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The studies carried out during the last two decades on the sodium-sulfur electrochemical system showed that the ceramics based on sodium-containing beta-alumina are most suitable for producing the cell separators and the solid electrolytes of the storage batteries owing to the exceptionally high conductivity with respect to the sodium ions [i]. In such elements, the solid electrolyte is usually used in the form of long thin-walled ceramic tubes.The material of the solid electrolyte must be absolutely resistant to the aggressive environment at high temperatures and must possess sufficiently high strength characteristics. It was established that the density, the microstructure, the chemical composition, and the phase constitution of the ceramic electrolyte have a significant effect on its ionic conductivity, mechanical properties, and efficiency.

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