Patent ID: 7820325

Claim:
An alkaline electrolyte storage battery comprising at least one anode that comprises an active material composition comprising: a)an alloy capable of forming a hydride, of formula R 1-y Mg y Ni t-z M Z in which R is La, optionally substituted by Nd and/or Pr, M is at least one element chosen from the group comprising Mn, Fe, Al, Co, Cu, Zr and Sn, 0.1−y≦0.4, 3.2≦t≦3.5, z≦0.5, and of which the equilibrium hydrogen pressure with the alloy, for a hydrogen insertion into the alloy of 0.5H/Metal at 40° C. is less than 0.7 bar; b) a yttrium-based compound in a mixture with alloy a).