US 11,955,660 B2
Separator for lithium secondary battery, manufacturing method therefor, and lithium secondary battery including same
Jungsue Jang, Yongin-si (KR); Byungmin Lee, Yongin-si (KR); Hana Kim, Yongin-si (KR); Myungkook Park, Yongin-si (KR); Seung Rim Yang, Seongnam-si (KR); Bokyung Jung, Suwon-si (KR); and Minho Cho, Yongin-si (KR)
Assigned to SAMSUNG SDI CO., LTD., Yongin-si (KR); and SAMSUNG ELECTRONICS CO., LTD., Suwon-si (KR)
Appl. No. 17/052,500
Filed by Samsung SDI Co., Ltd., Yongin-si (KR); and Samsung Electronics Co., Ltd., Suwon-si (KR)
PCT Filed Mar. 27, 2019, PCT No. PCT/KR2019/003544
§ 371(c)(1), (2) Date Nov. 2, 2020,
PCT Pub. No. WO2019/216548, PCT Pub. Date Nov. 14, 2019.
Claims priority of application No. 10-2018-0052643 (KR), filed on May 8, 2018.
Prior Publication US 2021/0184314 A1, Jun. 17, 2021
Int. Cl. H01M 50/449 (2021.01); H01M 10/0525 (2010.01); H01M 50/403 (2021.01); H01M 50/411 (2021.01); H01M 50/42 (2021.01); H01M 50/426 (2021.01); H01M 50/431 (2021.01); H01M 50/443 (2021.01); H01M 50/446 (2021.01); H01M 50/457 (2021.01); H01M 50/46 (2021.01); H01M 50/491 (2021.01)
CPC H01M 50/449 (2021.01) [H01M 10/0525 (2013.01); H01M 50/403 (2021.01); H01M 50/411 (2021.01); H01M 50/42 (2021.01); H01M 50/426 (2021.01); H01M 50/431 (2021.01); H01M 50/443 (2021.01); H01M 50/446 (2021.01); H01M 50/457 (2021.01); H01M 50/461 (2021.01); H01M 50/491 (2021.01)] 9 Claims
OG exemplary drawing
 
1. A separator for a lithium secondary battery, comprising:
a porous substrate;
a heat resistant layer disposed on at least one surface of the porous substrate, and including inorganic particles, wherein the heat resistant layer is prepared from a heat resistant layer coating liquid having a viscosity of 100 cp to 1000 cp;
a water-soluble polymer and a polyvinyl alcohol-based auxiliary binder, wherein the water-soluble polymer comprises an acryl-based binder, a cellulose-based binder, a vinylidenefluoride-based binder, or a combination thereof; and
a first adhesive layer disposed on the heat resistant layer and including a first organic polymer,
wherein the heat resistant layer includes 90 wt % to 99 wt % of the inorganic particles relative to a total weight of the heat resistant layer,
wherein a thickness of the heat resistant layer is 3.5 μm to 7 μm,
wherein a thickness of the first adhesive layer is 0.5 μm to 3.0 μm,
wherein a surface roughness of an interface formed between the heat resistant layer and the first adhesive layer is 1.0 μm to 4.0 μm,
wherein a surface roughness of one surface of the first adhesive layer exposed to the outside is 0.1 μm to 1.0 μm, and
wherein a peel strength between the electrodes and the separator is 0.1 gf/mm to 2.0 gf/mm.