Electrode for alkaline secondary battery and alkaline secondary battery

An electrode for an alkaline secondary battery, the electrode being included in an electrode assembly accommodated in a container of the alkaline secondary battery, comprising:

• a band-shaped core;
• and
• an electrode mixture layer supported by the core, wherein the electrode faces a gas generating electrode with a separator being sandwiched therebetween, the gas generating electrode generating gas during an ending portion of a charging period in which the alkaline secondary battery is charged, the electrode and the gas generating electrode being wound with the separator to form a spiral shape;
• wherein the electrode comprises:
• a first circumference portion corresponding to a single first innermost winding at a starting portion of the spiral shape of the electrode and having an outer surface only which faces the gas generating electrode,
• an intermediate circumference portion corresponding to a second and following windings of the spiral shape of the electrode except for a single last outermost winding of the electrode, the intermediate portion including an inner surface and an outer surface both of which face the gas generating electrode, and
• an outermost circumference portion corresponding to the single last outermost winding at an ending portion of the spiral shape of the electrode, the outermost circumference portion having an inner surface only which faces the gas generating electrode,
• wherein the electrode mixture layer includes hydrogen that develops a reaction consuming oxygen generated at the ending portion of the charging period, and the electrode mixture layer includes a hydrogen absorbing alloy that can absorb and/or release the hydrogen;
• wherein an amount of the hydrogen absorbing alloy per corresponding unit area of the supporting band-shaped core in the first circumference portion is more than an amount of the hydrogen absorbing alloy per corresponding unit area of the supporting band-shaped core in the intermediate circumference portion and more than an amount of the hydrogen absorbing alloy per corresponding unit area of the supporting band-shaped core in the outermost circumference portion;
• and
• wherein a ratio of the amount of the hydrogen absorbing alloy per unit area of the band-shaped core in the first circumference portion to the amount of the hydrogen absorbing alloy per unit area of the band-shaped core in the intermediate circumference portion is 112% to 130%.