Patent ID: 7943255

Claim:
A method of manufacturing a hydrogen-absorption alloy electrode which comprises particles of a hydrogen-absorption alloy that comprises a rare earth element, Ni, and Co, wherein the method comprises providing particles having a size distribution such that d90/d10≦8 and d90−d10≦50 μm, where di (where i varies from 0 to 100) means a particle size at which a cumulative size frequency with respect to the entire particles is 1%, and subjecting the particles to an alkaline treatment in a NaOH solution under a boiling condition for 0.5 hours or longer, and wherein the hydrogen-absorption alloy further comprises Al and the particles are subjected to the alkaline treatment such that on a surface of the particles (amount of Al on surface/amount of Al in alloy)<(amount of Co on surface/amount of Co in alloy).