Patent ID: 6858347

Claim:
A nickel metal-hydride storage battery comprising a paste type positive electrode containing a first active material and a second active material, wherein said first active material comprises X parts by weight of particulate nickel hydroxide with aX/100 parts by weight of cobalt oxyhydroxide carried thereon, and said second active material comprises Y parts by weight of particulate nickel oxyhydroxide, of which an oxidation number of nickel is α, with bY/100 parts by weight of cobalt oxyhydroxide carried thereon, all the following relationships being satisfied: 2.6≦α2.92 (1) 0.01≦( aX /100 +bY /100)/( X+Y )≦0.20 (2) 0 <b≦a ≦10or 0 =b<a ≦10 (3) 2.1≦(2 X+αY )/( X+Y )<2.2; (4) and wherein an oxidation number of cobalt in said cobalt oxyhydroxide included in said first active material and said second active material is greater than 3.