| 摘要 |
PURPOSE: A separator for an alkali secondary battery and its preparation method are provided, to prevent an electrolyte solution from being dried after charge/discharge for a long time for improving the lifetime of a battery and to prevent a free electrolyte solution from being generated for improving the capacity of a battery. CONSTITUTION: The separator comprises a polyolefin-based or nylon-based nonwoven whose surface has spacers having a diameter of 50-100 micrometers. The method comprises the steps of placing a glass bead(spacer) having a diameter of 50-100 micrometers on the surface of a polyolefin-based or nylon-based nonwoven, and mechanically compressing the glass bead. Preferably the compression pressure is 5-7 kgf/cm¬2. |
