| 摘要 |
PROBLEM TO BE SOLVED: To provide a sodium-sulfur battery capable of preventing breaking of a sold electrolyte tube, when the battery temperature falls at the end of charging and when the battery is overcharged. SOLUTION: The sodium-sulfur battery is provided with a closed-end cylindrical solid electrolyte tube 5, which is arranged into a closed-end cylindrical positive electrode container 1, and fused sodium Na is stored inside the solid electrolyte tube 5 as a negative electrode active material. A fused sulfur S is stored outside the solid electrolyte tube 5 as a positive electrode active material. On an outer periphery surface of the solid electrolyte tube 5, a high- resistance layer 12 composed of a fibrous or a granular insulating material is formed, so that the bottom is thicker than the side part, and a felt-like conductive material 13 is arranged on the lower part of the high-resistance layer formed on the bottom.
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