CATHODE ACTIVE MATERIAL AND METHOD FOR PREPARING SAME, CATHODE PLATE, BATTERY, AND ELECTRIC DEVICE

Provided are a cathode active material and a preparation method thereof. The cathode active material is secondary particles. An equivalent number Rof (003) crystallographic planes of the cathode active material and an equivalent number Rof (104) crystallographic planes of the cathode active material satisfy that R/Rranges from 1.4 to 1.8, R=A/B, and R=A/B, where represents an average thickness of crystallites in the cathode active material in a direction perpendicular to the (003) crystallographic plane, in nm, Brepresents an interplanar spacing of the (003) crystallographic planes in the crystallites of the cathode active material, in nm, Arepresents an average thickness of the crystallites in the cathode active material in a direction perpendicular to the (104) crystallographic plane, in nm, and Brepresents an interplanar spacing of the (104) crystallographic planes in the crystallites of the cathode active material, in nm.