POSITIVE ELECTRODE ACTIVE MATERIAL FOR SODIUM ION BATTERY, SODIUM ION BATTERY MADE FROM SAME, BATTERY MODULE, BATTERY PACK AND APPARATUS

The present disclosure relates to a positive electrode active material for a sodium ion battery, a sodium ion battery made from the same, a battery module, a battery pack and an apparatus. Specifically, the positive electrode active material for a sodium ion battery mainly includes an O3-phase layered metal oxide having the following molecular formula: NaMNiFeMnO (Formula I), in which M is a metal cation different from Ni, Fe and Mn; 0.67