US 12,294,113 B2
Separator for non-aqueous secondary battery and non-aqueous secondary battery
Rika Kuratani, Osaka (JP); Megumi Sato, Osaka (JP); and Satoshi Nishikawa, Osaka (JP)
Assigned to TEIJIN LIMITED, Osaka (JP)
Appl. No. 16/767,310
Filed by Teijin Limited, Osaka (JP)
PCT Filed Nov. 29, 2018, PCT No. PCT/JP2018/044096
§ 371(c)(1), (2) Date May 27, 2020,
PCT Pub. No. WO2019/107521, PCT Pub. Date Jun. 6, 2019.
Claims priority of application No. 2017-231255 (JP), filed on Nov. 30, 2017.
Prior Publication US 2020/0411827 A1, Dec. 31, 2020
Int. Cl. H01M 50/46 (2021.01); H01M 50/417 (2021.01); H01M 50/426 (2021.01); H01M 50/443 (2021.01); H01M 50/451 (2021.01); H01M 50/457 (2021.01)
CPC H01M 50/461 (2021.01) [H01M 50/417 (2021.01); H01M 50/426 (2021.01); H01M 50/443 (2021.01); H01M 50/451 (2021.01); H01M 50/457 (2021.01)] 9 Claims
 
1. A separator for a non-aqueous secondary battery, the separator comprising:
a porous substrate; and
an adhesive porous layer that is provided on one side or both sides of the porous substrate and contains the following resin A and resin B2, wherein a total acid value of the resin A and the resin B2 is from 3.0 mg KOH/g to 20 mg KOH/g, and wherein a molecular weight distribution (Mw/Mn), which is a ratio of a weight-average molecular weight (Mw) to a number-average molecular weight (Mn), of an entirety of the resin A and the resin B2 is more than 2.0, and
wherein a weight-average molecular weight of the resin A is from 700,000 to 3,000,000:
(1) resin A: a polyvinylidene fluoride type resin that is a copolymer containing, as monomer components, vinylidene fluoride and hexafluoropropylene, wherein a molar content of a hexafluoropropylene monomer unit with respect to a total molar quantity of a vinylidene fluoride monomer unit and the hexafluoropropylene monomer unit is from more than 1.5 mol % to 3.5 mol %, and
(2) resin B2: a polyvinylidene fluoride type resin that is a copolymer containing, as monomer components, vinylidene fluoride and hexafluoropropylene, wherein a molar content of a hexafluoropropylene monomer unit with respect to a total molar quantity of a vinylidene fluoride monomer unit and the hexafluoropropylene monomer unit is from more than 3.5 mol % to 15 mol %.