Lithium/chalcogen secondary cells for components in electric vehicular-propulsion generating systems. Interim technical summary report No. 3, May 23--November 22, 1970. [Se--Tl and S--Tl mixtures, fabrication of paste electrolytes]

The immediate goals are the testing of single lithium/chalcogen cells followed by the testing of small (near 1 kW) batteries. Twenty-eight cells were tested during this reporting period. Tests of selenium--thallium and sulfur--thallium mixtures showed promise of achieving the required short-time peak power density and showed no indications of cathode-material transport to the anode. A procedure was developed for fabrication of 7.5-cm diameter paste electrolytes by the molten salt infiltration of disks pressed from pure powdered lithium aluminate. The important property of disks made by this procedure is the low permeability to helium.