Chemistry: electrical current producing apparatus – product – and – Sealed cell having gas prevention or elimation means – Prevention or elimination means is one of the cell...
Patent
1997-02-19
1999-10-05
Ip, Sikyin
Chemistry: electrical current producing apparatus, product, and
Sealed cell having gas prevention or elimation means
Prevention or elimination means is one of the cell...
429101, 429223, 429224, 420900, 420582, 420584, 420587, 420588, 148442, 204293, H01M 1030, H01M 438
Patent
active
059621567
ABSTRACT:
A nickel-metal hydride storage battery having a high capacity and excellent cycle life is disclosed. The battery employs, as its material for the negative electrode, a hydrogen storage alloy powder having a composition represented by the general formula Zr.sub.1-x M3.sub.x Mn.sub.a Mo.sub.b Cr.sub.c M1.sub.d M2.sub.e Ni.sub.f, where M1 represents at least one element selected from the group consisting of V, Nb and rare earth elements, M2 represents at least one element selected from the group consisting of Fe, Co and Cu, and M3 represents at least one element selected from the group consisting of Ti and Hf, and where 0.ltoreq.x.ltoreq.0.3, 0.3.ltoreq.a.ltoreq.0.7, 0.01.ltoreq.b.ltoreq.0.2, 0.05.ltoreq.c.ltoreq.0.3, 0.ltoreq.d.ltoreq.0.1, 0.ltoreq.e.ltoreq.0.2, 0.8.ltoreq.f.ltoreq.1.3, and 1.6.ltoreq.a+b+c+d+e+f.ltoreq.2.2, and wherein said hydrogen storage alloy has at least one of a Laves phase having a crystal structure of the MgCu.sub.2 -type (C15) and a Laves phase having a crystal structure of the MgZn.sub.2 -type (C14), and wherein a sum of integrated intensities of diffraction peaks other than those attributed to the presence of said Laves phase is not more than 5% of a sum of integrated intensities of all diffraction peaks in a diffraction angle 2.theta. of 10.degree. to 80.degree. in a powder X-ray diffraction pattern by Cu K.alpha. radiation.
REFERENCES:
patent: 4946646 (1990-08-01), Gamo et al.
patent: 5468309 (1995-11-01), Seri et al.
Izumi Yoichi
Moriwaki Yoshio
Tokuhiro Takashi
Yamashita Katsumi
Ip Sikyin
Matsushita Electric - Industrial Co., Ltd.
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