POSITIVE ELECTRODE ACTIVE MATERIAL FOR LITHIUM SECONDARY BATTERY, METHOD FOR PREPARING THE SAME, AND LITHIUM SECONDARY BATTERY COMPRISING THE SAME

摘要

The present invention relates to a positive electrode active material for a lithium secondary battery, a method for preparing the same, and a lithium secondary battery including the same. The positive electrode active material further includes: a core including a first lithium composite metal oxide; a shell positioned to surround the core particle and including a second lithium composite metal oxide; and a buffer layer positioned between the core and the shell. The buffer layer includes a pore and a three-dimensional network structure of a third lithium composite metal oxide connecting the core and the shell to each other. Accordingly, damage to the active material attributable to a rolling process can be minimized during electrode preparation, electrolyte reactivity can be maximized, and output and life characteristics of the lithium secondary battery can be improved because a particle forming the shell has a crystal structure oriented to facilitate lithium ion insertion and desorption.