| abstract |
The present invention relates to a high-capacity positive electrode active material, and more particularly, to a high-capacity positive electrode active material for a lithium secondary battery, wherein the high-capacity positive electrode active material comprises a composite oxide having the following chemical formula 1: [Chemical formula 1] Li x Ni y Fe z Mn w O 2 (where 1≤x≤1.8, 0<y≤0.13, 0<z≤0.13 and 0.6≤w≤1.) |