SEPARATOR AND METHOD OF MANUFACTURING THE SAME AND LITHIUM SECONDARY BATTERY INCLUDING THE SAME

摘要

The present invention relates to a separator, a manufacturing method thereof and a lithium secondary battery including separator comprising a porous substrate and a coating layer, which is positioned at one side of the porous substrate, comprising an inorganic compound and a binder polymer wherein the coating layer includes a first part close to the porous substrate and a second part facing the first part and the content of the binder polymer existing at the first part of the coating layer is higher than the content of the binder polymer existing at the second part of the coating layer. [Reference numerals] (AA) Surface part;(BB) Inside