Journalartikel

Jahr der Veröffentlichung: 2016

Seiten: 8472-8481

Zeitschrift: Journal of Physical Chemistry C

Bandnummer: 120

Heftnummer: 16

ISSN: 1932-7447

eISSN: 1932-7455

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

Verlag: 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.

Harvard-Zitierstil: 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-Zitierstil: 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