| abstract |
The present invention relates to a surface-coated positive electrode active material particle and a secondary battery comprising the same, and more particularly to a positive electrode active material particle and a coating layer coated on the surface of the positive electrode active material particle, wherein the coating layer contains pyrrole, The present invention also provides a surface-coated cathode active material particle comprising a polyimide including at least one structure selected from the group consisting of a sol. Since the surface-coated cathode active material particles according to the present invention include a coating layer containing polyimide and metal ions, it is possible to prevent side reactions between the cathode active material and the electrolyte by preventing direct contact between the cathode active material particles and the electrolytic solution , The lithium ion mobility and the electron conductivity may all be excellent. This can improve the life characteristics and cycle characteristics of the secondary battery under high temperature and high voltage conditions. |