Accession Number : ADD015121

Title :   Silver-Nickel Composite Cathodes for Alkaline Secondary Batteries.

Descriptive Note : Patent,Filed 16 Aug 89, patented 3 Sep 91,

Corporate Author : DEPARTMENT OF THE NAVY WASHINGTON DC

Personal Author(s) : Ferrando, William

Report Date : 03 Sep 1991

Pagination or Media Count : 4

Abstract : A method for producing lightweight silver-nickel composite electrodes by (1) infiltrating a graphite fiber plaque with a suspension of finely divide nickel powder in an aqueous solution of AgNO3; (2) drying the graphite fiber plaque to produce a coating of AgNO3 crystals and nickel particles on the surfaces of the graphite fibers; (3) heating the coated graphite fiber plaque at a temperature about the melting point of AgNO3 but below the decomposition temperature of AgNO3 until the AgNO3 melts and wets the nickel particle and the surfaces of the graphite fibers; and (4) heating the molten AgNO3 coated graphite fiber plaque at a temperature from the decomposition temperature of AgNO3 to about 600 C, until the AgNO3 decomposes to form a thin uniform silver metal coating over the nickel particles and the surfaces of the graphite fibers. The silver-nickel particle coated graphite plaques is electrochemically treated to convert the silver to silver active material (Ag2O2) and the nickel to nickel active material (Ni(OH)2).

Descriptors :   ALKALINE BATTERIES, CARBON FIBERS, DRYING, GRAPHITE, MATERIALS, NICKEL, PARTICLES, POWDERS, SILVER, STORAGE BATTERIES

Subject Categories : Inorganic Chemistry

Distribution Statement : APPROVED FOR PUBLIC RELEASE