US 12,451,560 B2
Polyolefin separator and method for manufacturing the same
Sung-Jae Han, Daejeon (KR); Joo-Sung Lee, Daejeon (KR); Won-Sik Bae, Daejeon (KR); and Bi-Oh Ryu, Daejeon (KR)
Assigned to LG Chem, Ltd., Seoul (KR)
Appl. No. 17/441,367
Filed by LG Chem, Ltd., Seoul (KR)
PCT Filed Mar. 20, 2020, PCT No. PCT/KR2020/003910
§ 371(c)(1), (2) Date Sep. 21, 2021,
PCT Pub. No. WO2020/197198, PCT Pub. Date Oct. 1, 2020.
Claims priority of application No. 10-2019-0033188 (KR), filed on Mar. 22, 2019.
Prior Publication US 2022/0173479 A1, Jun. 2, 2022
Int. Cl. H01M 50/403 (2021.01); H01M 50/409 (2021.01); H01M 50/417 (2021.01); H01M 50/449 (2021.01); H01M 50/489 (2021.01); H01M 50/491 (2021.01)
CPC H01M 50/403 (2021.01) [H01M 50/409 (2021.01); H01M 50/417 (2021.01); H01M 50/449 (2021.01); H01M 50/491 (2021.01); H01M 50/489 (2021.01)] 19 Claims
OG exemplary drawing
 
1. A polyolefin separator, comprising:
a polyolefin porous substrate comprising a plurality of fibrils and pores formed by the fibrils draped across one another; and
coating layers surrounding an outer side of the fibrils contained in the polyolefin porous substrate and the coating layers comprising a crosslinked polymer,
wherein the coating layers surround the outside of the fibrils not only on the polyolefin separator surface but also inside the polyolefin separator, and are not separate coating layers differentiated from the porous substrate but are layers formed on the surface of each of the fibrils, and
wherein the polyolefin separator having the coating layers has a change in air permeability of 20% or less and a change in basis weight of 4% or less, as compared to the polyolefin porous substrate.