US 11,742,514 B2
Porous film, separator for secondary batteries, and secondary battery
Kei Ikoma, Nasushiobara (JP); Nobuyasu Kai, Otsu (JP); and Akimitsu Tsukuda, Otsu (JP)
Assigned to Toray Industries, Inc., Tokyo (JP)
Appl. No. 16/650,548
Filed by Toray Industries, Inc., Tokyo (JP)
PCT Filed Sep. 26, 2018, PCT No. PCT/JP2018/035816
§ 371(c)(1), (2) Date Mar. 25, 2020,
PCT Pub. No. WO2019/065787, PCT Pub. Date Apr. 4, 2019.
Claims priority of application No. 2017-189896 (JP), filed on Sep. 29, 2017.
Prior Publication US 2020/0321586 A1, Oct. 8, 2020
Int. Cl. H01M 50/449 (2021.01); H01M 10/0525 (2010.01); H01M 50/446 (2021.01); H01M 50/463 (2021.01); H01M 50/417 (2021.01); H01M 50/423 (2021.01); H01M 50/489 (2021.01); H01M 50/443 (2021.01); H01M 50/457 (2021.01); H01M 50/451 (2021.01); H01M 50/491 (2021.01)
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
OG exemplary drawing
 
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%.