BATTERY SEPARATOR COMPRISING MULTI-LAYERED MICROPOROUS FILM, AND MANUFACTURING METHOD THEREOF BY LAMINATING TOGETHER PRECURSORS

摘要

PURPOSE: Provided are a battery separator having improved peel strength, and a manufacturing method thereof. CONSTITUTION: The battery separator comprises a multi-layered microporous film, each layers of which is adhered together by heat and pressure, has a peel strength of greater than 40 g/in(1.6 g/mm) and a thickness of 25 microns or less. A method for manufacturing a battery separator comprises the steps of: extruding and winding up a first precursor film; extruding and winding up a second precursor film; unwinding the first and second precursor films; stacking the first and second precursor films to form a single stacked precursor; laminating the single stacked precursor film; winding up the laminated single stacked precursor film; stacking a plurality of laminated single stacked precursor films; and forming a plurality of micropores on the stacked plurality of laminated single stacked precursor films.