key Laboratory of Advanced Energy Materials Chemistry (Ministry of Education), State Key Laboratory of Advanced Chemical Power Sources, College of Chemistry, Nankai University, Tianjin 300071, China.
Journal of the American Chemical Society
|December 21, 2023
Summary
Researchers developed new hydrofluoroethers (HFEs) to reduce the dissolution of organic carbonyl cathode materials in lithium batteries. This innovation significantly improves cycling stability and battery lifespan.
Area of Science:
- Electrochemistry
- Materials Science
- Organic Chemistry
Background:
- Organic carbonyl compounds offer high capacity and sustainability for lithium batteries.
- Their practical use is limited by high solubility in electrolytes, causing poor cycling and shuttle effects.
Purpose of the Study:
- To develop novel hydrofluoroethers (HFEs) that minimize dissolution of organic carbonyl cathode materials.
- To enhance cycling stability and lifespan of lithium batteries utilizing these materials.
Main Methods:
- Theoretical calculations to assess electrostatic interactions between HFEs and organic carbonyl materials (e.g., pyrene-4,5,9,10-tetraone, PTO).
- In situ ultraviolet-visible spectroscopy to quantify PTO dissolution in HFE-based electrolytes.
- Electrochemical cycling tests to evaluate battery performance.
Main Results:
- HFEs exhibit significantly weaker electrostatic interactions with PTO compared to conventional solvents.
- PTO dissolution was markedly reduced in HFE-based electrolytes.
- A specific HFE-based electrolyte enabled PTO to retain 78% capacity after 1000 cycles.
Conclusions:
- Weakening electrostatic interactions is an effective strategy to suppress organic carbonyl material dissolution.
- HFE-based electrolytes can substantially improve the cycling stability and longevity of lithium batteries.
- This research paves the way for more durable organic carbonyl cathode materials.
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