Positive electrode active material precursor for secondary battery, positive electrode active material, preparation methods thereof, and lithium secondary battery including the positive electrode active material

A positive electrode active material precursor for a secondary battery, the positive electrode active material precursor being in a form of a secondary particle in which a plurality of primary particles are aggregated,

• wherein major axes of the primary particles are arranged in a direction from a center of the secondary particle toward a surface thereof,
• wherein the primary particle comprises crystallines in which a (001) plane is arranged in a direction having an angle of 20° to 160° with respect to a major axis direction of the primary particle,
• wherein the positive electrode active material precursor is a hydroxide containing nickel (Ni), cobalt (Co), manganese (Mn), and aluminum (Al).