The reduction of O2 by lithium (Li-ORR) and the reverse reaction of O2 evolution reaction (OER) are the key electrochemical processes at a Li-air cathode. Li-air batteries can potentially far exceed the specific energy of state-of-the-art lithium-ion batteries. However, prototypes suffer from poor discharge-charge efficiency, low current density, and capacity fading. Improving the cycling efficiency of the Li-air cathode is critical to enabling rechargeable Li-air batteries.
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