Elektrode aus Wasserstoff absorbierender Legierung

摘要

A hydrogen-absorption alloy electrode includes, as a principal material, particles of a hydrogen-absorption alloy containing a rare earth element, Ni, Co, Al and Mn and leads to reduced deviation in battery characteristics after charging/discharging cycles by having the size distribution of the alloy particles limited such that d90/d10 ≤ 8 and d90-d10 ≤ 50 mu m, where di (where i varies from 0 to 100) means a particle size at which cumulative size frequency with respect to the entire particles is i%. The alloy particles are constructed such that on the surface of the alloy particles, at least one of the following relationships holds: (the amount of Al on the surface/the amount of Al in the alloy) < (the amount of Co on the surface/the amount of Co in the alloy); (the amount of Mn on the surface/the amount of Mn in the alloy) < (the amount of Co on the surface/the amount of Co in the alloy); and (the amount of Al+Mn on the surface/the amount of Al+Mn in the alloy) < (the amount of Co on the surface/the amount of Co in the alloy).