Lithium Battery Research.
Annual rept. no. 1, 1 Apr 68-31 Mar 69,
BATTELLE MEMORIAL INST COLUMBUS OH COLUMBUS LABS
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This report describes results of a program which seeks to identify rechargeable lithium-metal halide couples and electrolytes for use therein. The first part of the present program included an evaluation of the existing literature and technology of lithium batteries. Applicable technology, components and electrodes were sought for later use in the fabrication program. This literature evaluation led to the identification of the need for a rechargeable metal halide electrode in a stable electrolyte that could supply the necessary halide ion for electrode reversibility. As a second part of this program, theoretical and experimental evaluations were made of more than 30 metal halide compounds as active cathode materials. Eighteen compounds were studied in one or more electrolytes each. Results lead to discovery of five metal halide-electrolyte systems as promising candidates for achieving rechargeable positive electrodes. These discoveries also required development of electrolytes for use in combination with the appropriate metal halide electrode. The three metal halides chosen from electrode screening work for continued study were 1 silver monofluoride, AgF 2 cupric fluoride, CuF2, and 3 cadmium chloride, CdCl2. The preferred electrolyte for the fluoride electrodes is a butyrolactone BL solvent containing cesium fluoride at 0.00196 molar solute. For the metal chloride, the preferred electrolyte is the BL solvent containing a solute mixture of magnesium chloride and lithium chloride in a molar ratio of 13. Author
- Electrochemical Energy Storage