Relationship between composition of the electrolyte solutions and energetic performance of 1.5 V non-aqueous cells of lithium/iron sulfide system

• Published in: Journal of power sources 1993-04, Vol.44 (1), p.355-362
• Main Authors: Werblan, L., Bak̵owska, A., Izydorek, J., Downarowicz, J., Polszakiewicz, B., Szcześniak, B., Sza̵pka, R., Walas, I.
• Format: Article
• Language: English
• Subjects: Applied sciences; Direct energy conversion and energy accumulation; Electrical engineering. Electrical power engineering; Electrical power engineering; Electrochemical conversion: primary and secondary batteries, fuel cells; Exact sciences and technology
• ISSN: 0378-7753; 1873-2755
• DOI: 10.1016/0378-7753(93)80175-O

Seven electrolyte solutions in equimolar solvent mixtures or in one-component solvents have been selected on the basis of own results of research and on literature data: LiAsF 6 in GBL+1,2-DME; LiClO 4 in GBL+1,2-DME; LiClO 4 in GBL+2-MeTHF; LiAsF 6 in PC; LiClO 4 in PC; LiAsF 6 in AN+PC, and LiClO 4 in AN. They were the basis for constructing seven series of the miniaturized coin-types R43 lithium cells with the Li/FeS electrode system. Relationship between composition of the electrolyte solutions and energy performance of the cells was studied for over 4800 h (200 days). The open-circuit voltage (emf) and the discharge curves (voltage U versus time t) were determined for two load values R = 100 kΩ and R = 22 kΩ. The practical electric charge capacity Q p, the practical energy capacity E p, the weights of the spent electrode materials (lithium m Li and iron sulfide m FeS), the practical specific energy E ps, the electric charge and energy efficiency coefficients, η Qp, η Eps, were calculated. The best practical specific energy E ps has been obtained by cells with the solution of LiAsF 6 in equimolar mixture AN+PC.