Hydridable alloy

An active electrochemical material is made of a monophase hydride alloy with a calcium copper structure, of a specified formula. An active electrochemical material is made up of a monophase hydride alloy with a calcium copper (CaCu5) structure, with a formula (I): where Mm is a mischmetal containing at least 50% b.w of La and with the following characteristics: (1) 5.10 is less than or equal to (a+b+c+d+e); (2) d is less than or equal to 0.55; and (3) 0.03 is less than or equal to e and e is less than or equal to 0.1. Independent claims are included for the following: (a) a method of fabricating this active electrochemical material; (b) an electrode incorporating this material; and (c) a secondary electrochemical generator incorporating such a negative electrode. La présente invention a pour objet une matière électrochimiquement active constituée d'un alliage hydrurable monophasé de structure CaCu5, de formule Mm Nia Mnb Alc Cod Cre, où Mm est un mischmetal contenant au moins 50% en poids de La, avec 5,10