The present invention provides a metal composite for a cathode active material, a cathode active material using same, a secondary battery using same, and a manufacturing method therefor and, through the present invention, problems of a conventional technology, such as pH control instability, precipitation phase non-formation, complicated processing, lack of reproducibility and delay of grain growth, can be resolved and a metal composite containing a porous layer in particles can be manufactured. Since the metal composite containing a porous layer in particles is provided, the prevention of battery performance degradation, which leads to electrode deterioration caused by the formation of cracks in an active material, is expected.