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Sulfur-Based Lithium-Organic Electrolyte Secondary Batteries.
Quarterly rept. no. 6, 4 Mar 75-3 Jun 75,
EIC INC NEWTON MASS
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This program is aimed at developing a rechargeable organic-electrolyte lithium battery to operate over the range -40 to 160F, have an energy density approaching 100 Whrlb, a cycle life in excess of 500, and high charge retention. The approach is to use positive electrodes based on higher sulfides of Nb, Ti and V. Ti disulfides and trisulfides were prepared thermally. Both sulfides are electrochemically active and show similar overall behavior. Charge-discharge cycles in PC and methyl acetate LiALCl4, LiCl04 electrolytes are characterized by relatively flat voltage plateaus with mid-discharge potentials of 2.OV. The discharge cutoff potential, the sulfide preparation, and the solvent appear to affect the cycling behavior. Charge and discharge reactions of TiS2 electrodes are relatively rapid. Diffusion of Li ions in the sulfide and the electrolyte appear to be rate limiting.
APPROVED FOR PUBLIC RELEASE