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Open AccessArticle

Large Planar Na-β″-Al2O3 Solid Electrolytes for Next Generation Na-Batteries

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Laboratory for High Performance Ceramics, Empa, Swiss Federal Laboratories for Materials Science and Technology, Ueberlandstrasse 129, 8600 Duebendorf, Switzerland
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Materials for Energy Conversion, Empa, Swiss Federal Laboratories for Materials Science and Technology, Ueberlandstrasse 129, 8600 Duebendorf, Switzerland
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Author to whom correspondence should be addressed.
Materials 2020, 13(2), 433; https://doi.org/10.3390/ma13020433
Received: 17 December 2019 / Revised: 13 January 2020 / Accepted: 14 January 2020 / Published: 16 January 2020
(This article belongs to the Special Issue Production and Processing of High Performance Ceramic)
Large diameter (> 100 mm) planar Na-β″-Al2O3 solid electrolytes (BASE) with thickness from 1.0 to 1.5 mm have been prepared. Na-β″-Al2O3 was processed as a slurry and cast to give several meters of tape. One hundred and forty mm diameter discs were punched from the tape, stacked, and laminated with a large hydraulic press. Binder burnout and sintering were performed in 150 mm diameter MgO spinel encapsulations to mitigate the loss of Na2O vapor. Conductivity and flexural strength were measured on smaller Na-β″-Al2O3 samples produced via the same tape casting process followed by sintering and gave results consistent with BASE materials produced by uniaxial pressing of powders. Planar BASE membranes enable new cell designs, which are predicted to have higher power densities and better stacking efficiency compared to currently manufactured tubular cells. View Full-Text
Keywords: molten-salt batteries; sodium batteries; tape casting; planar cell; Na-β″-Al2O3 molten-salt batteries; sodium batteries; tape casting; planar cell; Na-β″-Al2O3
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Ligon, S.C.; Bay, M.-C.; Heinz, M.V.F.; Battaglia, C.; Graule, T.; Blugan, G. Large Planar Na-β″-Al2O3 Solid Electrolytes for Next Generation Na-Batteries. Materials 2020, 13, 433.

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