POSITIVE ELECTRODE ACTIVE MATERIAL, PREPARATION METHOD THEREFOR, SECONDARY BATTERY, AND ELECTRIC DEVICE

WIPO Patent Application WO/2024/065647

A1

The present application relates to a positive electrode active material, which comprises: a first positive electrode active material containing a matrix of formula (I), the matrix being doped with an element M1: LiA1[NiX1CoY1MnZ1]O2 (I); and a second positive electrode active material containing a matrix of formula (II), the matrix being doped with an element M2: LiA2[NiX2CoY2MnZ2]O2 (II), the average particle size Dv50 of the first positive electrode active material being greater than the average particle size Dv50 of the second positive electrode active material, wherein 0