POSITIVE ELECTRODE ACTIVE MATERIAL, SODIUM ION SECONDARY BATTERY COMPRISING SAME AND POWER CONSUMING DEVICE

A positive electrode active material is granular and comprises a compound represented by formula 1: (NaxAy)a□bM1[M2(CN)]δ, wherein A is selected from at least one of alkali metal elements and has an ionic radius greater than that of sodium, M1 and M2 are each independently selected from at least one of transition metal elements, 0