A lithium secondary battery includes a positive electrode including a lithium manganese-based first positive electrode active material having a spinel structure and a lithium nickel-manganese-cobalt-based second positive active material and a negative elec...

Provided is a lithium ion positive electrode active material for a secondary battery that can realize a high operating voltage and a high capacity while suppressing capacity drop with cycles by using a low-cost material. A positive electrode active materia...