Overdischarge protection in high-temperature cells and batteries

Details Overdischarge protection in high-temperature cells and batteries Overdischarge protection in high-temperature cells and batteries

1989-07-25

1990-06-19

Skapars, Anthony

Chemistry: electrical current producing apparatus, product, and

Process of cell operation

429112, 429218, 429221, 429223, H01M 1039, H01M 1044

Patent

active

049353160

ABSTRACT:
Overdischarge indication and protection is provided in a lithium alloy - metal sulfide, secondary electrochemical cell and batteries of such cells through use of a low lithium activity phase that ordinarily is not matched with positive electrode material. Low lithium activity phases such as Li.sub.0.1 Al.sub.0.9 and LiAlSi in correspondence with positive electrode material cause a downward gradient in cell voltage as an indication of overdischarge prior to damage to the cell. Moreover, the low lithium activity phase contributes lithium into the electrolyte and provides a lithium shuttling current as overdischarge protection after all of the positive electrode material is discharged.

REFERENCES:
patent: 3957532 (1976-05-01), Settle et al.
patent: 4079303 (1978-03-01), Cox
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
U.S. patent application Ser. No. 227,021, filed Aug. 1, 1988, allowed Feb. 6, 1989.
Redey, "Chemical Overcharge/Overdischarge Protection for Li-Alloy/Transition Metal Monosulfide Cells", Presentation at the Electrochemical Society, Inc. Symposium, Oct. 1988.

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