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US 4,541,172 AGranted
Iodide treatment of manganese dioxide
AssigneeUnion Carbide Corporation
InventorWilliam P. Evans
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Abstract
A process for producing iodide-treated manganese dioxide which displays reduced abnormal initial open circuit voltage and decreased undesirable degradative reactions with cell components when employed in electrochemical cells.
Claims5
A process for the manufacture of galvanic cells having a cathode comprising manganese dioxide, said process comprising the steps:
- (a) treating manganese dioxide with an aqueous solution of at least one iodide compound selected from the group consisting of alkali metal iodides, alkaline earth metal iodides, ammonium iodide, aluminum iodide, and mixtures thereof to form a reaction mixture and surface reacting the manganese dioxide with the iodide compound until I.sub.3.sup.- ions are present in the reaction mixture thereby indicating that superactive acidic sites on the surface of the manganese dioxide have been inactivated;
- (b) forming the treated manganese dioxide into a cathode;
- and
- (c) inserting said cathode along with an anode and electrolyte into a cell housing.
1 more element
Dependencies are inferred from the claim text.