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

Abstract

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.

Authors:
; ; ;
Publication Date:
Research Org.:
Argonne National Lab., IL (USA)
OSTI Identifier:
6896200
Alternate Identifier(s):
OSTI ID: 6896200; Legacy ID: DE89003952
Report Number(s):
CONF-881061-10; CONF-881061-10
ON: DE89003952
DOE Contract Number:
W-31109-ENG-38
Resource Type:
Conference
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
Subject:
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

Citation Formats

Kaun, T.D., Holifield, T.F., Nigohosian, M., and Nelson, P.A. Development of overcharge tolerance in Li/FeS and Li/FeS/sub 2/ cells. United States: N. p., 1988. Web.
Kaun, T.D., Holifield, T.F., Nigohosian, M., & Nelson, P.A. Development of overcharge tolerance in Li/FeS and Li/FeS/sub 2/ cells. United States.
Kaun, T.D., Holifield, T.F., Nigohosian, M., and Nelson, P.A. Fri . "Development of overcharge tolerance in Li/FeS and Li/FeS/sub 2/ cells". United States. doi:.
@article{osti_6896200,
title = {Development of overcharge tolerance in Li/FeS and Li/FeS/sub 2/ cells},
author = {Kaun, T.D. and Holifield, T.F. and Nigohosian, M. and Nelson, P.A.},
abstractNote = {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.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {Fri Jan 01 00:00:00 EST 1988},
month = {Fri Jan 01 00:00:00 EST 1988}
}

Conference:
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