POSITIVE ELECTRODE ACTIVE MATERIAL, SODIUM ION SECONDARY BATTERY, AND MANUFACTURING METHOD FOR THE POSITIVE ELECTRODE ACTIVE MATERIAL

Japanese Patent JP2023181098

A

To provide a positive electrode active material that makes it possible to improve charge-discharge cycle characteristics by suppressing changes in the crystal structure during charging and discharging and makes it possible to ensure sufficient output characteristics, a sodium ion secondary battery using the same, and a manufacturing method for the positive electrode active material even when Mn-Ni metal oxide is used as the positive electrode active material for the sodium ion secondary battery.SOLUTION: The positive electrode active material for a sodium ion battery is a metal oxide having a P2-type crystal structure represented by Nap(MnxNiyAz)O2 (where, 1/2