Method for preparing lithium transition metalates

Details Method for preparing lithium transition metalates Method for preparing lithium transition metalates

C - Chemistry, Metallurgy

01

G

C01G 53/04 (2006.01) C01G 45/02 (2006.01) C01G 49/04 (2006.01) C01G 51/04 (2006.01)

Patent

CA 2511380

The invention relates to a method for producing lithium transition metallates of the general formula (I): Li x (M1 y M2 1-y) n O nx, where M1 represents nickel, cobalt or manganese; M2 represents chromium, cobalt, iron, manganese, molybdenum and/or aluminum and is not equal to M1; n is equal to 2 if M1 = Mn, and 1 in all other cases; x is a number between 0.9 and 1.2; y is a number between 0.5 and 1.0; and z is a number between 1.9 and 2.1. According to the method, an intimate solid mixture is produced of oxygen-containing compounds of the transition metals and oxygen-containing lithium compound and this mixture calcinated in a reactor, the calcination takes place at least partly at an absolute pressure of less than 0.5 bar. This method solves the problem of insufficient removal of gases produced during calcination and provides a process requiring shorter reaction times and lower temperatures. A process for preparing a preliminary mixture for producing the lithium transition metallates comprises impregnating sparingly soluble transition metal compounds with highly concentrated lithium salt solutions and then drying.

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