METHOD FOR PREPARING A POSITIVE ELECTRODE ACTIVE MATERIAL PRECURSOR FOR A LITHIUM SECONDARY BATTERY HAVING A CONCENTRATION-GRADIENT LAYER AND FOR PREPARING A POSITIVE ACTIVE MATERIAL USING A BATCH REACTOR, AND POSITIVE ELECTRODE ACTIVE MATERIAL PRECURSOR FOR A LITHIUM SECONDARY BATTERY AND POSITIVE ACTIVE MATERIAL PREPARED BY THE METHOD

摘要

The present invention relates to a method for preparing a positive electrode active material precursor for a lithium secondary battery having a concentration-gradient layer and for preparing a positive active material using a batch reactor, and to a positive electrode active material precursor for a lithium secondary battery and positive active material prepared by the method. The method for preparing a positive electrode active material precursor for a lithium secondary battery having a concentration-gradient layer and for preparing a positive electrode active material using a batch reactor involves supplying a predetermined amount of chelating agent to the batch reactor, and simultaneously supplying a transition metal while continuously adjusting the concentration of the transition metal such that the concentration-gradient layer can be formed from a core to a shell of the positive electrode active material in a more economically advantageous and stable manner, and at the same time a positive electrode active material having an elongated lifespan and improved thermal stability can be provided.