HEAT-RESISTANT AND HIGH-TENACITY ULTRAFINE FIBROUS SEPARATION LAYER, METHOD FOR MANUFACTURING SAME, AND SECONDARY CELL USING SAME

摘要

The present invention relates to a heat-resistant ultrafine fibrous separation layer and to a method for manufacturing same, which enable the mass production of a heat-resistant and high-tenacity ultrafine fibrous separation layer by using an air-electrospinning (AES) method, and to a secondary cell using same. A method for manufacturing a heat-resistant and high-tenacity ultrafine fibrous porous separation layer according to the present invention comprises the steps of: air-electrospinning a mixed solution of 50 to 70 wt % of a heat-resistant polymer material and 30 to 50 wt % of a swelling polymer material, and forming a porous web of a heat-resistant ultrafine fiber consolidated with a heat-resistant polymer and swelling polymer ultrafine fiber; performing drying to control the moisture and solvent remaining on the surface of the porous web; and performing thermal compression on the dried porous web at a temperature of between 170°C and 210°C so as to obtain a separation layer.