Process for preparing lithium transition metallates

Details Process for preparing lithium transition metallates Process for preparing lithium transition metallates

C - Chemistry, Metallurgy

01

G

C01G 53/04 (2006.01) C01G 45/02 (2006.01) C01G 49/02 (2006.01) C01G 51/04 (2006.01) C01G 53/00 (2006.01) H01M 4/48 (2006.01)

Patent

CA 2320155

The invention relates to a method for producing lithium-transition metal mixtures of general formula Li x(M1y M2 1-y)n O nz, wherein M1 represents nickel, cobalt or manganese, M2 represents chromium, cobalt, Iron, manganese, molybdenum or aluminium, and is different from M1, n is 2 if M1 represents manganese and is 1 otherwise, x is comprised between 0.9 and 1.2, y is comprised between 0.5 and 1.0 and z is comprised between 1.9 and 2.1. According to the inventive method, an intimate mixture composed of transition metal compounds containing oxygen and of a lithium compound containing oxygen is calcinated, said mixture being obtained by processing a solid powder transition metal compound with a solution of said lithium compound, and then drying. At least the M1 compound is used in powder form having a specific surface of at least 20 m2/g (BET) and calcination is earned out in a fluidised bed.

L'invention concerne un procédé de production de sels de mélanges lithium-métaux de transition de formule générale Lix(M<1>yM<2>l-y)nOnz, dans laquelle M<1> représente nickel, cobalt ou manganèse, M<2> représente chrome, cobalt, fer, manganèse, molybdène ou aluminium, et est différent de M<1>, n vaut 2 si M<1> représente manganèse, et sinon est égal à 1, x est compris entre 0,9 et 1,2, y est compris entre 0,5 et 1,0, et z est compris entre 1,9 et 2,1. Selon ce procédé, on calcine un mélange intime constitué de composés de métaux de transition renfermant de l'oxygène et d'un composé de lithium renfermant de l'oxygène, ledit mélange étant obtenu par traitement d'un composé de métal de transition solide pulvérulent avec une solution du composé de lithium, suivi d'un séchage. Au moins le composé M<1> est utilisé sous forme d'une poudre présentant une surface spécifique d'au moins 20 m<2>/g (BET), et la calcination est effectuée dans un lit fluidisé.

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