NON-BASED POSITIVE LECTURE ACTIVE SUBSTANCES FOR LITHYUM SECONDARY ACTIVITIES, MANUFACTURING PROCEDURES AND LITHYUM SECONDARY ACTIVE SUBSTANCES

摘要

A nickel-based composite positive electrode active material for a lithium secondary battery is in the form of secondary particles each comprised of a plurality of primary particles, each primary particle of the plurality of primary particles having a core portion formed of a nickel-based lithium metal oxide having a layered phase and a surface portion positioned on the core portion, wherein the surface portion has a spinel phase and the layered phase. A method of preparing the nickel-based composite active material, and a lithium secondary battery containing a positive electrode including the nickel-based composite active material are also provided.