Nickel-based active material for lithium secondary battery, method of preparing the same, and lithium secondary battery including positive electrode including the nickel-based active material

A nickel-based active material for a lithium secondary battery, the nickel-based active material comprising:

• at least one secondary particle comprising at least two primary particle structures,
• wherein the at least two primary particle structures each comprise a porous inner portion and an outer portion comprising a radially arranged structure,
• wherein the at least one secondary particle comprises at least two radial centers,
• wherein the at least two primary particle structures each comprise an agglomeration of at least two primary particles, and
• wherein respective ones of the at least two primary particles of each primary particle structure are radially arranged around a respective one of the at least two radial centers.