Method For Preparing Negative Electrode Active Material For Lithium Secondary Battery, And Negative Electrode Active Material For Lithium Secondary Battery Prepared Thereby

Abstract: The present invention relates to a method for preparing a negative electrode active material for a lithium secondary battery and a negative electrode active material prepared by the method, the method comprising: a first step of dispersing silicon-based particles in a solvent to form a silicon dispersion; a second step of adding iron salt and tannic acid to the silicon dispersion and stirring to form a reaction layer of iron salt and tannic acid on the surface of the silicon-based particles; a third step of heat treating the reaction layer of iron salt and tannic acid to form an amorphous carbon coating layer; and a fourth step of acid-treating the amorphous carbon coating layer to form a porous amorphous carbon coating layer.

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