Failure Mechanisms in Sealed Batteries.
Semiannual technical rept. no. 5, 1 Jul-31 Dec 68,
BATTELLE MEMORIAL INST COLUMBUS OH COLUMBUS LABS
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Procedures are given for the laboratory fabrication of electrodes for alkaline nickel-cadmium and silver-zinc rechargeable cells. Test data on cells undergoing life tests on simulated synchronous and polar orbitals are presented. Definitions of failure, failure mode, failure determinant, and failure mechanisms are developed for greater clarity and for relevancy to failed cells and batteries. A revised failure analysis procedure to enable one to arrive at the failure determinant of a nickel-cadmium cell is recommended. Also, a procedure for more complete chemical and physical analysis of sealed nickel-cadmium cells is outlined for characterizing the contents of commercial cells. New experimental work to determine the solubilities of silver oxide, conductivities, densities, and freezing points of electrolytes, containing KOH, K2CO3, Ag2O, and ZnO to simulate actual conditions within sealed silver-zinc cells, is under way. Measurements will be made at four temperatures from -25C to 40C. New thermal conductivity and resistance measurements of sealed nickel-cadmium cells and their components are reported to show that thermal networks can be deduced for predicting thermal conductivities. The results of these thermal measurements were applied to the design of both cells and batteries as a means for minimizing temperature gradients. Author
- Electrochemical Energy Storage