| 简介 |
PROBLEM TO BE SOLVED : To provide : an alkali storage battery which is improved in its initial output characteristic while keeping the high-temperature charging efficiency at least equal to a conventional one, and which allows the suppression of the reduction in output characteristic after having worn; and an alkali storage battery system with such an alkali storage battery used therein.
SOLUTION : The alkali storage battery has, in its exterior can, an electrode group and an alkaline electrolyte. The electrode group includes : a sintered nickel positive electrode including nickel hydroxide as a primary positive electrode active material; a negative electrode; and a separator. The sintered positive electrode contains at least one element selected from rare earth elements including yttrium. Representing in a form of the ratio to nickel in the positive electrode active material, the content of the at least one element is 0.1 mass% or lower. The sintered positive electrode includes 0.15-0.65 mass% of at least one element selected from tungsten, molybdenum and niobium in a form of the ratio to nickel in the positive electrode active material.
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