POSITIVE ELECTRODE SHEET AND LITHIUM ION BATTERY INCLUDING THE SAME

The present invention provides a positive electrode sheet and a lithium ion battery including the same. The present invention is implemented by controlling a safe coating layer and a positive electrode active material layer coated on a surface of a positive electrode current collector, especially controlling the selection of a first positive electrode active material in the safe coating layer, mixing NCM material and LCO material, and making high-voltage small particles of lithium cobaltate as one of fillers for the safe coating layer, where the doped high-voltage lithium cobaltate can be provided for supporting the NCM material, that is, with the safe coating layer, the short-circuit failure between a negative electrode and an aluminum foil caused by burrs of the aluminum foil may be avoided, the mechanism may be improved and the safety performance may be increased, and at the same time, the problems of cycle capacitance attenuation and excessive increase of high-temperature internal resistance, caused by the breakage of the NCM material particles, may also be improved while guaranteeing the improvement of safety performance in the above process.