Positive active material for electric primary cells

Details Positive active material for electric primary cells Positive active material for electric primary cells

1977-12-29

1978-11-14

LeFevour, Charles F.

Chemistry: electrical current producing apparatus, product, and

Current producing cell, elements, subcombinations and...

Include electrolyte chemically specified and method

429219, 2521821, H01M 604

Patent

active

041256891

ABSTRACT:
A positive active material for electric primary cells, such as are used in electronic watches, is formed from a powder composed at least partially of grains having cores of silver peroxide completely surrounded by a layer of monovalent silver oxide and covered with a thin surface layer of metallic silver. The remainder of the powder, if any, comprises monovalent silver oxide grains, also covered with a thin surface layer of metallic silver. A process for making the material includes adding a reducing agent such as hydrazine to a powder having grains of less than 50 microns in diameter of essentially pure silver peroxide and reducing the silver peroxide to the point at which a thin layer of metallic silver forms on the surface of each powder grain. This point can be detected by a substantial reduction in electrical resistivity of the powder and occurs when approximately one-half of the original powder remains as silver peroxide.

REFERENCES:
patent: 4009056 (1977-02-01), Megahed et al.
patent: 4015056 (1977-03-01), Megahed et al.
patent: 4038467 (1977-07-01), Lippold et al.
patent: 4048405 (1977-09-01), Megahed

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