H - Electricity – 01 – M
Patent
H - Electricity
01
M
319/32, 319/4
H01M 8/06 (2006.01) H01M 4/86 (2006.01) H01M 6/20 (2006.01) H01M 10/39 (2006.01) H01M 12/08 (2006.01)
Patent
CA 1054671
ALKALI METAL/SULFUR CELL WITH GAS FUEL CELL ELECTRODE ABSTRACT OF THE DISCLOSURE An improved alkali metal/sulfur cell is disclosed of the type including: (A) at least one anodic reaction zone containing a molten alkali metal reactant-anode in electrical contact with an external circuit; (B) at least one cathodic reaction zone including an electrode of porous conductive material and in which, during discharge of the cell, cations of the alkali metal combine with polysulfide or sulfur-saturated polysulfide ions to form reduced alkali metal polysulfide salts which at least partially fill said porous conductive material; and (C) a cation-permeable barrier to mass liquid transfer interposed between and in contact with said anodic and cathodic reaction zones, said porous conductive material being in electrical contact with both said cation-permeable barrier and said external circuit. The improvement comprises adapting the cathodic reaction zone to operate as a gas fuel cell electrode by employing a sulfur storage chamber containing molten sulfur connected with said cathodic reaction zone so as to allow sulfur vapors to pass therebetween, the storage chamber being adapted to be maintained at a temperature (i) above the temperature of said cathodic reaction zone when said cell is being discharged such that sulfur distills into said cathodic reaction zone and (ii) below the tempera- ture of said cathodic reaction zone when the cell is being charged such that sulfur vapor condenses in said storage chamber. The application also relates to a process for reducing alkali metal polysulfide salts to form elemental alkali metal using said cell. - 1 -
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