POROUS MEMBRANE, BATTERY SEPARATOR OBTAINED USING SAME, AND METHOD OF PRODUCING SAME

摘要

Considering that the battery separator of embodiments of the present invention will have thinner materials and lower costs, provided are a polyolefin porous membrane with exceptionally high peel strength between the polyolefin porous membrane and a modified porous layer, suitable for high-speed processing during slit processing and the battery assembly process, and suitable for laminating on a modified porous layer, and a battery separator obtained by laminating a modified porous layer on the polyolefin porous membrane. A polyolefin porous membrane comprising protrusions of polyolefin having a size (W) within a range of 5≦μm≦W≦50 μm and a height (H) within a range of 0.5 μm≦H and irregularly disposed on both sides of the polyolefin porous membrane in a density not less than 3/cm2 and not more than 200/cm2 per side, and the polyolefin porous membrane having a thickness of not more than 25 μm.

主权项

1. A polyolefin porous membrane comprising protrusions of polyolefin, wherein the protrusions have a size (W) within a range of 5 μm≦W≦50 μm and a height (H) within a range of 0.5 μm≦H, wherein the protrusions are irregularly disposed on opposing sides of the polyolefin porous membrane with a density greater than or equal to 3/cm2 per side and less than or equal to 200/cm2 per side, and wherein a thickness of the polyolefin porous membrane is less than or equal to 25 μm.