Hydrogen Storage Alloy Powders Produced by a Reduction--Diffusion Process and Their Electrode Properties

Hydrogen storage alloy powders of rare-earth-based alloy--Ni systems (La--Ni, Mm--Ni--Co--Al, Mm--Ni--Co--Mn--Al; Mm = misch metal) were prepared by a reduction--diffusion process. The alloy powders were evaluated as a negative electrode in an Ni--metal hydride battery. The results are summarized as...

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Bibliographic Details
Published in:Journal of alloys and compounds 1992-06, Vol.192 (1-2), p.167-169
Main Authors: Takeya, K, Tsugita, T, Okajima, Y, Sakai, T, Miyamura, H, Kuriyama, N, Ishikawa, H, Uehara, I
Format: Article
Language:English
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Summary:Hydrogen storage alloy powders of rare-earth-based alloy--Ni systems (La--Ni, Mm--Ni--Co--Al, Mm--Ni--Co--Mn--Al; Mm = misch metal) were prepared by a reduction--diffusion process. The alloy powders were evaluated as a negative electrode in an Ni--metal hydride battery. The results are summarized as follows: (1) the alloy powder was obtained as fine particles of average particle diameter of approx 30 mu m with smooth surface; (2) the alloy powder had uniform composition with a crystal structure of the CaCu sub 5 type; (3) the alloy powder exhibited good hydrogen absorption--desorption properties. The pressure plateau was very flat, not needing heat treatment; and (4) the electrode properties of manganese-containing alloy powders were the same as those of alloys produced by a conventional induction melting and heat treatment process.
ISSN:0925-8388