Chemistry: electrical current producing apparatus – product – and – Current producing cell – elements – subcombinations and... – Electrode
Patent
1976-03-15
1977-03-29
Mack, John H.
Chemistry: electrical current producing apparatus, product, and
Current producing cell, elements, subcombinations and...
Electrode
H01M 606
Patent
active
040150569
ABSTRACT:
A method for manufacturing a stable divalent silver oxide depolarizer mix wherein the mix is treated with a mild reducing solution of a reducing agent such as methanol followed by a treatment with a strong reducing solution of a reducing agent such as hydrazine to form a layer of silver on the surface of the depolarizer mix. The depolarizer mix is specially prepared for use in a primary alkaline cell which is discharged at a single voltage plateau, and the preliminary treatment of the mix with the mild reducing solution permits the incorporation of greater amounts of divalent silver oxide in the mix, thereby increasing the electrochemical capacity while still providing a single voltage plateau discharge. The treatment with the mild reducing solution generally requires soaking the mix in a solution containing a reducing agent for up to about 10 minutes and may be carried out at either room or elevated temperature. The subsequent treatment with a strong reducing solution may also require up to about 10 minutes at either room or elevated temperature, with the purpose to provide a substantially continuous and electrolyte permeable layer of silver on the surface of the depolarizer mix. The depolarizer mix is particularly adapted for use in a "button" cell construction, and it may contain from about 50% by weight to about 100% by weight of divalent silver oxide and still provide a cell with a single voltage plateau discharge.
REFERENCES:
patent: 3655450 (1972-04-01), Soto-Kiebs
Megahed El Sayed
Spellman Patrick Joseph
ESB Incorporated
Lefevour C. F.
Mack John H.
Rossi Anthony J.
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