Method for producing a negative electrode material comprising an active phase consisting of a material M based on Al, Si, Sn, Sb or a mixture thereof, the material M being in the metallic form and presenting an oxidation state of 0, and an electrochemically inactive 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, selected from B III, Al III, Si IV, Ge Iv, P V, Sb V, S VI or a combination thereof; X is a cation with oxidation degree d = 1, 2, 3, 4 or 5, selected from the alkaline elements, alkaline earth elements, transition elements having oxidation degree between 1 and 5, elements p having oxidation degree 3 or 5, or a combination thereof, X ensuring the electroneutrality of X a Y b O c; and wherein: 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, said interface consisting of the elements M, X, Y and 0, the element M being, in said interface, at an oxidation degree different from zero; said method comprising the following steps: - mixing of the oxide precursors of X and Y; - first heat treatment of the mixture of oxide precursors of X and Y carried out at a temperature of 100 to 1200°C, for a period of 2 to 12 hours in order to obtain the material X a Y b O c; - cooling then grinding of the material X a Y b O c obtained; - mixing of the ground material X a Y b O c obtained with the active phase M, M being in the metallic form and presenting an oxidation state of 0; - second heat treatment carried out under non-oxidizing atmosphere for the material M and at a temperature below the melting point of the material X a Y b O c and sufficiently high so that the material M reacts chemically with X a Y b O c to form said interface between said active phase and said support phase and thereby to obtain said negative electrode material, said second heat treatment being carried out at a temperature of 100 to 1200°C, for a period of 2 to 12 hours, under inert atmosphere; and - cooling of said negative electrode material obtained. O is an oxygen; Y is a cation with oxidation degree m = 3, 4, 5 or 6, selected from B III, Al III, Si IV, Ge Iv, P V, Sb V, S VI or a combination thereof; X is a cation with oxidation degree d = 1, 2, 3, 4 or 5, selected from the alkaline elements, alkaline earth elements, transition elements having oxidation degree between 1 and 5, elements p having oxidation degree 3 or 5, or a combination thereof, X ensuring the electroneutrality of X a Y b O c; and wherein: 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, said interface consisting of the elements M, X, Y and 0, the element M being, in said interface, at an oxidation degree different from zero; said method comprising the following steps: - mixing of the oxide precursors of X and Y; - first heat treatment of the mixture of oxide precursors of X and Y carried out at a temperature of 100 to 1200°C, for a period of 2 to 12 hours in order to obtain the material X a Y b O c; - cooling then grinding of the material X a Y b O c obtained; - mixing of the ground material X a Y b O c obtained with the active phase M, M being in the metallic form and presenting an oxidation state of 0; - second heat treatment carried out under non-oxidizing atmosphere for the material M and at a temperature below the melting point of the material X a Y b O c and sufficiently high so that the material M reacts chemically with X a Y b O c to form said interface between said active phase and said support phase and thereby to obtain said negative electrode material, said second heat treatment being carried out at a temperature of 100 to 1200°C, for a period of 2 to 12 hours, under inert atmosphere; and - cooling of said negative electrode material obtained. c is such that 2 ≤ c ≤ 10; b is such that 1 ≤ b ≤ 4; and a = (2c-bm)/d; - mixing of the oxide precursors of X and Y; - first heat treatment of the mixture of oxide precursors of X and Y carried out at a temperature of 100 to 1200°C, for a period of 2 to 12 hours in order to obtain the material X a Y b O c; - cooling then grinding of the material X a Y b O c obtained; - mixing of the ground material X a Y b O c obtained with the active phase M, M being in the metallic form and presenting an oxidation state of 0; - second heat treatment carried out under non-oxidizing atmosphere for the material M and at a temperature below the melting point of the material X a Y b O c and sufficiently high so that the material M reacts chemically with X a Y b O c to form said interface between said active phase and said support phase and thereby to obtain said negative electrode material, said second heat treatment being carried out at a temperature of 100 to 1200°C, for a period of 2 to 12 hours, under inert atmosphere; and - cooling of said negative electrode material obtained.