Abstract
A high energy density cell operating at 250°C has been developed employing a liquid sodium anode, a beta alumina electrolyte, and a novel solid‐state cathode. The cathode consists of a partially chlorinated porous iron matrix, impregnated with a sodium ion conducting molten salt which acts as a pure electrolyte. The reversibility of the cell reaction has been proven and considerable progress has been made towards optimization of the cathode, demonstrating high energy and power density, long life (>1000 cycles), and a high degree of safety.
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