CATHODE HAVING INCREASED HARDNESS FOR IMPROVED SAFETY, MANUFACTURING METHOD THEREFOR, AND SECONDARY BATTERY COMPRISING SAME

摘要

The present disclosure provides a positive electrode for a secondary battery in which a positive electrode mixture including a positive electrode active material is formed on at least one surface of a current collector,wherein the positive electrode includes a lithium by-product so as to satisfy the following Equation 1 based on the total weight of the positive electrode mixture, andwherein the positive electrode has a harness at which cracks occur in a measuring rod of 2 pi (Ø) or more, during a flexibility test a harness at which cracks occur in a measuring rod of 2 pi (Ø) or more, during a flexibility test in which the electrode is bent in half to contact the measuring rod for each pi, and then both ends of the positive electrode are lifted: in the Equation 1,A is the molar content of Ni when the total mole of transition metal contained in the positive electrode active material is 1, and B is the content of lithium by-product,when the A is 0.5 or less, the minimum value of B is 6000 ppm.