| 简介 |
PROBLEM TO BE SOLVED : To provide an alkali storage battery having high-output power (regeneration characteristic) and high-level durability performance at low cost.
SOLUTION : The alkali storage battery has an electrode group and an alkali electrolytic solution in an exterior can, provided that the electrode group has : a nickel positive electrode including nickel hydroxide as a primary positive electrode active material; a hydrogen-absorbable alloy negative electrode including a hydrogen-absorbable alloy as a negative electrode active material; and a separator. In the nickel positive electrode, zinc is added to the nickel hydroxide serving as the primary positive electrode active material; the content of the zinc is 8 mass% or less to the mass of nickel in the positive electrode active material. The hydrogen-absorbable alloy is expressed by the general formula, LaxReyMg1-x-yNin-aMa, where Re is at least one element selected from the group consisting of rare earth elements except La; M is at least one element selected from the group consisting of Al, Co, Mn and Zn; and x/y is 0.4 or larger. In the alkali electrolytic solution, a compound of tungsten or the like is added thereto; the content of the compound is between 0.5 and 2.0 mass% inclusive to the mass of the positive electrode active material.
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