Positive electrode active material for lithium secondary battery and lithium secondary battery comprising same

An embodiment of the present invention provides a positive electrode active material for a lithium secondary battery. The positive electrode active material for a lithium secondary battery includes a plurality of composite particles including lithium metal phosphorus oxide particles and a carbon coating layer formed on at least a portion of a surface of the lithium metal phosphorus oxide particles, the standard deviation of the thickness value of the carbon coating layer measured by X-ray photoelectron spectroscopy (XPS) for each of five different composite particles among the plurality of composite particles is 15 nm or less. By uniformly forming the carbon coating layer, the conductivity of the positive electrode active material can be improved, and the power characteristics of the lithium secondary battery can be improved. 本发明的实施方案提供一种锂二次电池用正极活性物质。锂二次电池用正极活性物质包含多个复合颗粒，所述复合颗粒包含锂金属磷氧化物颗粒以及形成在锂金属磷氧化物颗粒的表面的至少一部分上的碳涂层，其中，通过X射线光电子能谱法(XPS)对多个复合颗粒中的5个彼此不同的复合颗粒分别测量的碳涂层的厚度值的标准偏差为15nm以下。通过均匀地形成碳涂层，可以提高正极活性物质的电导率，并且可以