Morphological studies on the Li-Al electrode in fused salt electrolytes
Well-functioning Li-Al electrodes in Li-Al/FeS cells have an open, coral-like structure. Occasionally, a coalesced zone develops that is believed to cause a decline in capacity. Comparative morphology experiments suggest that ..beta..-Li-Al, as well as ..cap alpha..-Li-Al, is involved in the development of coalescence in Li-Al electrodes operating in fuse salt electrolytes. The course of developing coalescence is viewed as a sintering process; it is hypothesized that there is a contribution to this process from electrochemically formed diffusive pathways that develop between particles of ..beta..-Li-Al. Local overpotential is regarded as important in forming these pathways. A significant impact on the rate of coalescence is expected from the high lithium vacancy concentration and chemical diffusion coefficient in ..beta..-Li-Al. There is a clear correlation between coalescence and charging of the electrode. Variation of current density and electrolyte composition alone did not, within the range of the experiments, prevent coalescence.
- Research Organization:
- Argonne National Laboratory, Chemical Engineering Division, Argonne, Illinois
- DOE Contract Number:
- W-31-109-ENG-38
- OSTI ID:
- 5623659
- Journal Information:
- J. Electrochem. Soc.; (United States), Vol. 130:1
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
37 INORGANIC
ORGANIC
PHYSICAL AND ANALYTICAL CHEMISTRY
ALUMINIUM ALLOYS
MORPHOLOGY
ELECTRODES
ELECTROLYTES
ELECTROCHEMISTRY
IRON SULFIDES
LITHIUM ALLOYS
METAL-NONMETAL BATTERIES
CURRENT DENSITY
CHEMICAL COMPOSITION
COALESCENCE
DIFFUSION
SINTERING
ALLOYS
CHALCOGENIDES
CHEMISTRY
ELECTRIC BATTERIES
ELECTROCHEMICAL CELLS
FABRICATION
IRON COMPOUNDS
SULFIDES
SULFUR COMPOUNDS
TRANSITION ELEMENT COMPOUNDS
250903* - Energy Storage- Batteries- Materials
Components
& Auxiliaries
400400 - Electrochemistry