Overdischarge protection in high-temperature cells and batteries

Patent · Tue Jun 19 00:00:00 EDT 1990

OSTI ID:7022958

Redey, L

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.

• DOE Contract Number: W-31109-ENG-38
• Assignee: Dept. of Energy, Washington, DC (United States)
• Patent Number(s): US 4935316; A
• Application Number: PPN: US 7-384604
• OSTI ID: 7022958
• Resource Relation: Patent File Date: 25 Jul 1989
• Country of Publication: United States
• Language: English

Related Subjects

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