POSITIVE ELECTRODE ACTIVE MATERIAL AND PREPARATION METHOD THEREFOR, SODIUM ION BATTERY, AND APPARATUS COMPRISING SODIUM ION BATTERY

The present application discloses a positive electrode active material satisfying the chemical formula LNaMCuFeMnOXand a preparation method therefor, a sodium ion battery and an apparatus including such battery, wherein L is a doping element at alkali metal site, M is a doping element at transition metal site, and X is a doping element at oxygen site, 0≤x