ChemCatChem
ChemCatChem
4 years ago

Graphene Foam Decorated with Ceria Microspheres as a Flexible Cathode for Foldable Lithium-Air Batteries

Graphene Foam Decorated with Ceria Microspheres as a Flexible Cathode for Foldable Lithium-Air Batteries
Lichao Jia, Yizhen Huang, Lu Zou, Junfang Cheng, Jian Pu, Bo Chi, Jian Li, Xinyu Li, Yuexing Jiang
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. Foam party: CeO2 microspheres on 3 D graphene foam are synthesized by an in situ hydrothermal process. The materials are studied as flexible cathodes for foldable lithium-air batteries and show stable discharge and charge platforms even at 80 cycles.

Publisher URL: http://onlinelibrary.wiley.com/resolve/doi

DOI: 10.1002/cctc.201700942

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