Electrochemical Behavior of Fe/FeX<sub>2</sub> Electrodes in AlX<sub>3</sub>-MX [X = Cl, Br; M = Li, Na, K] Molten Salts

The electrochemical behavior of Fe electrode has been studied in NaCl- or NaBr-saturated AlX3-MX [X = Cl, Br; M = Li, Na, K] melts at a temperature of 185°C. The passivation of Fe electrode was suggested from cyclic voltammetry and chronopotentiometry. The performance of the Fe/FeX2 positive electrode in AlCl3-AlBr3-KCl-NaCl-LiCl-NaBr melt was investigated at 120-250°C using a rechargeable cell Al/electrolyte/FeX2. The charge-discharge capacity of the Fe/FeX2 electrode depended upon the temperature.