期刊
ELECTROCHIMICA ACTA
卷 103, 期 -, 页码 44-49出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.electacta.2013.04.027
关键词
Round trip efficiency; Li-air battery; Sulfuric acid electrolyte; Bifunctional catalyst; Oxygen evolution
资金
- U.S. Department of Energy ARPA-E grant [DEAR0000066]
Previously it was shown that Pt as cathode catalyst ha's a large overpotential during charge in rechargeable hybrid Li-air battery with sulfuric acid catholyte. This article demonstrates that a bifunctional catalyst composed of Pt and IrO2 supported on carbon nanotubes can address this problem. The specially designed and synthesized bifunctional catalyst showed significant overpotential reduction and achieved a round trip energy efficiency of 81% after 10 cycles, higher than many achieved in aprotic Li-O-2 batteries. The hybrid Li-air battery was discharged and recharged for 20 cycles at 0.2 mA/cm(2), showing a fairly stable cell performance. A specific capacity of 306 mAh/g and a specific energy of 1110 Wh/kg were obtained for the hybrid Li-air battery in terms of acid weight. (c) 2013 Elsevier Ltd. All rights reserved.
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