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Revealing the charge/discharge mechanism of Na–O2 cells by in situ soft X-ray absorption spectroscopy

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Abstract

Developing high energy density batteries, such as metal–air systems, requires a good understanding of their underlying electrochemical principles. In situ characterization methods provide valuable insight into the discharge/charge mechanism of Na–O2 cells. However, previous application of soft X-ray absorption spectroscopy has been limited to ex situ studies on the discharge products of the cell. Here we report an in situ soft X-ray absorption technique for Na–O2 cells to study the formation and decomposition of the discharge products during battery cycling. Taking advantage of the elemental selectivity and chemical sensitivity of soft X-ray absorption spectroscopy, we reveal the instability of discharge products in the Na–O2 cell environment. Our results illustrate that in situ soft X-ray absorption spectroscopy is an efficient probe to study the electrochemical mechanism of alkali metal–O2 energy storage systems.

Graphical abstract: Revealing the charge/discharge mechanism of Na–O2 cells by in situ soft X-ray absorption spectroscopy

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Publication details

The article was received on 09 Mar 2018, accepted on 16 May 2018 and first published on 24 May 2018


Article type: Paper
DOI: 10.1039/C8EE00721G
Citation: Energy Environ. Sci., 2018, Advance Article
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    Revealing the charge/discharge mechanism of Na–O2 cells by in situ soft X-ray absorption spectroscopy

    M. N. Banis, H. Yadegari, Q. Sun, T. Regier, T. Boyko, J. Zhou, Y. M. Yiu, R. Li, Y. Hu, T. K. Sham and X. Sun, Energy Environ. Sci., 2018, Advance Article , DOI: 10.1039/C8EE00721G

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