	US 12,407,066 B2
	Separator for non-aqueous secondary battery and non-aqueous secondary battery
Megumi Sato, Osaka (JP); Rika Kuratani, Osaka (JP); Yu Nagao, Osaka (JP); Masato Okazaki, Osaka (JP); and Satoshi Nishikawa, Osaka (JP)
Assigned to TEIJIN LIMITED, Osaka (JP)
Appl. No. 17/439,610
Filed by TEIJIN LIMITED, Osaka (JP)
PCT Filed Mar. 23, 2020, PCT No. PCT/JP2020/012705 § 371(c)(1), (2) Date Sep. 15, 2021, PCT Pub. No. WO2020/189796, PCT Pub. Date Sep. 24, 2020.
Claims priority of application No. 2019-052384 (JP), filed on Mar. 20, 2019.
Prior Publication US 2022/0149483 A1, May 12, 2022
Int. Cl. H01M 50/417 (2021.01); H01M 10/0525 (2010.01); H01M 50/409 (2021.01); H01M 50/426 (2021.01); H01M 50/446 (2021.01); H01M 50/451 (2021.01); H01M 50/489 (2021.01); H01M 50/491 (2021.01)

CPC H01M 50/417 (2021.01) [H01M 50/409 (2021.01); H01M 50/426 (2021.01); H01M 50/446 (2021.01); H01M 50/451 (2021.01); H01M 10/0525 (2013.01); H01M 50/489 (2021.01); H01M 50/491 (2021.01)]

18 Claims

1. A separator for a non-aqueous secondary battery, the separator comprising:

a porous substrate; and

a heat-resistant porous layer that is provided on one side or on both sides of the porous substrate, and that contains a binder resin and barium sulfate particles,

wherein an average primary particle diameter of the barium sulfate particles contained in the heat-resistant porous layer is from 0.05 μm to less than 0.30 μm,

wherein a volume ratio of the barium sulfate particles in the heat-resistant porous layer is from 30% by volume to less than 50% by volume,

wherein the binder resin is a wholly aromatic polyamide, and

wherein an area shrinkage ratio of the separator for a non-aqueous secondary battery, when heat-treated at 135° C. for 1 hour, is 10% or less.