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Updated: Jul 27, 2025
08:18
Protocol of Electrochemical Test and Characterization of Aprotic Li-O2 Battery
Published on: July 12, 2016
11.5K
Solvation Structure with Enhanced Anionic Coordination for Stable Anodes in Lithium-Oxygen Batteries
Yaohui Huang1, Jiarun Geng1, Zhuoliang Jiang1
1Key Laboratory of Advanced Energy Materials Chemistry (Ministry of Education), Frontiers Science Center for New Organic Matter, Renewable Energy Conversion and Storage Center (RECAST), College of Chemistry, Nankai University, Tianjin, 300071, China.
Angewandte Chemie (International Ed. in English)
|June 7, 2023
Summary
Researchers developed a new electrolyte strategy to stabilize lithium anodes in lithium-oxygen (Li-O2) batteries. This approach improves lithium plating/stripping efficiency and extends battery lifespan by over 120 cycles.
Area of Science:
- Electrochemistry
- Materials Science
- Energy Storage
Background:
- Lithium-oxygen (Li-O2) batteries offer high theoretical energy density but suffer from performance limitations.
- Irreversible lithium plating and stripping on the anode are critical issues hindering Li-O2 battery stability.
- Developing stable lithium anodes is crucial for advancing next-generation energy storage technologies.
Purpose of the Study:
- To investigate a solvation-regulated strategy for enhancing the stability of lithium anodes in Li-O2 batteries.
- To mitigate lithium anode degradation by modifying the electrolyte composition and Li+ solvation sheath.
- To improve the cycling performance and efficiency of Li-O2 batteries through rational electrolyte design.
Main Methods:
- Incorporation of trifluoroacetate anions (TFA-) into a tetraethylene glycol dimethyl ether (G4) based electrolyte containing lithium bis(fluorosulfonyl)imide (LiTFSI).
- Formulation of a bisalt electrolyte (0.5 M LiTFA and 0.5 M LiTFSI in G4) to create anion-dominant solvates.
- Analysis of electrolyte decomposition, solid electrolyte interphase (SEI) formation, and desolvation energy barriers.
Main Results:
- The bisalt electrolyte significantly attenuated Li+-G4 interactions, suppressing G4 decomposition.
- An inorganic-rich SEI layer was formed, facilitating facile interfacial Li+ diffusion.
- The desolvation energy barrier for Li+ was reduced from 58.20 to 46.31 kJ mol-1.
- The modified electrolyte enabled extended cycling performance of 120 cycles in Li-O2 batteries with a limited Li anode.
Conclusions:
- Solvation regulation using TFA- anions is an effective strategy for stabilizing lithium anodes in Li-O2 batteries.
- The developed electrolyte enhances Li+ kinetics and promotes the formation of a protective SEI layer.
- This research provides valuable insights for designing advanced electrolytes for high-performance Li-O2 energy storage systems.
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