Sealed Primary Lithium-Inorganic Electrolyte Cell.
Quarterly rept. no. 10, 1 Jun 76-31 Aug 76,
MALLORY (P R) AND CO INC BURLINGTON MASS LAB FOR PHYSICAL SCIENCE
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The LiSOCl2 hermetic D cell developed by P. R. Mallory and Co. Inc. met or exceeded all the initial objectives such as E. D. of 150 WHrlb at thrity hours rate and a peak power density of 50 wattslb and the storage and operating temperature of -40 to 160 C. The two major deficiencies exhibited by the cells were explosion hazard on abuse and voltage delay on storage. Both the problems were studied in detail and considerable progress has been made in both the above areas. During the last quarter, we continued the SEM studies of the Li that was found to be responsible for the voltage delay. We obtained LiCl film growth rate curves for the Li samples stored in the electrolytes containing various salt concentrations and additives at 72, 55 and 25 C. We found that the growth rates were substantially reduced by reducing the salt concentration. Also the addition of SO2 caused the LiCl film to grow in a more orderly fashion. We plan to examine the effect of these electrolyte variables on the voltage delay of the practical hermetic LiSOCl2D cells during the next quarter. We have set up a DTA apparatus for doing differential thermal analysis of the various chemicals present in a fresh andor partially discharged LiSOCl2D cell. Preliminary data obtained so far indicate that it is possible to distinguish between pressure bursts and a thermal runaway by this method.
- Physical Chemistry
- Electrochemical Energy Storage