POSITIVE ELECTRODE ACTIVE MATERIAL, ELECTRODE, BATTERY, AND METHOD FOR PRODUCING POSITIVE ELECTRODE ACTIVE MATERIAL

The present disclosure relates to a positive electrode active material. The positive electrode active material includes a crystal structure belonging to a space group Pnma and an X-ray diffraction pattern satisfying a relationship of "5.8 ≤ I()/I()", wherein "I()" represents an integrated intensity of a 200 diffraction peak and "I()" represents an integrated intensity of a 020 diffraction pattern.