Overdischarge protection in high-temperature cells and batteries

Patent · Mon Jan 01 00:00:00 EST 1990

OSTI ID:867427

Redey, Laszlo ^[1]

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1. Downers Grove, IL

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.

• Research Organization: Argonne National Laboratory (ANL), Argonne, IL (United States)
• DOE Contract Number: W-31109-ENG-38
• Assignee: United States of America as represented by United States (Washington, DC)
• Patent Number(s): US 4935316
• OSTI ID: 867427
• Country of Publication: United States
• Language: English

Related Subjects

overdischarge
protection
high-temperature
cells
batteries
indication
provided
lithium
alloy
metal
sulfide
secondary
electrochemical
cell
activity
phase
ordinarily
matched
positive
electrode
material
phases
lialsi
correspondence
downward
gradient
voltage
prior
damage
moreover
contributes
electrolyte
provides
shuttling
current
discharged
cell voltage
metal sulfide
secondary electrochemical
positive electrode
electrochemical cell
electrode material
lithium alloy
high-temperature cells
charge prior
temperature cells
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