Positive electrode active material for alkaline storage batteries
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United States of America Patent
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Jul 17, 2001
Grant Date -
N/A
app pub date -
Jul 3, 1997
filing date -
Sep 20, 1996
priority date (Note) -
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Abstract
Disclosed is a high capacity positive active material for an alkaline storage battery comprising a nickel based multi-metals oxide, wherein the charge characteristic at high temperature is improved. This oxide has a large number of micropores in at least a surface layer. An average composition of the surface layer is different from that of the interior in that at least one element selected from the group consisting of Ca, Ti, Zn, Sr, Ba, Y, Cd, Co, Cr, Bi and lanthanoids, in addition to Ni, is contained in the surface layer, or in that the at least one element is contained at a concentration higher than that of the interior.
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