Process for producing lithium manganate particles and...

C - Chemistry – Metallurgy – 01 – G

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C01G 45/12 (2006.01) H01M 4/50 (2010.01)

Patent

CA 2736985

A method for producing a lithium manganate particle powder having high output and excellent high-temperature stability. Specifically disclosed is a method for producing a lithium manganate particle powder represented by the following chemical formula: Li1+x Mn2-x- Y1y O4 + B (wherein Y1 represents at least one element selected from Ni, Co, Mg, Fe, Al, Cr or Ti, and x and y satisfy 0.03 <= x <= 0.15 and 0 <= y <= 0.20), wherein the lithium manganate particle powder is obtained by mixing a lithium compound, a manganese compound and a boron compound, and then firing the mixture within the temperature range of from 800°C to 1050°C. The method is characterized in that the average particle diameter (D50) of the boron compound is not more than 15 times the average particle diameter (D50) of the manganese compound.

L'invention porte sur un procédé de fabrication d'une poudre de particules de manganate de lithium ayant un rendement de production élevé et une excellente stabilité à haute température. De façon spécifique, l'invention porte sur un procédé pour la fabrication d'une poudre de particules de manganate de lithium représentée par la formule chimique suivante : Li1+xMn2x-yY1yO4 + B (dans laquelle Y1 représente au moins un élément choisi parmi Ni, Co, Mg, Fe, Al, Cr ou Ti et x et y satisfont aux relations 0,03 = x = 0,15 et 0 = y = 0,20), la poudre de particules de manganate de lithium étant obtenue par mélange d'un composé de lithium, d'un composé du manganèse et d'un composé du bore, puis par cuisson du mélange sur une plage de températures de 800°C à 1 050°C. Le procédé est caractérisé en ce que le diamètre moyen des particules (D50) du composé du bore n'est pas supérieur à 15 fois le diamètre moyen des particules (D50) du composé du manganèse.

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