METHOD FOR MANUFACTURING ELECTRODE-SEPARATION FILM COMPLEX, ELECTRODE-SEPARATION FILM COMPLEX MANUFACTURED BY MANUFACTURING METHOD THEREFOR AND LITHIUM SECONDARY BATTERY COMPRISING SAME

摘要

The present invention relates to a method for manufacturing an electrode-separation film complex, the electrode-separation film complex manufactured by the manufacturing method therefor and a lithium secondary battery comprising the same, the method comprising the steps of: (S1) forming an electrode by coating at least one surface of an electrode current collector with electrode active material slurry and then drying the same; (S2) forming a separation film coating layer by coating at least one surface of the electrode with a high-molecular solution comprising high-molecular particles; and (S3) forming a porous separation film by drying the separation film coating layer. According to the present invention, the uniformity and flexibility of pores can be effectively controlled by coating the electrode with the high-molecular particles to form the porous separation film, process costs and time can be reduced by directly coating the electrode with the high-molecular solution to manufacture the porous separation film instead of separately manufacturing the separation film, and furthermore, when a functional group capable of capturing manganese is attached to the surfaces of the high-molecular particles forming the separation film, the deterioration of battery performance can be prevented through removal of manganese ions which may be poisoned on a cathode during an operation of a battery.