Stable iron disulfide secondary cell with LiCl-LiBr-KBr electrolyte

Conference · Wed Jan 01 00:00:00 EST 1986

OSTI ID:5034943

Kaun, T D

Results of innovations in the Li-Al/FeS/sub 2/ cell are reported. This cell incorporates two major changes from earlier cells of this type: a novel electrolyte, 25 mol % LiCl-37 mol % LiBr-38 mol % KBr (mp 310/sup 0/C) and a high loading density (2.4 Ah/cm/sup 3/) for the FeS/sub 2/ electrode, which is then operated only on its higher voltage plateau (1.75 avg. V vs LiAl). This cell design is designated ''dense upper-plateau (U.P.) FeS/sub 2/ cell'' to distinguish it from the conventional ''two-plateau (T.P.) FeS/sub 2/ cell.'' Prismatic bicells (24 to 48 Ah capacity) of 100 cm/sup 2/ separator area (BN felt) were fabricated for evaluating performance and cycle life. Cycle life testing was conducted at 397/sup 0/C with a 4-h discharge rate (50 mA/cm/sup 2/) and 8-h charge rate (25 mA/cm/sup 2/). For these conditions, the first cell exhibited 89% utilization of the U.P. FeS/sub 2/ electrode capacity, and the voltage/capacity characteristics of the U.P. FeS/sub 2/ electrode continued to show virtually no change after 400 cycles (5400 h) of operation. The energy density of this U.P. FeS/sub 2/ cell is enhanced as a result of approximately 50% higher utilization of cell capacity and a 10% higher average discharge voltage at 50 mA/cm/sup 2/ than a comparable T.P. FeS/sub 2/ cell. Specific power at 80% depth of discharge (DOD) is also enhanced by approximately 100% because the cell voltage at that point in the discharge is about 0.3 V higher than that of the T.P. FeS/sub 2/ cell with much lower internal cell resistivity.

• Research Organization: Argonne National Lab., IL (USA)
• DOE Contract Number: W-31-109-ENG-38
• OSTI ID: 5034943
• Report Number(s): CONF-8604116-7; ON: DE87001576
• Resource Relation: Conference: International workshop on high temperature molten salt batteries, Argonne, IL, USA, 16 Apr 1986
• Country of Publication: United States
• Language: English

Related Subjects

25 ENERGY STORAGE
METAL-NONMETAL BATTERIES
PERFORMANCE TESTING
ALUMINIUM ALLOYS
CURRENT DENSITY
ELECTROLYTES
IRON SULFIDES
LITHIUM ALLOYS
LITHIUM BROMIDES
LITHIUM CHLORIDES
POTASSIUM BROMIDES
ALKALI METAL COMPOUNDS
ALLOYS
BROMIDES
BROMINE COMPOUNDS
CHALCOGENIDES
CHLORIDES
CHLORINE COMPOUNDS
ELECTRIC BATTERIES
ELECTROCHEMICAL CELLS
HALIDES
HALOGEN COMPOUNDS
IRON COMPOUNDS
LITHIUM COMPOUNDS
LITHIUM HALIDES
POTASSIUM COMPOUNDS
SULFIDES
SULFUR COMPOUNDS
TESTING
TRANSITION ELEMENT COMPOUNDS
250901* - Energy Storage- Batteries- Design & Development