Apparatus and method for manufacturing positive electrode active material precursor

A method for manufacturing a positive electrode active material precursor, comprising:

• feeding an initial solution into a reaction vessel;
• feeding a reaction solution into the reaction vessel in which the initial solution has been fed;
• and
• stirring the initial solution and the reaction solution with a stirring means to obtain a positive electrode active material precursor,
• wherein the stirring means comprises a shaft and two stages of impellers,
• the impellers are inclined at an angle of 5° to 90° with respect to a horizontal direction,
• and the initial solution is fed such that the two stages of impellers are fully submerged.