Stability of sodium electrodeposited from a room temperature chloroaluminate molten salt
- Georgia Inst. of Tech., Atlanta, GA (United States). School of Chemical Engineering
Room temperature molten salts consisting of 1-methyl-3-ethylimidazolium chloride (MEIC) and aluminium chloride (AlCl{sub 3}) have been examined as possible electrolytes for a room temperature design of the sodium/iron(II) chloride battery. This work examines the conditions required to achieve efficient reduction and oxidation of sodium from a sodium chloride buffered, neutral melt. Two substrates were examined, tungsten and 303 stainless steel, using both cyclic voltammetry and chronopotentiometry. Melts were protonated using a closed electrochemical cell to allow quantification of the effect of dissolved HCl on the efficiency of the sodium couple. A threshold of approximately 6 Torr HCl partial pressure was observed for sodium plating-stripping. Below this threshold, the sodium couple was not observed. The results, show that the sodium plating-stripping efficiency increases with increasing current density; however, the efficiency reaches a maximum and is adversely affected by high over potentials and extended exposure of the sodium to the melt. It appears that some passivation occurs as even a very thin layer of plated sodium exhibits a steady open-circuit voltage over long periods in the melt.
- Sponsoring Organization:
- USDOE
- OSTI ID:
- 153681
- Journal Information:
- Journal of the Electrochemical Society, Vol. 142, Issue 11; Other Information: PBD: Nov 1995
- Country of Publication:
- United States
- Language:
- English
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