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 NaAlCl4 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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ChemInform Abstract A high energy density cell operating at 250 rc C has been developed employing a liquid Na anode, a beta alumina electrolyte, and a novel solid-state cathode consisting of a partially chlorinated porous iron matrix impregnated with NaAlCl4 molten electrolyte. This cell has the feature that all of the cathode reactants, i.e., Fe, FeCl2, and NaCl, are insoluble in the NaAlCl4 electrolyte and therefore remain in intimate contact with each other and the current collector. The reversibility of the cell reaction is demonstrated and considerable progress is achieved in optimization of the cathode. The cell has a specific energy of ≥ 130 Wh/kg at the 5 h rate, an open-circuit voltage of 2.35 V at 250 rc C, long life ( > 1000 cycles), and a high degree of safety.