ACTIVE MATERIAL FOR ALKALINE STORAGE BATTERY, NON-SINTERED TYPE NICKEL ELECTRODE AND BATTERY USING IT

摘要

PROBLEM TO BE SOLVED: To provide an active material with high use coefficient for an alkaline storage battery. SOLUTION: This active material is for an alkaline storage battery, and comprises a composite particle, which is produced by forming a coating layer of a sodium-containing cobalt compound on the surface of a substrate particle of nickel hydroxide particle forming solid solution with magnesium in 0.5-5.0 wt.% of magnesium to nickel in nickel hydroxide and either yttrium metal or an yttrium compound or both of them. The active material contains 0.05-5.0 wt.%, based on yttrium element, of the yttrium metal and/or the yttrium compound added to the nickel of the base particle.