6. A method for preparing the precursor of a positive electrode active material for a secondary battery of Claim 1, the method comprising: preparing a metal-containing solution by mixing a nickel raw material, a cobalt raw material and a manganese raw material;
and and introducing an ammonium cation-containing complex forming agent and a basic compound to the metal-containing solution and co-precipitation reacting the result under a pH of 10.50 to 12.00 and a temperature of 50C to 70C, wherein the ammonium cation-containing complex forming agent is introduced at a rate of 0.5 times to 1.5 times with respect to an introduction rate of the metalcontaining solution.
pH
10.50 to 12.00
temperature
50C to 70C
C