Evaluation of LiCl-LiBr-KBr electrolyte for Li-alloy/metal disulfide cells

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

OSTI ID:6127076

Kaun, T D

The physical properties of a new molten salt electrolyte for lithium-alloy/metal disulfide cells, 25 mol % LiCl-37 mol % LiBr-38 mol % KBr, were investigated. Cyclic voltammetry of FeS/sub 2/ in the new molten salt at 375 to 425/sup 0/C indicated improved electrochemistry and stability of the reaction on the upper voltage plateau (1.75 V vs. LiAl). The new electrolyte provides an opportunity to operate an upper-plateau (UP) FeS/sub 2/ electrode at a lower temperature, 400/sup 0/C, and with a higher activity of lithium ion in the electrolyte. The broad liquidus of this molten salt at 400/sup 0/C also supports operation at high current density. Testing of 24- to 48-Ah cells indicated greater than 50% improved energy and power density over the conventional two-plateau FeS/sub 2/ cell with LiCl-KCl electrolyte. The conventional FeS/sub 2/ cells would lose 50% of their upper-plateau capacity within 200 cycles. The elimination of this capacity decline problem was demonstrated by 400 cycles and 5400 h of stable operation with a dense UP FeS/sub 2/ electrode cell, which maintained 89% utilization of theoretical capacity throughout the test.

• Research Organization: Argonne National Lab., IL (USA)
• DOE Contract Number: W-31109-ENG-38
• OSTI ID: 6127076
• Report Number(s): CONF-871027-25; ON: DE87011356
• Country of Publication: United States
• Language: English

Related Subjects

25 ENERGY STORAGE
250903* -- Energy Storage-- Batteries-- Materials
Components
& Auxiliaries
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400400 -- Electrochemistry
ALKALI METAL COMPOUNDS
ALLOYS
BROMIDES
BROMINE COMPOUNDS
CHALCOGENIDES
CHEMISTRY
CHLORIDES
CHLORINE COMPOUNDS
ELECTRIC BATTERIES
ELECTROCHEMICAL CELLS
ELECTROCHEMISTRY
ELECTROLYTES
HALIDES
HALOGEN COMPOUNDS
HIGH TEMPERATURE
IRON COMPOUNDS
IRON SULFIDES
LITHIUM ALLOYS
LITHIUM BROMIDES
LITHIUM CHLORIDES
LITHIUM COMPOUNDS
LITHIUM HALIDES
MOLTEN SALTS
PERFORMANCE TESTING
PHYSICAL PROPERTIES
POTASSIUM BROMIDES
POTASSIUM COMPOUNDS
SALTS
SULFIDES
SULFUR COMPOUNDS
TESTING
TRANSITION ELEMENT COMPOUNDS
VOLTAMETRY