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concentration change necessaryto pass the liquidus curve of the phase diagram. The electrode behavior upon cathodic polarization is further complicated by dendrite growth which causes the electrode to expand into the melt. The feasibility of an aluminum chloride battery in the primary mode was experimentally demonstrated. INTRODUCTION A great deal of effort--over the past 7 years has been directed toward the development of batteries with energy densities &the order of 200 W-hr/lb. The negatives in these high energy density systems are characteristically selected from the most electronegativeof the metals. The use of electronegative metals such as Li or Na necessitates the use of electrolytes which are aprotic. Organic and molten salt media have both been used; however, since aprotic organic electrolytes can be used at ambient temperatures, these have received by far the greater amount of attention. Major disadvantages of cells based on aprotic organic electrolytes are instability of positive plates (resulting in short-shelf life) and low conductivity. The chief disadvantage of molten electrolyte batteries being presently investigated is the necessity for high temperature operation which introduces many problems relating to materials of construction, safety, etc. Furthermore,theinsulation needed tokeep these high temperature batteries in an operating condition leadsto a degradation of-the energy densityof the battery. It seems possibleto overcome the problems associatedwith the high working temperatures of the present molten salt systems, while still retaining the advantagesof high energy density and relatively efficient electrode processes, by using a cell composed of an A1 negative and a C12 positive in a low temperature electrolyte of molten AIClg-NaC1-KC1. The operating temperature of this system would be in the range 120 to 150 "C, with a theoretical energy density of 650 W-hr/lb. Furthermore, it should 2PDF Image | ALUMINUM CHLORINE BATTERY
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