METHOD FOR ANALYZING CONTENT AND DISTRIBUTION OF BORON INTRODUCED INTO POSITIVE ELECTRODE ACTIVE MATERIAL

The present invention provides a method, for analyzing the content of boron introduced into a positive electrode active material, comprising the steps of: (S1) preparing a positive electrode active material sample into which boron is introduced; (S2) separating a first liquid layer and a first precipitate by dissolving the positive electrode active material sample in water, and then measuring the boron concentration by analyzing a solution, which is obtained by acid treating the first liquid layer, by means of inductively coupled plasma optical emission spectroscopy (ICP-OES); (S3) separating a second liquid layer and a second precipitate by dissolving the first precipitate in water, and then measuring the boron concentration by analyzing a solution, which is obtained by acid treating the second liquid layer, by means of ICP-OES; and (S4) measuring the boron concentration by analyzing a solution, which is obtained by adding acid and hydrogen peroxide to the second precipitate, by means of ICP-OES. According to the present invention, by sequentially extracting and analyzing boron, which is introduced to enhance the performance of a positive electrode active material for a lithium secondary battery, by means of solubility differentials of water and acid in accordance with distribution location, an optimum boron content for enhancing the performance of the positive electrode active material can be obtained by means of the distribution aspects of the boron in the positive electrode active material.