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Title: Overdischarge protection in high-temperature cells and batteries

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. 8 figs.
Authors:
Publication Date:
OSTI Identifier:
7022958
Report Number(s):
US 4935316; A
PPN: US 7-384604
DOE Contract Number:
W-31109-ENG-38
Resource Type:
Patent
Resource Relation:
Patent File Date: 25 Jul 1989
Country of Publication:
United States
Language:
English
Subject:
25 ENERGY STORAGE; BATTERY CHARGE STATE; MONITORING; EQUIPMENT PROTECTION DEVICES; DESIGN; METAL-NONMETAL BATTERIES; ACTIVATION ENERGY; ALUMINIUM ALLOYS; INTERMETALLIC COMPOUNDS; LITHIUM ALLOYS; PHASE STUDIES; SILICON ALLOYS; VOLTAGE DROP; ALLOYS; ELECTRIC BATTERIES; ELECTROCHEMICAL CELLS; ENERGY 250903* -- Energy Storage-- Batteries-- Materials, Components, & Auxiliaries