Title:
希土類金属-ニッケル系水素吸蔵合金及びその製造法、並びにニッケル水素2次電池用負極
Document Type and Number:
Japanese Patent JP3993890
Kind Code:
B2
Abstract:
A rare earth metal/nickel-base hydrogen absorbing alloy having a composition represented by formula (1): (R1-x Lx )(Ni1-y My )z , (wherein R represents La, Ce, Pr, or Nd; L represents Gd, Tb, Dy, Ho, Er, Tm, Yb, Lu, Y, Sc, Mg, or Ca; and M represents Co, Al, Mn, Fe, Cu, Zr, Ti, Mo, Si, V, Cr, Nb, Hf, Ta, W, B, or C; 0,01 ≤ x ≤ 0.1; 0 ≤ y ≤ 0.5; and 4.5 ≤ z ≤ 5.0), wherein the content of crystals with the number of reversed-phase boundaries present perpendicularly to the C axis of crystal grains in the alloy being 2 to less than 20 per 20 nm in the direction of the C axis is 10 to less than 95 vol.% and the amount of L in the formula (I) present in the reversed-phase region is 60 to less than 95 % of the amount of L added. The negative electrode for the nickel-hydrogen secondary battery can simultnaneously improve all of the initial activity, battery capacity, and battery life.
More Like This:
Inventors:
Akihito Kaneko
Application Number:
JP51012097A
Publication Date:
October 17, 2007
Filing Date:
August 28, 1996
Export Citation:
Assignee:
Santoku Co., Ltd.
International Classes:
C22C19/00; C22F1/10; H01M4/24; H01M4/38; C22F1/00
Attorney, Agent or Firm:
Hajime Sakai