Singlet oxygen during cycling of the aprotic sodium-O2 battery

L. Schafzahl, N. Mahne, B. Schafzahl, M. Wilkening, C. Slugovc, S.M. Borisov, S.A. Freunberger, Angewandte Chemie International Edition 56 (2017) 15728–15732.

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Journal Article | Published | English
Author
Schafzahl, Lukas; Mahne, Nika; Schafzahl, Bettina; Wilkening, Martin; Slugovc, Christian; Borisov, Sergey M.; Freunberger, Stefan AlexanderIST Austria
Abstract
Aprotic sodium–O2 batteries require the reversible formation/dissolution of sodium superoxide (NaO2) on cycling. Poor cycle life has been associated with parasitic chemistry caused by the reactivity of electrolyte and electrode with NaO2, a strong nucleophile and base. Its reactivity can, however, not consistently explain the side reactions and irreversibility. Herein we show that singlet oxygen (1O2) forms at all stages of cycling and that it is a main driver for parasitic chemistry. It was detected in‐ and ex‐situ via a 1O2 trap that selectively and rapidly forms a stable adduct with 1O2. The 1O2 formation mechanism involves proton‐mediated superoxide disproportionation on discharge, rest, and charge below ca. 3.3 V, and direct electrochemical 1O2 evolution above ca. 3.3 V. Trace water, which is needed for high capacities also drives parasitic chemistry. Controlling the highly reactive singlet oxygen is thus crucial for achieving highly reversible cell operation.
Publishing Year
Date Published
2017-12-04
Journal Title
Angewandte Chemie International Edition
Volume
56
Issue
49
Page
15728-15732
ISSN
IST-REx-ID

Cite this

Schafzahl L, Mahne N, Schafzahl B, et al. Singlet oxygen during cycling of the aprotic sodium-O2 battery. Angewandte Chemie International Edition. 2017;56(49):15728-15732. doi:10.1002/anie.201709351
Schafzahl, L., Mahne, N., Schafzahl, B., Wilkening, M., Slugovc, C., Borisov, S. M., & Freunberger, S. A. (2017). Singlet oxygen during cycling of the aprotic sodium-O2 battery. Angewandte Chemie International Edition, 56(49), 15728–15732. https://doi.org/10.1002/anie.201709351
Schafzahl, Lukas, Nika Mahne, Bettina Schafzahl, Martin Wilkening, Christian Slugovc, Sergey M. Borisov, and Stefan Alexander Freunberger. “Singlet Oxygen during Cycling of the Aprotic Sodium-O2 Battery.” Angewandte Chemie International Edition 56, no. 49 (2017): 15728–32. https://doi.org/10.1002/anie.201709351.
L. Schafzahl et al., “Singlet oxygen during cycling of the aprotic sodium-O2 battery,” Angewandte Chemie International Edition, vol. 56, no. 49, pp. 15728–15732, 2017.
Schafzahl L, Mahne N, Schafzahl B, Wilkening M, Slugovc C, Borisov SM, Freunberger SA. 2017. Singlet oxygen during cycling of the aprotic sodium-O2 battery. Angewandte Chemie International Edition. 56(49), 15728–15732.
Schafzahl, Lukas, et al. “Singlet Oxygen during Cycling of the Aprotic Sodium-O2 Battery.” Angewandte Chemie International Edition, vol. 56, no. 49, Wiley, 2017, pp. 15728–32, doi:10.1002/anie.201709351.
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2020-01-26
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