CUED Publications database

Understanding LiOH Chemistry in a Ruthenium-Catalyzed Li–O<inf>2</inf> Battery

Liu, T and Liu, Z and Kim, G and Frith, JT and Garcia-Araez, N and Grey, CP (2017) Understanding LiOH Chemistry in a Ruthenium-Catalyzed Li–O<inf>2</inf> Battery. Angewandte Chemie - International Edition, 56. pp. 16057-16062. ISSN 1433-7851

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Non-aqueous Li–O batteries are promising for next-generation energy storage. New battery chemistries based on LiOH, rather than Li O , have been recently reported in systems with added water, one using a soluble additive LiI and the other using solid Ru catalysts. Here, the focus is on the mechanism of Ru-catalyzed LiOH chemistry. Using nuclear magnetic resonance, operando electrochemical pressure measurements, and mass spectrometry, it is shown that on discharging LiOH forms via a 4 e oxygen reduction reaction, the H in LiOH coming solely from added H O and the O from both O and H O. On charging, quantitative LiOH oxidation occurs at 3.1 V, with O being trapped in a form of dimethyl sulfone in the electrolyte. Compared to Li O , LiOH formation over Ru incurs few side reactions, a critical advantage for developing a long-lived battery. An optimized metal-catalyst–electrolyte couple needs to be sought that aids LiOH oxidation and is stable towards attack by hydroxyl radicals. 2 2 2 2 2 2 2 2 −

Item Type: Article
Uncontrolled Keywords: Li-O2 batteries LiOH dimethyl sulfone oxygen reduction/evolution ruthenium catalysis
Depositing User: Cron Job
Date Deposited: 22 Nov 2017 20:11
Last Modified: 13 Apr 2021 09:56
DOI: 10.1002/anie.201709886