CATHODE ACTIVE MATERIAL, PREPARATION METHOD THEREFOR, CATHODE PLATE, BATTERY, AND ELECTRIC DEVICE

The present disclosure relates to a cathode active material, a preparation method therefor, a cathode plate, a battery, and an electric device. The cathode active material is an iron-based sulfate cathode material for the sodium-ion battery. An X-ray diffraction pattern of the cathode active material has a first characteristic peak in a range from 34.9° to 35.3° and a second characteristic peak in a range from 35.3° to 35.5°. A peak intensity Iof the first characteristic peak and a peak intensity Iof the second characteristic peak satisfy: 1.1≤I/I≤1.5. When the cathode active material satisfies the above condition, it indicates that Fe in the cathode active material exists mainly in the form of Fe and that a mass percentage of Fe in the material is smaller than 1.5%.