POSITIVE ELECTRODE ACTIVE MATERIAL, POSITIVE ELECTRODE PLATE, SECONDARY BATTERY, POWER CONSUMING APPARATUS, AND PREPARATION METHOD

This application provides a positive electrode active material, a positive electrode plate, a secondary battery, a power consuming apparatus, and a preparation method. The positive electrode active material includes polycrystalline particles designated as the first active particles and monocrystalline or quasi-monocrystalline particles designated as second active particles. (D90−D10)/D50 of the first active particles and the second active particles are respectively designated as X1 and X2, where X1/X2 satisfies 0.2≤X1/X2≤0.7.