Product Analysis of Lithium/Sulfur Dioxide Cells Discharged and Stored at High Temperature

Abstract

The distribution of discharge products in Li/SO~ cells discharged in the temperature range -20 ~ to + 90~ was studied. The amount of lithium dithionite and lithium thiosulfate recovered in the aqueous extracts of the carbon electrode was determined by iodometric titration. The results of chemical analysis indicated that lithium dithionite was the maj or discharge product recovered in the cathode extracts in the temperature range -20 ~ to +50~ However, cells discharged at 60~ or warmer exhibited a product distribution transition with increased levels of thiosulfate and correspondingly suppressed levels of dithionite. The ratio of dithionite and thiosulfate was also determined semiquantitatively by Raman spectroscopy. The chemical analysis of cells placed on high temperature storage revealed that the Li:SO2 stoichiometry may become unbalanced due to the consumption of SO2.) unless CC License in place (see abstract). ecsdl.org/site/terms_use address. Redistribution subject to ECS terms of use (see 152.14.136.77 ABSTRACTThe emission Mbssbauer technique is used to study the chemical structure of the interphase formed between a cobalt substrate and a polyimide coating. The results are interpreted to indicate that the coating is bonded to the cobalt substrate by means of carboxylate bonds with Co 2+ ions in the oxide film at the interface.) unless CC License in place (see abstract). ecsdl.org/site/terms_use address. Redistribution subject to ECS terms of use (see 152.14.136.77 Downloaded on 2015-04-10 to IP

The Effect of High‐Temperature on the Discharge Chemistry of Li / SO 2 Cells

“…The data from the two cells are in excellent agreement. The analytical method is more refined than the method (11) previously employed by Godin et al (3). The iodometric analysis does not distinguish between Li2S20~ and Li2SO3.…”

“…The analytical method (11) employed by Godin et al (3) was modified to account for the presence of sulfide. Standard solutions of mixtures of sulfur anions in oxygen-free 0.1M NaOH were also intermittently analyzed over a period of 14 h to ensure that no new sulfur species formed by reaction of the anions in solution.…”