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Analysis of secondary lithium cells with sulfur dioxide based electrolytes

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4 Author(s)
McDonald, R.C. ; Yardney Tech. Products Inc., Pawcatuck, CT, USA ; Harris, P. ; Hossain, S. ; Goebel, F.

Recent developments in lithium rechargeable cells using liquid SO 2-based electrolyte have led to the demonstration of 100-200 cycles at practical energy densities of over 100 Wh/kg in flat-plate cells. Analytical studies were conducted to confirm the discharge mechanism and to explore the effects of using various cycling voltage limits in Li/CuCl2 cells. These cells have excellent shelf-life potential and can utilize either a copper chloride cathode or, with appropriate choice of high surface area carbon and electrolyte composition, the SO2 itself can provide the cathode material. Experimental cells with a flat electrode design were used to study the cell chemistry and cycling performance. The behavior of Li/CuCl2 cells cycled with various voltage limits is summarized. To gain an understanding of how materials interact in Li/CuCl2 cells, hermetically sealed glass cells were prepared containing cell components in various combinations. These materials were soaked at room temperature for three weeks and examined with X-ray diffraction, scanning electron microscopy, energy dispersive spectroscopy, and chemical analyses for the presence of copper. The results are given. Some design considerations which affect safety and performance in Li/SO2 cells were also investigated

Published in:

Power Sources Symposium, 1992., IEEE 35th International

Date of Conference:

22-25 Jun 1992

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