Regensburg 2013 – wissenschaftliches Programm
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MM: Fachverband Metall- und Materialphysik
MM 9: Functional Materials - Battery Materials II
MM 9.3: Vortrag
Montag, 11. März 2013, 12:15–12:30, H26
A room-temperature sodium/oxygen battery — •Pascal Hartmann1, Conrad L. Bender1, Anna Katharina Dürr2, Jürgen Janek1, and Philipp Adelhelm1 — 1Institute of Physical Chemistry, Justus-Liebig-University Gießen, Gießen, Germany — 2BASF SE, BCI/E-M311, Ludwigshafen, Germany
In this work we discuss the charge/discharge characteristics of analog sodium/oxygen and lithium/oxygen cells that are built up by a metallic anode, liquid electrolyte, and a porous carbon cathode. Compared to the Li/O2 cell, the Na/O2 cell shows a superior performance, with a higher discharge capacity at higher current densities and in addition with significantly lower overpotential for the charging process. In addition to pure oxygen, the cells were also cycled under different gas mixtures. In addition to the electrochemical measurements, we characterized the discharge products cells using x-ray powder diffraction, Raman spectroscopy, x-ray photoelectron spectroscopy, and electron microscopy. We clarified the cell reactions and the origin for the high discrepancy in the electrochemical performance for lithium and sodium based oxygen batteries. In summary, we show that the charge/discharge characteristics in analog Li/O2 and Na/O2 batteries significantly differ from each other: In particular the sodium based cells show higher discharge capacities at higher current densities as well as lower overpotentials for the discharge and charge reaction.