Journal
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
Volume 57, Issue 23, Pages 6825-6829Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/anie.201801399
Keywords
air electrodes; carbon membranes; hierarchically porous structures; Li-O-2 batteries; macropore kinetics
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Funding
- National Natural Science Foundation of China [51472158, 21331004]
- National Basic Research Program of China [2014CB932102]
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Free-standing macroporous air electrodes with enhanced interfacial contact, rapid mass transport, and tailored deposition space for large amounts of Li2O2 are essential for improving the rate performance of Li-O-2 batteries. An ordered mesoporous carbon membrane with continuous macroporous channels was prepared by inversely topological transformation from ZnO nanorod array. Utilized as a free-standing air cathode for Li-O-2 battery, the hierarchically porous carbon membrane shows superior rate performance. However, the increased cross-sectional area of the continuous macropores on the cathode surface leads to a kinetic overpotential with large voltage hysteresis and linear voltage variation against Butler-Volmer behavior. The kinetics were investigated based on the rate-determining step of second electron transfer accompanied by migration of Li+ in solid or quasi-solid intermediates. These discoveries shed light on the design of the air cathode for Li-O-2 batteries with high-rate performance.
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