Patent ID: 8062561

Claim:
A negative electrode material comprising an active phase consisting of a material M based on a material selected from the group consisting of Al, Si, Sn, Sb and a mixture thereof, and an electrochemically active support phase consisting of a material X a Y b O c , wherein: O is an oxygen; Y is a cation with oxidation degree m=3, 4, 5 or 6; X is a cation with oxidation degree d=1, 2, 3, 4 or 5, X ensuring the electroneutrality of X a Y b O c ; and where: c is such that 2≦c≦10; b is such that 1≦b≦4; and a=(2c−bm)/d; an interface of mixed composition existing between the active phase and the support phase and formed by the material M reacting chemically with X a Y b O c , the said interface consisting of the elements M, X, Y and O, the material M being in a metallic form of the metal and presenting an oxidation state of 0.