Mechanistic Understanding of Oxygen Electrodes in Rechargeable Multivalent Metal‐Oxygen Batteries

Abstract Rechargeable multivalent metal‐O 2 batteries (Mg−O 2 , Zn−O 2 and Al−O 2 etc.) are promising next‐generation battery technologies for electric automobiles and large‐scale energy storage owing to their high energy density, low cost, and sustainability. To realize the full potentials of these systems, an in‐depth mechanistic understanding of the underlying chemistries is crucial for rational development. However, compared with the intensively studied Li−O 2 batteries, reaction mechanisms of multivalent metal‐O 2 batteries are much less understood. Here, we discuss the current status of mechanistic understanding of oxygen reduction and evolution reactions in rechargeable multivalent metal‐O 2 batteries. We discuss the key open questions and future research directions of multivalent metal‐O 2 batteries using examples and experiences from Li−O 2 batteries, which could guide and inspire the development of multivalent metal‐O 2 batteries.