CPC H01M 10/0525 (2013.01) [H01M 50/417 (2021.01); H01M 50/423 (2021.01); H01M 50/443 (2021.01); H01M 50/446 (2021.01); H01M 50/451 (2021.01); H01M 50/457 (2021.01); H01M 50/463 (2021.01); H01M 50/489 (2021.01); H01M 50/491 (2021.01)] | 8 Claims |
1. A porous film comprising:
a porous substrate; and
a porous layer laminated on at least one surface of the porous substrate, the porous layer containing an organic resin different from a resin constituting the porous substrate,
wherein in an interface between the porous substrate and the porous layer, a height of a projection of the porous layer is 200 nm or more and a distance between projections is 1 μm to 5 μm, and
the porous layer has a porosity of 40% to 80%, and an adhesive ratio between the porous substrate and the organic resin constituting the porous layer is 50% to 85%.
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