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 03-phase layered metal oxide having the following molecular formula: NaaMbNicFedMneO2±δ (Formula I), in which M is a metal cation different from Ni, Fe and Mn; 0.67 < a < 1.1; 0 < b < 0.25, optionally 0.05 < b < 0.15; 0 < c < 0.3, optionally 0.05 < c < 0.25; 0 < b+c < 0.55, 0.45 < d+e