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Title: Increasing round trip efficiency of hybrid Li-air battery with bifunctional catalysts

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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Publication Date:
OSTI Identifier:
DOE Contract Number:
Resource Type:
Journal Article
Resource Relation:
Journal Name: Electrochimica Acta; Journal Volume: 103
Sponsoring Org:
USDOE Advanced Research Projects Agency - Energy (ARPA-E)
Country of Publication:
United States