Novel process for preparing a spinel type lithium manganese...

C - Chemistry – Metallurgy – 01 – G

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C01G 45/00 (2006.01) C01G 49/00 (2006.01) C01G 51/00 (2006.01) C01G 53/00 (2006.01) H01M 4/48 (2006.01) H01M 4/50 (2006.01)

Patent

CA 2287256

An improved process for preparing a spinel type lithium manganese composite oxide represented by the general formula (I): LixMn(2-y)My1By2O4 wherein M represents at least one member selected from among Al, Cr, Fe, Ni, Co, Ga, and Mg; 0.9 x1.1; and y = y1 + y2, wherein 0.002y0.5, 0y1 < 0.5, and 0.002y20.1 or represented by the general formula (Ia) LixMn(2-y)MyO4, which is the same as the general formula (I) except that y2 is 0. In formula (Ia) M and x are each as defined above and 0.002 y0.5; and a cathode active material for a lithium ion rechargeable battery comprising the spinel type lithium manganese composite oxide having improved charge-discharge characteristics produced by the above method. The composite oxide thus produced is a novel one improved in cycle characteristics, particularly in charge-discharge cycle characteristics in a high-temperature (50 ~C or above) environment, and hence is very useful from the viewpoint of industry.

L'invention porte sur un procédé amélioré de préparation d'un oxyde composite lithium-manganèse du type spinelle représenté par la formule générale Li¿x?Mn¿(2-y)?M¿y1?B¿y2?O¿4? (dans laquelle M représente au moins un élément sélectionné parmi Al, Cr, Fe, Ni, Co, Ga et Mg; 0,9?x?1,1; et y = y¿1? + y¿2?, où 0,002?y?0,5, 0?y¿1? < 0,5, et 0,002?y¿2??0,1), ou représenté par la formule générale (Ia) Li¿x?Mn¿(2-y)?M¿y?O¿4? identique à la formule générale (I) excepté que y¿2? vaut 0. Dans ladite formule (Ia) M et x sont tels que précités et 0,002?y?0,5. L'invention porte également sur un matériau actif cathodique destiné à une batterie rechargeable aux ions de lithium et comprenant l'oxyde composite lithium-manganèse du type spinelle qui présente de meilleures caractéristiques de charge-décharge obtenues grâce au procédé précité. L'oxyde composite ainsi obtenu est un nouvel oxyde dont les caractéristiques de cycle sont améliorées, notamment les caractéristiques de cycle de charge-décharge dans un environnement à haute température (supérieure à 50·), et est par conséquent très utile d'un point de vue industriel.

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