Positive electrode active material for lithium secondary battery and method for preparing same

The present invention relates to a positive electrode active material, a method for preparing the same, and a positive electrode and a lithium secondary battery comprising the same, the positive electrode active material comprising: a lithium transition metal oxide having a spinel crystal structure; and a coating layer on a surface of the lithium transition metal oxide, wherein the coating layer includes an oxide having an orthorhombic structure and represented by Chemical Formula 1. 本发明涉及一种正极活性材料、制备该正极活性材料的方法、以及包含该正极活性材料的正极和锂二次电池，该正极活性材料包含：具有尖晶石晶体结构的锂过渡金属氧化物；以及位于该锂过渡金属氧化物表面上的涂层，其中所述涂层包含具有斜方晶结构并由化学式1表示的氧化物。