Coating processes – Particles – flakes – or granules coated or encapsulated – Inorganic base
Patent
1997-03-07
1998-11-17
Beck, Shrive
Coating processes
Particles, flakes, or granules coated or encapsulated
Inorganic base
427123, 4271266, 427212, 427216, 427318, 427319, 4273831, 4273837, 148513, B05D 700, B05D 302, B05D 312, B05D 512
Patent
active
058373179
ABSTRACT:
The present invention provides a method of producing a hydrogen storage alloy low in cobalt content which can restrains a decrease in cycle life characteristic and preservation characteristic of an alkaline storage battery when the alloy is used as a negative electrode. The method includes the following steps. An Mm-Ni system hydrogen storage alloy which has a crystal structure of CaCu.sub.5 and contains 15 atom % or less of cobalt is powdered to have an average particle diameter of 10-100 .mu.m. Then, the powdered alloy is immersed in a treatment solution at 80.degree.-130.degree. C., the treatment solution comprising an alkaline aqueous solution containing 10 g/l or more of lithium hydroxide and having a specific gravity of 1.1 or higher, and cobalt ions which is contained in the alkaline aqueous solution, thereby forming a layer containing nickel and cobalt in higher concentration than in the bulk of the powdered alloy onto the alloy surface.
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Izumi Yoichi
Kaiya Hideo
Moriwaki Yoshio
Yamamura Yasuharu
Barr Michael
Beck Shrive
Matsushita Electric - Industrial Co., Ltd.
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