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ALUMINUM CHLORINE BATTERY By JosgCiner and Gerhard L, Holleck Tyco Laboratories, Inc. Waltham, Massachusetts 02154 SUMMARY The purification procedure for described in our earlier reports, was modified by producing finely divided A1 in situ in order to reduce the ionic iron con- tent of the melt before evaporation of the AlC13. Measurements of electrolyte conductivity were made in the ternary melt. The temperature dependence of the specific conductivity from 25 to 185"Cin the A1C13-KC1-NaCl melt (57.5-12.5-30 mol %) can be represented by The currents at the A1 electrode were limited almost solely by mass trans- port, as was shown by studies at a rotating disk electrode. The electrode processes were further investigated by galvanostatic, current step methods. It was found that the charge transfer step at the A1 electrode was quite fast, and that the observed overvoltages were mainly due to concentration polarization. The apparent exchange current, io at 130 O C was determined.to be 268 mA/cm2, and the average double layer capacity was found to be 40 ~ .Fl /cm2 INTRODUCTION The aim of the present contract is to show both the potential and the problems inherent in a molten salt system based on an A1 anode and Cl2 cathode in an A1C13- alkali chloride melt ( which we have prepared) e This system offers promise as a re- chargeable, high energy density battery. To obtain pure A1C13 -KCl-NaCl melts, different commercial aluminum chlo- ride materials have been investigated, FeC13 was found to be the major impurity in all of them. A procedure involving treatment of a melt of high AlC13 concentration -1-PDF Image | NASA ALUMINUM CHLORINE BATTERY
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