Singlet oxygen is not the main source of electrolyte degradation in lithium–oxygen batteries

Zor, Ceren; Jones, Kieran D.; Rees, Gregory J.; Yang, Sixie; Pateman, Alexander; Gao, Xiangwen; Johnson, Lee R.; Bruce, Peter G.

Abstract

The lithium–air (oxygen) battery could offer significant improvements in gravimetric energy density compared to lithium-ion technology. A major barrier to realising this goal is the oxidative degradation of the electrolyte solution and the carbon at the positive electrode. Recently, the lithium–oxygen field has been focused on the formation of singlet oxygen within the cell, its impact as a major source of degradation, and strategies to mitigate this. Here we have investigated the reactivity of components within the lithium–oxygen cell by exposure to photochemically generated singlet oxygen. We find no significant reaction between the singlet oxygen and tetraglyme, lithium bis(trifluoromethanesulfonyl)imide, or carbon, standard electrode components, and confirm that singlet oxygen is not the major source of degradation in the lithium–oxygen battery. Our studies bring into question the need for strategies to mitigate the impact of singlet oxygen in the cell and highlight the need to refocus on the discovery of electrolyte solutions with stability against lithium peroxide.

Citation

Zor, C., Jones, K. D., Rees, G. J., Yang, S., Pateman, A., Gao, X., Johnson, L. R., & Bruce, P. G. (2024). Singlet oxygen is not the main source of electrolyte degradation in lithium–oxygen batteries. Energy and Environmental Science, 17(19), 7355-7361. https://doi.org/10.1039/d4ee02176b

• Journal Article Type: Article
• Acceptance Date: Aug 14, 2024
• Online Publication Date: Aug 27, 2024
• Publication Date: Oct 7, 2024
• Deposit Date: Nov 11, 2024
• Publicly Available Date: Nov 11, 2024
• Journal: Energy and Environmental Science
• Print ISSN: 1754-5692
• Electronic ISSN: 1754-5706
• Publisher: Royal Society of Chemistry
• Peer Reviewed: Peer Reviewed
• Volume: 17
• Issue: 19
• Pages: 7355-7361
• DOI: https://doi.org/10.1039/d4ee02176b
• Public URL: https://nottingham-repository.worktribe.com/output/39177866
• Publisher URL: https://pubs.rsc.org/en/content/articlelanding/2024/ee/d4ee02176b