Electrochemical cell

Details Electrochemical cell Electrochemical cell

1986-06-11

1989-01-03

Niebling, John F.

Chemistry: electrical current producing apparatus, product, and

Fluid active material or two-fluid electrolyte combination...

Active material in molten state

429103, 429107, H01M 1039

Patent

active

047956852

ABSTRACT:
The invention provides a method of protecting an electrochemical cell which has a molten sodium anode, a chloride-ion containing sodium aluminum halide molten salt electrolyte, an iron-containing cathode in contact with the electrolyte and a solid conductor of sodium ions which separates the anode from the electrolyte, from the adverse effects of overcharging. The method comprises operating the cell, to prevent oxidation of iron to FeCl.sub.3 in the cathode, by connecting it in parallel with a protective cell having an open circuit charging plateau at a voltage less than the open circuit voltage of the Fe/FeCl.sub.3 //Na plateau of the cell being protected, and greater than the open circuit voltage, in its fully charged state, of the cell being protected. The invention also provides a cell of this type protected in this fashion, a battery including one or more such protected cells, and a cathode for such cells.

REFERENCES:
patent: 3302091 (1967-01-01), Henderson
patent: 3877984 (1975-04-01), Werth
patent: 4287271 (1981-09-01), Coetzer et al.
patent: 4288506 (1981-09-01), Coetzer et al.
patent: 4529676 (1985-07-01), Galloway et al.
patent: 4546055 (1985-10-01), Coetzer et al.
patent: 4592969 (1986-06-01), Coetzer et al.

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