POSITIVE ELECTRODE ACTIVE MATERIAL, ALL-SOLID-STATE BATTERY COMPRISING SAME, AND METHOD FOR MANUFACTURING SAME

The present invention relates to a positive electrode active material, an all-solid-state battery comprising same, and a method for manufacturing same. The positive electrode active material for an all-solid-state battery according to the present invention is a lithium metal oxide in the form of single particles having a particle strength of 300 to 1500 MPa and an average particle diameter of at most 10 µm. Since the positive electrode active material according to the present invention is in the form of single particles having a high particle strength of at least 300 MPa and a small average particle diameter of at most 10 µm as indicated above, cracks do not form or are delayed even when pressure is applied during the manufacture of the positive electrode or structural stress is applied over the lifespan of the battery.