Positive electrode for rechargeable lithium battery and rechargeable lithium battery including same

Disclosed are a positive electrode for a rechargeable lithium battery and a rechargeable lithium battery including the same, the positive electrode for the rechargeable lithium battery including a positive electrode current collector and a positive electrode active material layer on the positive electrode current collector, in which the positive electrode active material layer includes a positive electrode active material, the positive electrode active material includes a first positive electrode active material including about 75 wt% to about 100 wt% of a single particle form and including a lithium nickel-based composite oxide having a nickel content of 70 mol% or more with respect to a total metal other than lithium; and from about 0 wt% to about 25 wt% of a second positive electrode active material in the form of a secondary particle in which a plurality of primary particles are aggregated and including a lithium nickel-based composite oxide, and in an X-ray diffraction analysis of the positive electrode,