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Title: Overcharge tolerant high-temperature cells and batteries

Abstract

In a lithium-alloy/metal sulfide high temperature electrochemical cell, cell damage caused by overcharging is avoided by providing excess lithium in a high-lithium solubility phase alloy in the negative electrode and a specified ratio maximum of the capacity of a matrix metal of the negative electrode in the working phase to the capacity of a transition metal of the positive electrode. In charging the cell, or a plurality of such cells in series and/or parallel, chemical transfer of elemental lithium from the negative electrode through the electrolyte to the positive electrode provides sufficient lithium to support an increased self-charge current to avoid anodic dissolution of the positive electrode components above a critical potential. The lithium is subsequently electrochemically transferred back to the negative electrode in an electrochemical/chemical cycle which maintains high self-discharge currents on the order of 3-15 mA/cm.sup.2 in the cell to prevent overcharging.

Inventors:
 [1];  [2]
  1. (Downers Grove, IL)
  2. (Wheaton, IL)
Issue Date:
Research Org.:
Argonne National Laboratory (ANL), Argonne, IL
OSTI Identifier:
867044
Patent Number(s):
4849309
Assignee:
United States of America as represented by United States (Washington, DC) ANL
DOE Contract Number:  
W-31109-ENG-38
Resource Type:
Patent
Country of Publication:
United States
Language:
English
Subject:
overcharge; tolerant; high-temperature; cells; batteries; lithium-alloy; metal; sulfide; temperature; electrochemical; cell; damage; caused; overcharging; avoided; providing; excess; lithium; high-lithium; solubility; phase; alloy; negative; electrode; specified; ratio; maximum; capacity; matrix; transition; positive; charging; plurality; series; parallel; chemical; transfer; elemental; electrolyte; provides; sufficient; support; increased; self-charge; current; avoid; anodic; dissolution; components; critical; potential; subsequently; electrochemically; transferred; cycle; maintains; self-discharge; currents; 3-15; cm; prevent; temperature electrochemical; anodic dissolution; discharge current; provides sufficient; metal sulfide; positive electrode; negative electrode; electrochemical cell; transition metal; damage caused; chemical cycle; phase alloy; electrode provides; high-temperature cells; charge current; cell damage; excess lithium; temperature cells; discharge currents; /429/

Citation Formats

Redey, Laszlo, and Nelson, Paul A. Overcharge tolerant high-temperature cells and batteries. United States: N. p., 1989. Web.
Redey, Laszlo, & Nelson, Paul A. Overcharge tolerant high-temperature cells and batteries. United States.
Redey, Laszlo, and Nelson, Paul A. Sun . "Overcharge tolerant high-temperature cells and batteries". United States. https://www.osti.gov/servlets/purl/867044.
@article{osti_867044,
title = {Overcharge tolerant high-temperature cells and batteries},
author = {Redey, Laszlo and Nelson, Paul A.},
abstractNote = {In a lithium-alloy/metal sulfide high temperature electrochemical cell, cell damage caused by overcharging is avoided by providing excess lithium in a high-lithium solubility phase alloy in the negative electrode and a specified ratio maximum of the capacity of a matrix metal of the negative electrode in the working phase to the capacity of a transition metal of the positive electrode. In charging the cell, or a plurality of such cells in series and/or parallel, chemical transfer of elemental lithium from the negative electrode through the electrolyte to the positive electrode provides sufficient lithium to support an increased self-charge current to avoid anodic dissolution of the positive electrode components above a critical potential. The lithium is subsequently electrochemically transferred back to the negative electrode in an electrochemical/chemical cycle which maintains high self-discharge currents on the order of 3-15 mA/cm.sup.2 in the cell to prevent overcharging.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {1989},
month = {1}
}

Patent:

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