Patent ID: 7648799
Filing Date: 2010-01-19
Classification: H01M,Y02E

Abstract:
1. A primary electrochemical cell comprising an aqueous alkaline electrolyte, a negative electrode in electrical contact with a negative casing, a positive electrode in electrical contact with a positive casing, an insulating gasket disposed between the negative casing and the positive casing, and a separator disposed between the negative electrode and the positive electrode; wherein: the positive electrode includes a first layer that is in electrical contact with the positive casing and comprises one or more silver-containing oxides, including a silver oxide; the positive electrode comprises two or more barrier layers disposed on the first layer between the first layer and the separator; the barrier layer adjacent the first layer comprises manganese dioxide or graphite or a combination thereof; and the barrier layer nearest the separator comprises one or more of nickel oxyhydroxide and a nickel oxyhydroxide-containing material.