Abstract
Rechargeable metal-air batteries have attracted intensive research attentions owing to their high gravimetric energy density. However, they suffer from poor cycle life, low round-trip efficiency and low practical energy density. The development of stable and reversible metal-air chemistries requires fundamental understanding on how solvent and salt/additives affect the reaction mechanism and mediation processes. In this presentation, we combine in situ/operando spectroscopy/analytical techniques (online electrochemical mass spectrometry, isotopic labeling and UV-Vis spectroscopy) to reveal the reaction and degradation mechanism of oxygen reduction and oxygen evolution reactions in rechargeable metal-oxygen batteries. We will discuss the role of redox mediator, electrolyte structure-function relationship, and materials design strategies in addressing air-battery degradation.Acknowledgment. This work is supported by a grant from Research Grants Council (RGC) of the Hong Kong Special Administrative Region under CUHK14307919.
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