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

Method for producing lithium-nickel-manganese based transition metal oxide particles having general formula (1):

• LiMn1.5+yNi0.5−y−zMzO4 (1),
• wherein M comprises one or more elements from the group of Co, Mg, Fe and Zn,
• y is a value from 0 to less than 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 optional one or more further salts of the elements Co, Mg, Fe and Zn with an aqueous solution of an alkali metal hydroxide and NH3 to precipitate a lithium-free transition metal precursor from the reaction mixture,
• wherein the concentration of NH4+ ions in the reaction mixture after establishing a chemical equilibrium is 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.