| abstract |
The present invention relates to a surface-coated positive electrode active material, a preparation method thereof, and a lithium secondary battery comprising the same. More particularly, the present invention relates to a positive electrode active material surface-coated with a nanofilm comprising polyimide (PI) and conductive nanoparticles, a preparation method thereof, and a lithium secondary battery comprising the same. The positive electrode active material whose surface is coated with the nano film can prevent direct contact between the positive electrode active material and the electrolyte, thereby suppressing side reactions between the positive electrode active material and the electrolyte, and can significantly improve the use of The positive electrode active material of the positive electrode has life characteristics of a lithium secondary battery, and in particular can improve life characteristics and conductivity under high temperature and high voltage conditions. |