US 12,237,536 B2
Separator for lithium secondary battery and lithium secondary battery comprising same
Yongkyoung Kim, Yongin-si (KR); Gain Kim, Yongin-si (KR); Jungyoon Lee, Yongin-si (KR); Yeonjoo Choi, Yongin-si (KR); and Yangseob Kim, Yongin-si (KR)
Assigned to Samsung SDI Co., Ltd., Yongin-si (KR)
Appl. No. 17/296,516
Filed by Samsung SDI Co., Ltd., Yongin-si (KR)
PCT Filed Aug. 9, 2019, PCT No. PCT/KR2019/010130
§ 371(c)(1), (2) Date May 24, 2021,
PCT Pub. No. WO2020/138628, PCT Pub. Date Jul. 2, 2020.
Claims priority of application No. 10-2018-0173101 (KR), filed on Dec. 28, 2018.
Prior Publication US 2022/0029244 A1, Jan. 27, 2022
Int. Cl. H01M 50/449 (2021.01); C08K 3/013 (2018.01); C08L 25/14 (2006.01); C08L 33/02 (2006.01); C08L 33/08 (2006.01); C08L 33/26 (2006.01); H01M 50/411 (2021.01); H01M 50/443 (2021.01); H01M 50/446 (2021.01)
CPC H01M 50/449 (2021.01) [C08K 3/013 (2018.01); C08L 25/14 (2013.01); C08L 33/02 (2013.01); C08L 33/08 (2013.01); C08L 33/26 (2013.01); H01M 50/411 (2021.01); H01M 50/443 (2021.01); H01M 50/446 (2021.01)] 15 Claims
OG exemplary drawing
 
1. A separator for a lithium secondary battery, comprising
a porous substrate, and
a coating layer on at least one surface of the porous substrate,
wherein the coating layer includes a heat-resistant binder including a (meth) acrylic copolymer including a first structural unit derived from (meth) acrylamide, and a second structural unit including a structural unit derived from (meth) acrylic acid or (meth) acrylate, and/or including a structural unit derived from (meth) acrylamidosulfonic acid or a salt thereof;
an adhesive binder having a core-shell structure; and
inorganic particles,
wherein the adhesive binder has an average particle diameter of 0.2 μm to 1.0 μm, and
the inorganic particles have an average particle diameter of 0.2 μm to 1.0 μm,
wherein
the coating layer includes
a heat-resistant layer on the porous substrate, and
an adhesive layer on the heat-resistant layer,
wherein the heat-resistant binder is included in the heat-resistant layer, and
the adhesive binder is included in the adhesive layer and the adhesive layer does not include the heat-resistant binder.