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Abstract
Non-aqueous metal-oxygen batteries depend critically on the reversible formation/decomposition of metal oxides on cycling. Irreversible parasitic reactions cause poor rechargeability, efficiency, and cycle life, and have predominantly been ascribed to the reactivity of reduced oxygen species with cell components. These species, however, cannot fully explain the side reactions. Here we show that singlet oxygen forms at the cathode of a lithium-oxygen cell during discharge and from the onset of charge, and accounts for the majority of parasitic reaction products. The amount increases during discharge, early stages of charge, and charging at higher voltages, and is enhanced by the presence of trace water. Superoxide and peroxide appear to be involved in singlet oxygen generation. Singlet oxygen traps and quenchers can reduce parasitic reactions effectively. Awareness of the highly reactive singlet oxygen in non-aqueous metal-oxygen batteries gives a rationale for future research towards achieving highly reversible cell operation.
Originalsprache | englisch |
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Aufsatznummer | 17036 |
Fachzeitschrift | Nature Energy |
Jahrgang | 2 |
Ausgabenummer | 5 |
DOIs | |
Publikationsstatus | Veröffentlicht - 20 März 2017 |
ASJC Scopus subject areas
- Energieanlagenbau und Kraftwerkstechnik
- Feuerungstechnik
- Erneuerbare Energien, Nachhaltigkeit und Umwelt
- Elektronische, optische und magnetische Materialien
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Oxygen Redox and Singlet Oxygen in Non-aqueous Battery Chemistries
Stefan Freunberger (Redner/in)
5 Aug. 2019Aktivität: Vortrag oder Präsentation › Gastvortrag › Science to science
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Singlet Oxygen in Non-aqueous Battery Chemistries
Stefan Freunberger (Redner/in)
10 Juni 2018 → 14 Juni 2018Aktivität: Vortrag oder Präsentation › Vortrag bei Workshop, Seminar oder Kurs › Science to science
Auszeichnungen
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Tajima Prize
Freunberger, Stefan (Empfänger/-in), 7 Sept. 2018
Auszeichnung: Preise / Medaillen / Ehrungen