Patent ID: 6329100
Filing Date: 2001-12-11
Classification: H01M,Y02E,Y10S

Abstract:
A hydrogen absorbing alloy electrode containing a first hydrogen absorbing alloy and a second hydrogen absorbing alloy both having a crystal structure of the CaCu5 type and represented by MmNi.sub.a Co.sub.b Al.sub.c M.sub.d wherein Mm is a misch metal, M is Mn and/or Cu, the atomic ratios a, b, c and d are in the respective ranges of 3.0.ltoreq.a.ltoreq.5.2, 0.ltoreq.b.ltoreq.1.2, 0.1.ltoreq.c.ltoreq.0.9, 0.1.ltoreq.d.ltoreq.0.8, wherein X is the sum of the atomic ratios a, b, c and d, such that, X=a+b+c+d, and is in the range of 4.4.ltoreq.X.ltoreq.5.4, the hydrogen absorbing alloy electrode being characterized in that the electrode contains a powder of the first hydrogen absorbing alloy wherein X is at least 5.0 and a powder of the second hydrogen absorbing alloy wherein X is less than 5.0.