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Mechanism and performance of lithium–oxygen batteries – a perspective

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Abstract

Rechargeable Li–O2 batteries have amongst the highest formal energy and could store significantly more energy than other rechargeable batteries in practice if at least a large part of their promise could be realized. Realization, however, still faces many challenges than can only be overcome by fundamental understanding of the processes taking place. Here, we review recent advances in understanding the chemistry of the Li–O2 cathode and provide a perspective on dominant research needs. We put particular emphasis on issues that are often grossly misunderstood: realistic performance metrics and their reporting as well as identifying reversibility and quantitative measures to do so. Parasitic reactions are the prime obstacle for reversible cell operation and have recently been identified to be predominantly caused by singlet oxygen and not by reduced oxygen species as thought before. We discuss the far reaching implications of this finding on electrolyte and cathode stability, electrocatalysis, and future research needs.

Graphical abstract: Mechanism and performance of lithium–oxygen batteries – a perspective

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Publication details

The article was received on 06 Jun 2017, accepted on 31 Jul 2017 and first published on 31 Jul 2017


Article type: Perspective
DOI: 10.1039/C7SC02519J
Citation: Chem. Sci., 2017, Advance Article
  • Open access: Creative Commons BY license
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    Mechanism and performance of lithium–oxygen batteries – a perspective

    N. Mahne, O. Fontaine, M. O. Thotiyl, M. Wilkening and S. A. Freunberger, Chem. Sci., 2017, Advance Article , DOI: 10.1039/C7SC02519J

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