Development of overcharge tolerance in Li/FeS and Li/FeS/sub 2/ cells

Conference · Fri Jan 01 00:00:00 EST 1988

OSTI ID:6896200

Kaun, T D; Holifield, T F; Nigohosian, M; Nelson, P A

An innovative application of a self-discharge mechanism for molten-electrolyte Li-alloy/FeS/sub x/ cells has led to the development of overcharge-tolerant cells. Conventional Li-alloy/FeS/sub x/ battery cells require an electronic charger/equalizer. Two versions of the cell have been demonstrated: LiAl+10 Mol% Li/sub 5/Al/sub 5/Fe/sub 2//LiCl-LiBr-KBr (BN, MgO)/FeS/sub 2/ (operated at 400/degree/C) and LiAl+10 mol% Li/sub 5/Fe/sub 2//LiF-LiCl-LiBr(MgO)/FeS (operated at 475/degree/C). These cells exhibit a unique combination of overcharge capacity and extended trickle-charge tolerance at 2--5 mA/cm/sup 2/. The basis for the self-discharge is diffusion of reduced lithium species across the separator by a lithium-shuttle mechanism that is controlled by the Li-activity of the Li-alloy electrode. A bimodal self-discharge rate (a 20-fold increase toward the end of charge) results from a 150--250 mV step increase in Li-activity. Cells having overcharge tolerance have operated with stable performance for greater than 200 cycles. The overcharge tolerance rates are sufficient for battery cells to exhibit built-in charge/equalization capability. 11 refs., 6 figs.

• Research Organization: Argonne National Lab., IL (USA)
• DOE Contract Number: W-31109-ENG-38
• OSTI ID: 6896200
• Report Number(s): CONF-881061-10; ON: DE89003952
• Resource Relation: Conference: Electrochemical Society fall meeting, Chicago, IL, USA, 9 Oct 1988; Other Information: Portions of this document are illegible in microfiche products
• Country of Publication: United States
• Language: English

Related Subjects

25 ENERGY STORAGE
BATTERY CHARGING
TOLERANCE
CAPACITY
ELECTRIC BATTERIES
ELECTRIC DISCHARGES
ELECTRODES
IRON SULFIDES
LITHIUM ALLOYS
NUMERICAL DATA
ALLOYS
CHALCOGENIDES
DATA
ELECTROCHEMICAL CELLS
INFORMATION
IRON COMPOUNDS
SULFIDES
SULFUR COMPOUNDS
TRANSITION ELEMENT COMPOUNDS
250900* - Energy Storage- Batteries