Lithium manganate particles for non-aqueous electrolyte...

H - Electricity – 01 – M

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H01M 4/50 (2010.01)

Patent

CA 2738291

The present invention provides lithium manganate which has a high output and is excellent in high-temperature stability. The present invention relates to lithium manganate particles which are produced by mixing a lithium compound, a manganese compound, a Y compound and an A compound with each other and then calcining the resulting mixture, and have a composition represented by the following chemical formula 1 and an average secondary particle diameter (D 50) of 1 to 15 µm, (Chemical Formula) Li 1+x Mn 2-x-y Y y O4 + zA in which Y is at least one element selected from the group consisting of Al and Mg; A is a sintering aid element having a melting point of not higher than 850°C; x and y satisfy 0.03 <= x <=0.15 and 0<= y<= 0.20, respectively; z is in the range of 0 to 2.5 mol% based on Mn, wherein the lithium manganate particles have a sulfur content of not more than 100 ppm.

La présente invention concerne du manganate de lithium présentant une énergie de sortie élevée et une excellente stabilité à haute température. Linvention concerne en particulier une poudre de manganate de lithium représentée par la formule chimique 1, la poudre étant caractérisée en ce quelle est obtenue par le mélange et la cuisson dun composé de lithium, dun composé de manganèse, dun composé Y et dun composé A, et en ce quelle présente un diamètre de particule secondaire moyen (D50) de 1 à 15 µm. formule chimique 1 : Li1+xMn2-x-yYyO4 + zA (Dans la formule, Y représente Al et/ou Mg ; A représente un élément daide au frittage ayant un point de fusion inférieur ou égal à 850 °C ; et 0,03 = x = 0,15, 0 = y = 0,20, et z représente 0 à 2,5 % mol. de Mn.) La poudre de manganate de lithium est également caractérisée en ce quelle présente une teneur en soufre inférieure ou égale à 100 ppm.

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