LITHIUM ANODE LIMITED CYCLE BATTERY INVESTIGATION.
Quarterly technical progress rept. no. 5,
LOCKHEED MISSILES AND SPACE CO INC PALO ALTO CA MATERIALS SCIENCES LAB
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The purpose of this experimental program is to develop technology sufficient to construct batteries based on the lithium-cupric fluoride or lithium-cobaltic fluoride electrochemical couples. Two sources of cupric fluoride were evaluated which gave different voltage plateaus when used in cathodes and discharged in cell tests. There were slight differences between the two materials in crystal structure and chemical composition. Additional drying of the cupric fluoride before preparation into cathodes, or the addition of water to the cells changed the discharge voltage plateaus of cells on tests. Although dry propylene carbonate was shown to have little solubility for cupric fluoride, the addition of lithium perchlorate to the solvent increased the cupric fluoride solubility considerably, particularly with increasing water content. Cells discharged at 72 C have utilization efficiencies similar to those discharged at 25 C but may be discharged at higher current densities 10 mAsq in.. Useful discharged were obtained -20 C, the limit of present testing, at lower current densities. A standard weight of 2.5 gsq in. of cupric fluoride was selected for cathode preparation for both test cells and 25 A-hr cells. The heavier cathodes had fair utilization at the present time and were selected as a step in optimizing 25 A-hr cell design. Author
- Electrochemical Energy Storage