Journal
JOURNAL OF POWER SOURCES
Volume 248, Issue -, Pages 1270-1274Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.jpowsour.2013.10.041
Keywords
Lithium-air battery; Carbon and binder free cathode; Cobalt oxide catalyst; Flake array film
Funding
- National Science Foundation of China (NSFC) [20903031, 21203044]
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Pt nanoparticles modified Co3O4 flake arrays are prepared by an electrochemically assisted method and the subsequent cool sputtering, a carbon and binder free approach. When used as the cathode catalysts of Li-O-2 batteries, these porous films supply the O-2 transport adequate channels by the macropores surrounded by CO3O4 flakes, which endow the cathodes stable two-phase interface in discharge/charge processes. The superior ability of Pt catalyzing O-2 evolution leads the batteries showing a much lower overpotential (3.2 V) in charge process compared with those using pristine Co3O4 arrays as catalysts (4.0 V). The enhancement of decomposing the discharging precipitate promotes the Li-O-2 batteries' reversibility obviously, which realize more than 30 discharge/charge cycles. (C) 2013 Elsevier B.V. All rights reserved.
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