| abstract |
The present application provides a positive electrode active material, a positive electrode plate and an electrochemical energy storage device. The positive electrode active material is Li x Ni y Co z M k Me p O r Am or Li x Ni y Co z M k Me p O r Am with a coating layer on the surface, the positive electrode active material is secondary particles, and the positive electrode is The particle size D n 10 of the active material satisfies 0.5 μm≤D n 10≤3 μm, and the theoretical specific surface area BET 1 and the real specific surface area BET 2 of the positive electrode active material satisfy 0.8≤(BET 2 -BET 1 )/BET 1 ≤5.5. By reasonably controlling the particle morphology of the positive electrode active material and the number of micropowders in the positive electrode active material, the present application effectively reduces the side reaction between the positive electrode active material and the electrolyte, reduces the gas production of the electrochemical energy storage device, and can improve the electrochemical performance. The storage performance of the energy storage device does not deteriorate the energy density, cycle performance and rate performance of the electrochemical energy storage device. |