Foldable lithium-air batteries with a high theoretical specific energy show wide applications in portable electronic devices, and the flexible cathodes play the most important role. In this work, CeO2 microspheres are grown in situ on 3 D interconnected graphene foam by hydrothermal treatment as the flexible cathode for lithium-air batteries. With the assistance of a macroporous framework for rapid O2 diffusion and CeO2 distributed uniformly for enhanced catalytic activity towards the oxygen reduction reaction, the lightweight flexible cathodes show a large discharge capacity of 3250 mA h g−1 at a current density of 200 mA g−1 (based on the whole cathode) and can cycle steadily for 80 times with a capacity limitation of 600 mA h g−1. The flexible lithium-air battery based on the new cathode also shows a stable discharge/charge potential platform during bending and good electrochemical reversibility after bending for at least 1000 times in ambient air. The study reveals that the high-catalytic-activity flexible cathode would be suitable for foldable lithium-air batteries.
ASJC Scopus subject areas
- Physical and Theoretical Chemistry
- Organic Chemistry
- Inorganic Chemistry