| 摘要 |
Provided is a separator for a secondary battery, which maintains air permeability at a certain level, and thus promotes the migration of ions taking part in a cell chemical reaction of a secondary battery. The separator(100) for a secondary battery comprises: a substrate film(110); and a nano-sized fiber(120) attached onto at least one surface of the substrate film(110). The nano-sized fiber(120) is attached in an amount of 0.1-100g/m^2 per unit area of the substrate film(110). The substrate film(110) is composed of any one selected from the group consisting of polyethylene, polypropylene, and a copolymer of polyethylene and polypropylene. The nano-sized fiber(120) is composed of an adhesive polymer material. |
