Overcharge protection in Li-alloy/metal disulfide cells

Conference · Thu Jan 01 04:00:00 EST 1987

OSTI ID:6127226

Redey, L

Charge and overcharge reactions of FeS/sub 2/, NiS/sub 2/, and (Fe-Ni)S/sub 2/ electrodes were studied in half-cell and full-cell experiments to investigate the electrochemical stability of these materials at high charge potentials. In Li/sub 2/S-saturated (LiCl-KCl, LiF-LiCl-LiBr, and LiCl-LiBr-KBr) electrolytes, a new plateau appeared at 2.05-2.1 V vs Li-Al and was associated with polysulfide anion formation. The polysulfide seems to stabilize the transition-metal sulfides against overcharge-related dissolution, even at 2.2 V. The anodically formed polysulfide provides overcharge tolerance for Li-alloy/MS/sub 2/ cells by an electrochemical-chemical sulfide/polysulfide cycle.

• Research Organization: Argonne National Lab., IL (USA)
• DOE Contract Number: W-31109-ENG-38
• OSTI ID: 6127226
• Report Number(s): CONF-871027-26; ON: DE87011364
• Country of Publication: United States
• Language: English

Related Subjects

25 ENERGY STORAGE
250900* -- Energy Storage-- Batteries
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400400 -- Electrochemistry
ALKALI METAL COMPOUNDS
ALLOYS
BATTERY CHARGERS
BATTERY CHARGING
CHALCOGENIDES
CHEMICAL REACTIONS
CHEMISTRY
ELECTRIC BATTERIES
ELECTROCHEMICAL CELLS
ELECTROCHEMISTRY
ELECTRODES
ELECTROLYTES
IRON COMPOUNDS
IRON SULFIDES
LITHIUM ALLOYS
LITHIUM COMPOUNDS
LITHIUM SULFIDES
NICKEL COMPOUNDS
NICKEL SULFIDES
SULFIDES
SULFUR COMPOUNDS
TRANSITION ELEMENT COMPOUNDS