Electrochemical cell

Details Electrochemical cell Electrochemical cell

1981-09-17

1983-10-18

Walton, Donald L.

Chemistry: electrical current producing apparatus, product, and

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

Active material in solution

429196, H01M 616

Patent

active

044106092

ABSTRACT:
There is provided a novel primary cell which comprises in combination an anode made of lithium, of sodium or of a dischargeable alloy of same, which has a melting point above 80.degree. C., an electrolyte comprising a solvent or solvent mixture which is suited to dissolve a polysulfide to attain a concentration of at least 0.01 M, and to dissolve an electrolyte salt to give a solution of at least 0.1 M, said solvent or solvent system having an own EMF against the anode which is low enough so as not to prevent the reaction of the anode material with said polysulfide to form a M.sub.2 S solid electrolyte interphase, said electrolyte containing a polysulfide M.sub.2 S.sub.n where M is selected from lithium and sodium, the concentration of the polysulfide being high enough and n being low enough to result in a predetermined low selfdischarge of the cell, and an inert porous current collector. The current collector may be charged with sulfur. The solvent system may contain a solvent which reduces the solubility of the polysulfide, thus increasing the conductivity of the electrolyte.

REFERENCES:
patent: 3907591 (1975-09-01), Lauck
patent: 3915743 (1975-10-01), Lauck
patent: 4018969 (1977-04-01), Fischer
patent: 4238553 (1980-12-01), Weddigen

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