Improved Li/BCX Primary Cells for Space Applications

Li/BCX (bromine chloride in thionyl chloride) primary cells have been qualified for flight aboard the space shuttle for over fifteen years. These cells provide high energy density while maintaining an excellent safety record. Recently, changes to the electrolyte have resulted in an improved Li/BCX II system with a lower self-discharge rate. The use of low molarity electrolytes in programs unique to NASA have improved the safety hazards tolerance of these cells while maintaining or increasing their energy density.