Lithium-nickel-manganese-based transition metal oxide particles, their production and their use as electrode material

摘要

Process for the production of transition metal oxide particles of the general formula (1): LiMn1,5 + yNi0,5-y-zMzO4 (1), where M comprises one or more elements from Co, Mg, Fe and Zn, y has a value from 0 to less 0.5, z is a value from 0 to 0.1, and (y + z) is a value less than 0.5, the method comprising the steps of: (a) reacting an aqueous solution of manganese salts, nickel salts and optionally of one or more further salts of the elements Co, Mg, Fe and Zn with an aqueous solution of an alkali metal hydroxide and NH3, in order to precipitate a lithium-free transition metal precursor from the reaction mixture, the concentration of NH4 + ions in the reaction mixture after a chemical equilibrium has been established 0.05 mol / l or more, (b) isolating and optionally drying the precipitated lithium-free transition metal precursor from the reaction mixture, (c) reacting the lithium-free transition metal precursor with an aqueous solution of a thermally decomposable lithium compound to obtain a lithium-containing transition metal precursor, and (d) calcining the lithium-containing transition metal precursor at a temperature of 300 ° C-800 ° C.