Highly crystalline lithium transition metal oxides

C - Chemistry – Metallurgy – 01 – G

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C01G 45/00 (2006.01) H01M 4/131 (2010.01) H01M 4/505 (2010.01) H01M 4/525 (2010.01) C01G 23/00 (2006.01) C01G 51/00 (2006.01) C01G 53/00 (2006.01)

Patent

CA 2735245

A powderous lithium transition metal oxide having a layered crystal structure Li1+a M1-a O2~b M'k S m with -0.03 < a < 0.06, b.congruent.= 0, 0 <= m <= 0.6, m being expressed in mol%, M being a transition metal compound, consisting of at least 95% of either one or more elements of the group Ni, Mn, Co and Ti; M' being present on the surface of the powderous oxide, and consisting of either one or more elements of the group Ca, Sr, Y, La, Ce and Zr, wherein: either k = 0 and M = Ni1-c-d Mn c CO d, with 0 < c < 1, and 0 < d < 1; or 0.015 < k < 0.15, k being expressed in wt% of said lithium transition metal oxide; characterized in that for said powderous oxide, the X-ray diffraction peak at 44.5 ~ 0.3 degree, having as index 104, measured with K alpha radiation, has a FWHM value of <= 0.1 degree. By optimizing the sintering temperature of the metal oxide the FWHM value can be minimized.

L'invention porte sur un oxyde de lithium et de métal de transition pulvérulent ayant une structure cristalline lamellaire Li1+aM1-aO2±b M'k Sm avec -0,03 < a < 0,06, b ? 0, 0 = m = 0,6, m étant exprimé en % en mole, M étant un composé métal de transition, constitué à hauteur d'au moins 95 % d'un ou plusieurs éléments quelconques du groupe Ni, Mn, Co et Ti; M' étant présent sur la surface de l'oxyde pulvérulent et étant constitué d'un ou plusieurs éléments quelconques du groupe Ca, Sr, Y, La, Ce et Zr, où : soit k = 0 et M = Ni1-c-dMncCOd, avec 0 < c < 1 et 0 < d < 1; soit 0,015 < k < 0,15, k étant exprimé en % en poids dudit oxyde de lithium et de métal de transition; caractérisé par le fait que pour ledit oxyde pulvérulent, le pic de diffraction des rayons X à 44,5 ± 0,3 degrés, ayant comme indice 104, mesuré avec un rayonnement K-alpha, a une valeur de FWHM = 0,1 degré. Par l'optimisation de la température de frittage de l'oxyde de métal la valeur de FWHM peut être minimisée.

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