Patent ID: 6338917
Filing Date: 2002-01-15
Classification: H01M,Y02E

Abstract:
An alkaline storage battery comprising a positive electrode having an active material comprising mainly nickel oxide powders, a negative electrode, a separator, and an alkaline electrolyte,wherein (i) an electrically conductive material is coated on the surface of said nickel oxide powders, (ii) said nickel oxide powders are connected with each other through an electrically conductive network, and (iii) said coating of electrically conductive material comprises a material which increases an oxygen overvoltage, said material which increases an oxygen overvoltage being uniformly dispersed throughout the coating of electrically conductive material and/or in the vicinity of the surface of the coating of electrically conductive material, and wherein said material which increases the oxygen overvoltage is a metal and/or an oxide thereof comprising at least one element selected from the group consisting of Ca, Ti, Nb, Cr, Y, and Yb; wherein said electrically conductive material comprises mainly metallic Co and/or Co oxide; and wherein said alkaline electrolyte comprises (i) mainly aqueous potassium hydroxide solution, and (ii) sodium hydroxide in an amount of 5-50% by weight based on said potassium hydroxide.