| 摘要 |
PROBLEM TO BE SOLVED: To provide a separator for a secondary battery capable of suppressing peeling of an inorganic layer from a porous base layer and maintaining heat resistance and durability.SOLUTION: The separator for the secondary battery includes a porous base layer having electric insulation and an inorganic layer laminated on the porous base layer, the inorganic layer containing a plurality of inorganic particles and a binder for binding inorganic particles together, and being adhered to the porous base layer by adhesiveness of the binder. In the separator, the organic base layer is characterized in that a density of the inorganic particle becomes higher as the position of the particle becomes closer to the porous base layer in a lamination direction with respect to the porous base layer. |
