Composite positive electrode active material, method for preparing same, and lithium secondary battery

Disclosed are: a composite positive electrode active material for a lithium secondary battery including a lithium cobalt-based oxide; a preparation method thereof; and a lithium secondary battery including a positive electrode including a composite positive electrode active material, in which in the composite positive electrode active material for a lithium secondary battery, a particle coating portion is arranged in the form of an island on one surface of a lithium cobalt-based oxide, the particle coating portion includes a first coating layer containing a lithium titanium-based oxide, and the surface coating portion is disposed in an inner region of the other surface of the lithium cobalt-based oxide. 公开了包括锂钴类氧化物的用于锂二次电池的复合正极活性物质；其制备方法；和包括包括复合正极活性物质的正电极的锂二次电池，其中在用于锂二次电池的复合正极活性物质中，颗粒涂覆部分以岛的形式布置在锂钴类氧化物的一个表面上，颗粒涂覆部分包括含有锂钛类氧化物的第一涂层，并且表面涂覆部分布置在锂钴类氧化物的另一表面的内部区中。