Chemistry: electrical current producing apparatus – product – and – Process of cell operation
Patent
1988-08-01
1989-07-18
Walton, Donald L.
Chemistry: electrical current producing apparatus, product, and
Process of cell operation
429112, 429218, 429221, H01M 1044, H01M 1039
Patent
active
048493090
ABSTRACT:
In a lithium-alloy/metal sulfide high temperature electrochemical cell, cell damage caused by overcharging is avoided by providing excess lithium in a high-lithium solubility phase alloy in the negative electrode and a specified ratio maximum of the capacity of a matrix metal of the negative electrode in the working phase to the capacity of a transition metal of the positive electrode. In charging the cell, or a plurality of such cells in series and/or parallel, chemical transfer of elemental lithium from the negative electrode through the electrolyte to the positive electrode provides sufficient lithium to support an increased self-charge current to avoid anodic dissolution of the positive electrode components above a critical potential. The lithium is subsequently electrochemically transferred back to the negative electrode in an electrochemical/chemical cycle which maintains high self-discharge currents on the order of 3-15 mA/cm.sup.2 in the cell to prevent overcharging.
REFERENCES:
patent: 3957532 (1976-05-01), Settle et al.
patent: 4079303 (1978-03-01), Cox
patent: 4172926 (1979-10-01), Shimotake et al.
patent: 4238721 (1980-12-01), DeLuca et al.
patent: 4324846 (1982-04-01), Kaun et al.
patent: 4414093 (1983-11-01), Redey et al.
patent: 4728590 (1988-03-01), Redey
Redey et al, Investigation of Primary Li-SI/FeS.sub.2 Cells, ANL-87-6 (1987).
Redey, Power Performance of LiAlSi/(FeNi)S.sub.2 Cells, ANL-86-40, International workshop on High Temp. Molten Salt Batteries, pp. B-131 to B-137 (1986).
Gay et al, "Li-Alloy/FeS Cell Design and Analysis Report", ANL-84-93 (1985), pp. 5 and 37-38.
Chemical Technology Division Annual Tech. Report 1986, ANL- 87-19 p. 15.
Redey, Chemical Mechanism for Overcharge Protection in Lithium-Alloy/Metal Disulfide Cells, The Electrochemical Society-Joint International Symposium on Molten Salts, 1987.
Kaun et al, Lithium/Disulfide Battery R&D, 8th Battery and Electrochemical Contractors Conference 11/16-19/87.
Nelson Paul A.
Redey Laszlo
Fisher Robert J.
Glenn Hugh W.
Hightower Judson R.
The United States of America as represented by the United States
Walton Donald L.
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