Patent ID: 9105947
Filing Date: 2015-08-11
Classification: C01B,C22C,H01M,Y02E

Abstract:
1. An alkaline storage battery comprising: an electrode group including a hydrogen storage alloy negative electrode including negative electrode active material of a hydrogen storage alloy, a nickel positive electrode including positive electrode active material mainly containing nickel hydroxide, and a separator; an alkaline electrolyte; and an outer can housing the electrode group and the alkaline electrolyte, the hydrogen storage alloy including a composition expressed by a ratio of X/Y of the concentration ratio where X is Al/Ni % of aluminum to nickel in a surface layer and the concentration ratio where Y is Al/Ni % of aluminum to nickel in a bulk layer being 0.36 or more and 0.85 or less, and the hydrogen storage alloy negative electrode retaining the alkaline electrolyte in a retention amount, Z1, of 95 mg≦Z1≦125 mg per gram of the hydrogen storage alloy.