The present invention relates to a high-performance secondary battery sodium / sulfur battery or sodium / nickel chloride battery, more specifically, a solid electrolyte (3) to selectively move only sodium ions, located in the solid electrolyte (3) therein It consists of an anode containing molten sulfur or nickel chloride in a core conductor (4) into which sodium is injected and the solid electrolyte (3), and the molten sulfur or nickel chloride is contained in a current conductor having pores. It is contained in the container (1), the sodium is operated as a negative electrode, the external terminal of the negative electrode and the external terminal of the positive electrode is insulated by an insulating material (6), the wick tube (4) has an opening formed in the bottom A lower part of which is supported by a protective tube stopper 9 formed with a protrusion so that the sodium flows out through the opening, and is an inverted sodium / sulfur cell or a nat A cerium / nickel chloride battery.
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