Physical chemistry of molten-salt batteries. Final report, 1 October 1980-September 1981. Current-induced composition gradients in molten LiCl-KCl

Technical Report · Fri Oct 01 04:00:00 EDT 1982

DOI:https://doi.org/10.2172/6857606· OSTI ID:6857606

Vallet, C. E.; Heatherly, D. E.; Braunstein, J.

Current-induced composition gradients have been predicted in mixed molten salt battery electrolytes. Composition shifts, if large enough, can produce significant deleterious effects, such as solid phase precipitation in or near the electrodes of molten salt batteries, including the LiAl/LiCl-KCl/FeS/sub x/ battery. Quantitative measurements are needed to determine the extent of the gradients and to find means to reduce them. This report presents the first quantitative SEM/EDX measurements with high distance resolution (<50 ..mu..m) of the shape of the composition profile in LiCl-KCl electrolyzed between LiAl electrodes. Also, current-induced precipitation of LiCl in a porous LiAl anode is indicated by SEM/EDX examination. The measured compositions are consistent with predictions from mass transport models based on the electrode reactions, migrational and diffusional mobilities. 5 figures, 4 tables.

• Research Organization: Oak Ridge National Lab., TN (USA)
• DOE Contract Number: W-7405-ENG-26
• OSTI ID: 6857606
• Report Number(s): ORNL/TM-8489; ON: DE83001684
• Country of Publication: United States
• Language: English

Related Subjects

25 ENERGY STORAGE
250903* -- Energy Storage-- Batteries-- Materials
Components
&amp; Auxiliaries
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400400 -- Electrochemistry
ABSORPTION SPECTROSCOPY
ALKALI METAL COMPOUNDS
CHEMICAL ANALYSIS
CHEMICAL COMPOSITION
CHLORIDES
CHLORINE COMPOUNDS
CURRENTS
DATA
ELECTRIC BATTERIES
ELECTRIC CURRENTS
ELECTROCHEMICAL CELLS
ELECTROLYSIS
ELECTROLYTES
ELECTRON MICROSCOPY
EXPERIMENTAL DATA
HALIDES
HALOGEN COMPOUNDS
INFORMATION
LITHIUM CHLORIDES
LITHIUM COMPOUNDS
LITHIUM HALIDES
LITHIUM-SULFUR BATTERIES
LYSIS
METAL-NONMETAL BATTERIES
MICROSCOPY
MOLTEN SALTS
NONDESTRUCTIVE ANALYSIS
NUMERICAL DATA
POTASSIUM CHLORIDES
POTASSIUM COMPOUNDS
SALTS
SCANNING ELECTRON MICROSCOPY
SPECTROSCOPY
X-RAY EMISSION ANALYSIS
X-RAY FLUORESCENCE ANALYSIS