H - Electricity – 01 – M
Patent
H - Electricity
01
M
319/81
H01M 4/34 (2006.01) H01M 4/06 (2006.01) H01M 4/54 (2006.01) H01M 6/12 (2006.01)
Patent
CA 1070759
ABSTRACT OF THE DISCLOSURE A primary alkaline cell having a stable divalent silver oxide depolarizer mix comprising a negative electrode (anode), a divalent silver oxide (AgO) depolarizer mix, a separator between said negative electrode and depolarizer mix, and an alkaline electrolyte. The surface of the depolarizer mix is treated with a mild reducing solution to form a reduced layer surroun- ding the mix, and the surface of the reduced layer adjacent to the separator is coated with a layer of silver. The reduced layer surrounding the depola- rizer mix in combination with the layer of silver provides improved stability of the depolarizer mix in the alkaline electrolyte and a single voltage pla- teau during discharge of the cell. The primary alkaline cell is characterized by a maximum open circuit voltage of about 1.75 volts. The silver layer on the surface of the reduced layer surrounding the depolarizer mix can be formed by treating the reduced layer with a strong reducing solution to form a subs- tantially continuous and electrolyte permeable silver layer, or alternatively, the silver layer may be formed by placing a silver screen, expanded silver metal, perforated silver foil or porous silver powder layer on top of the reduced layer surrounding the depolarizer mix and adjacent to the separator. It is preferred that the layer of silver be substantially continuous and electrolyte permeable which may be accomplished by treating the reduced layer surrounding the mix with a strong reducing solution. When forming the layer of silver by treating the reduced layer with a strong reducing solution, it is preferred that the depolarizer mix surrounded by the reduced layer be con- solidated in a cathode container prior to treating it with the strong reducing solution. The depolarizer mix may contain from about 50% by weight to about 100% by weight of divalent silver oxide based on the total silver oxide con- tent and still provide a cell with a single voltage plateau discharge.
266684
Buelow Carol
Megahed El S.
Spellman Patrick
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