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5. Investigation of the wetting behavior of Na and Na alloys on uncoated and coated Na-v''-alumina at temperatures below 150 °C

Author

Ahlbrecht, Katharina, Bucharsky, C., Holzapfel, Michael, Tübke, Jens, Hoffmann, M.J., and Publica

Subjects
Na-v""-alumina, wetting behavior, metallic coating, medium temperature, molten sodium
Abstract

Insufficient wetting of Na on Na-beta"-alumina is responsible for an increased interfacial polarization in Na-batteries if the operating temperature is below 270-300 A degrees C. In this study, Na alloys (Na-Sn, Na-Bi and Na-In) on the ceramic surface are examined on their capability to improve the wetting with molten sodium at medium temperatures and thereby enabling operation of the cell at temperatures in the range of 105 to 150 A degrees C. Metallic coatings with Bi or Sn confirm this improvement at a temperature of 115 A degrees C. The overpotential of a symmetrical Naa",Na-beta"-aluminaa",Na cell is determined by galvanostatic cycling and electrochemical impedance spectroscopy and then associated to contact angle measurements. As a result, both the alloys and the metallic coatings have a positive impact on wetting and reduction of the overpotential during galvanostatic cycling.

Published
2017

8. Solid State Electrolytes for Ambient and Middle Temperature Next Generation Electrochemical Storage Systems

Author

Ahlbrecht, Katharina, Holzapfel, Michael, Tübke, Jens, and Hoffmann, Michael J

Abstract

Solid state electrolytes are typically known for their utilization in high-temperature or stationary electrochemical energy storage systems. For practical applications as well as for next generation systems like sulfur or air cells, the solid state electrolyte (SSE) has to be stable, dense and flexible. The thickness therefore needs to be reduced to obtain an acceptable passive weight. The aim of this study is the demonstration of an innovative, flexible solid state electrolyte for future systems, and to calculate the impact of its thickness on the energy densities of various storage systems.

Published
2014
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