Calcium/iron sulfide secondary cells. [Ca--Mg--Si]

Studies of calcium intermetallic compounds for use as negative electrodes in molten-salt calcium/iron sulfide cells are described. The binary intermetallics of Ca with Al, Mg, and Si did not have acceptable performance characteristics, but the ternary Ca--Mg--Si intermetallic performed satisfactorily in cell tests. These calcium cells are being developed for stationary-energy-storage and electric-vehicle applications. 6 figures, 2 tables.