| abstract |
The present application relates to a positive electrode active material, a method for manufacturing the same, a positive electrode sheet, a lithium ion secondary battery 5 and its related battery module 4, a battery pack 1 and an apparatus. The positive electrode active material includes lithium nickel cobalt manganese oxide, the molar content of nickel in lithium nickel cobalt manganese oxide is 60% to 90% of the total molar content of nickel, cobalt and manganese, and lithium nickel cobalt manganese oxide is a space group has a layered crystal structure belonging to, the transition metal layer of lithium nickel cobalt manganese oxide contains a doping element, the relative deviation of the local mass concentration of the doping element in the particles of the positive electrode active material is 20% or less, and 78% of the positive electrode active material In the differential scanning calorimetry analysis spectrum in the delithiation state, the initial heat dissipation temperature of the main heat dissipation peak is 200° C. or higher, and the integral area of the main heat dissipation peak is 100 J/g or less. |