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. ALUMINUM CHLORINE BATTERY By Josg Giner and Gerhard L. Holleck Tyco Laboratories, Inc. Waltham,Massachusetts 02154 SUMMARY A molten salt system basedon A1 and C12 carbon electrodes with an A1C13-alkali chloride eutecticas electrolyte offers promise as a rechargeable, high energy density battery which can operate a1 a relatively low temperature and may withstand sterilization. To obtain pure A1Cl3-KC1-NaC1 melts, different commercial aluminum chloride 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 A1C13 concentration with magnesium powder prior to evaporation yielded pure AlC13.A1C13-KC1-NaC1 melts using this material stayedclear (nearly colorless), and showed practically no background current. Investigations of vitreous.carbon electrodes have shown that carbon is intrinsically active for chlorine reduction in A1C13-alkali ' chloride melts. A study of compatibility of carbon electrodes for chlorine in A1C13 eutectics has uncovered carbon samples which appear suited for the constructionof porous chlorine cathodes. Passivation phenomena have been observedupon cathodic and anodic polarization of the aluminum electrode in A1Cl3-KC1-NaC1 melts. It was established that they are not due to an electrochemical (potential dependent) process, but rather are caused by formation of a solid salt layer at the electrode surface resulting from concentration changes upon anodic or cathodic current flow. The value of the steady state current is determined by diffusion processes inthe melt and by the 1 .iPDF Image | ALUMINUM CHLORINE BATTERY
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