COMPOSITE METAL OXIDE MATERIAL AND PREPARATION METHOD THEREOF, POSITIVE ELECTRODE PLATE, SECONDARY BATTERY, BATTERY MODULE, BATTERY PACK AND ELECTRICAL DEVICE

The present application provides a composite metal oxide material and a preparation method thereof, a positive electrode plate, a secondary battery, a battery module, a battery pack and an electrical device. The composite metal oxide material includes a central core and a coating layer on the surface of the central core, in which the central core material has a chemical formula of LiFeMO, 0.6≤x