Insights into the Chemical Nature and Formation Mechanisms of Discharge Products in Na-O-2 Batteries by Means of Operando X-ray Diffraction - Research portal of Justus Liebig University Giessen:

Journal article

Insights into the Chemical Nature and Formation Mechanisms of Discharge Products in Na-O-2 Batteries by Means of Operando X-ray Diffraction

Authors list: Pinedo, R; Weber, DA; Bergner, B; Schröder, D; Adelhelm, P; Janek, J

Publication year: 2016

Pages: 8472-8481

Journal: Journal of Physical Chemistry C

Volume number: 120

Issue number: 16

ISSN: 1932-7447

eISSN: 1932-7455

DOI Link: https://doi.org/10.1021/acs.jpcc.6b00903

Publisher: American Chemical Society

Abstract:
The chemical nature of discharge products in nonaqueous Na-O-2 batteries attracts attention due to the differing electrochemical behavior of seemingly similar battery cells forming either sodium peroxide (Na2O2) or sodium superoxide (NaO2). The experimental control parameters for the exclusive formation of one or the other phase during discharge are still unknown. In this paper, the important role of gas phase moisture on the chemical nature of these products is demonstrated by means of operando XRD. Operando XRD is rarely reported for alkali O-2 systems but provides valuable real time information about the solid discharge products, growth/decomposition rates, and side reactions in the cell. In addition, the discharge/charge mechanisms of Na2O2 center dot 2H(2)O are monitored in detail evidencing important differences from the cell reactions forming NaO2 and Li2O2 and refuting previous incorrect conclusions. Moreover, the effect of the applied potential window during cycling is discussed, as it provides valuable information for the future development of Na-O-2 batteries as electrochemical energy stores.

Authors/Editors

- Uni.-Prof. Dr. Jürgen Janek

Citation Styles

Harvard Citation style: Pinedo, R., Weber, D., Bergner, B., Schröder, D., Adelhelm, P. and Janek, J. (2016) Insights into the Chemical Nature and Formation Mechanisms of Discharge Products in Na-O-2 Batteries by Means of Operando X-ray Diffraction, Journal of Physical Chemistry C, 120(16), pp. 8472-8481. https://doi.org/10.1021/acs.jpcc.6b00903

APA Citation style: Pinedo, R., Weber, D., Bergner, B., Schröder, D., Adelhelm, P., & Janek, J. (2016). Insights into the Chemical Nature and Formation Mechanisms of Discharge Products in Na-O-2 Batteries by Means of Operando X-ray Diffraction. Journal of Physical Chemistry C. 120(16), 8472-8481. https://doi.org/10.1021/acs.jpcc.6b00903

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