The stability of the Li/SOCl/sub 2/ system at elevated temperatures

Conference · Sat Oct 01 04:00:00 EDT 1983 · Proc. - Electrochem. Soc.; (United States)

OSTI ID:6408320

Babal, M; Bayabigi, S; Bineth, J

The behavior of Li/SOCl/sub 2/, LiAlCl/sub 4//C system at temperatures up to 200 C was investigated using a specially designed D-size cell. It was found that the system is stable on storage at 200/sup 0/C (20/sup 0/C above the lithium melting point). Moreover the cells can be discharged at 200/sup 0/C for over 6 days while large portions of the available capacity were obtained. This distinct electrochemical stability was manifested by the capability of the cell to be discharged at 150/sup 0/C at a 6 months rate. The temperature variation curve of the open circuit potential (OCV) shows a minimum at 50-70/sup 0/C. At the lower branch of the curve, the decrease of OCV with increasing temperature was explained by the increasing of the anode corrosion reactions, while the OCV per se is determined by the presence of impurities in the electrolyte which are more oxidizing substances than thionyl chloride, e.g. Cl/sub 2/, SO/sub 2/Cl/sub 2/, S/sub 2/Cl/sub 2/ and SCl/sub 2/. On the other hand, at the higher temperature branch the OCV is determined mainly by more oxidizing than thionyl chloride substances formed by a reversible thermal decomposition reaction of thionyl chloride, e.g. Cl/sub 2/. Their increasing equilibrium concentrations at higher temperatures are manifested by a higher OCV. The electrochemical stability of the Li/SOCl/sub 2/ system confirms further the duplex structure of the LiCl passivation film present on the lithium surface.

• Research Organization: Lithium Batteries Plant, Tadiran, Israel Electronics Industries, Rehovot
• OSTI ID: 6408320
• Report Number(s): CONF-831086-
• Conference Information: Journal Name: Proc. - Electrochem. Soc.; (United States) Journal Volume: 84-1
• Country of Publication: United States
• Language: English

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25 ENERGY STORAGE
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