PRECURSOR FOR CATHODE ACTIVE MATERIALS FOR LITHIUMSECONDARY BATTERY, CATHODE ACTIVE MATERIALS AND LITHIUMSECONDARY BATTERY USING THE SAME, AND PREPARATION METHOD THEREOF

摘要

PURPOSE: A manufacturing method of a positive electrode active material is provided to have a uniform particle size and improve electrochemical properties by mixing a lithium salt and a precursor which has a controlled surface. CONSTITUTION: A manufacturing method of a positive electrode active material for a lithium secondary battery comprises following steps: a step(S1) of manufacturing a metal aqueous solution by mixing three kinds of material selected from nickel, cobalt, iron, manganese and aluminum; a step(S2) of obtaining a precipitate by putting the mixture into a continuous reactor and stirring the mixture after mixing sodium carbonate as a precipitator and an ammonia solution as a co-precipitator in the metal aqueous solution; a step of manufacturing a precursor by filtering, washing, and drying the precipitate; and a step(S3) of mixing the precursor and a lithium salt. [Reference numerals] (AA) Start; (BB) End; (S1) Manufacture a metal aqueous solution; (S2) Manufacture a complex metal oxide as a precursor by mixing a precipitator and co-precipitator with the metal aqueous solution; (S3) Manufacture positive electrode active material by mixing the precursor with lithium salt