Cathode active material for lithium secondary battery preparing method thereof cathode for lithium secondary battery including the same and lithium secondary battery comprising cathode including the same

복수의 일차입자를 포함하는 니켈계 리튬금속 산화물 대결정 이차입자이며, 상기 대결정 이차입자는 내부에 기공을 갖는 중공형 구조이며, 일차입자의 크기는 1 내지 4um이고, 대결정 이차입자의 크기는 10 내지 18um이고, 상기 니켈계 리튬금속 산화물 대결정 이차입자의 표면상에 배치된 코발트 화합물 함유 코팅층을 포함하며, 상기 니켈계 리튬금속 산화물 대결정 이차입자에 몰리브덴이 도핑된, 리튬이차전지용 양극활물질, 그 제조방법, 및 이를 포함하는 양극을 함유한 리튬이차전지가 제시된다. Provided are a positive electrode active material for a lithium secondary battery, a method of preparing the positive electrode active material, and a lithium secondary battery including a positive electrode that includes the positive electrode active material, wherein the positive electrode active material includes large crystal secondary particles of a nickel-based lithium metal oxide which include a plurality of primary particles, wherein the large crystal secondary particles have a hollow structure having pores therein, the primary particles have a size of about 1 µm to about 4 µm, the large crystal secondary particles have a size of about 10 µm to about 18 µm, the positive electrode active material comprises a coating layer containing a cobalt compound which is on surfaces of the large crystal secondary particles of the nickel-based lithium metal oxide, and the large crystal secondary particles of the nickel-based lithium metal oxide are doped with molybdenum.