Positive electrode active material precursor for lithium secondary battery, positive electrode active material manufactured by using thereof, and lithium secondary battery including the same

A positive electrode active material comprising:

• a plurality of primary particles, each of the plurality of primary particles comprising a plurality of metals;
• and
• a secondary particle comprising the plurality of primary particles,
• wherein each of the plurality of primary particles has an a-axis and a c-axis in a crystal structure,
• wherein the a-axis and the c-axis are defined by a diffraction pattern of a Fourier transform obtained from a TEM image of the plurality of primary particles,
• wherein the secondary particle comprises a center part and a surface part surrounding the center part, and
• the a-axis of at least a part of the plurality of primary particles extends in a direction toward the surface part.

A positive electrode active material comprising:

• an oxide of at least one of nickel, cobalt, manganese and aluminum and lithium;
• and
• a secondary particle comprising a plurality of primary particles,
• wherein each of the plurality of primary particles has an a-axis and a c-axis in a crystal structure,
• wherein the a-axis and the c-axis are defined by a diffraction pattern of a Fourier transform obtained from a TEM image of the plurality of primary particles,
• wherein the secondary particle comprises a seed region, an intermediate region, and a maintain region in a direction from a center part to a surface part,
• wherein a length of the primary particles of the maintain region in the direction from the center part to the surface part is longer than a length of the primary particles of the seed region, and
• wherein a content of a metal of the maintain region is smaller than a content of a metal of the seed region.