US 12,002,987 B2
Separator for rechargeable lithium battery and rechargeable lithium battery comprising same
Minho Cho, Yongin-si (KR); Hana Kim, Yongin-si (KR); Myungkook Park, Yongin-si (KR); Seung Rim Yang, Seongnam-si (KR); Byungmin Lee, Yongin-si (KR); Jungsue Jang, Yongin-si (KR); and Bokyung Jung, Suwon-si (KR)
Assigned to Samsung SDI Co., Ltd., Yongin-si (KR); and Samsung Electronics Co., Ltd., Suwon-si (KR)
Appl. No. 17/055,507
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/KR2019/003545
§ 371(c)(1), (2) Date Nov. 13, 2020,
PCT Pub. No. WO2019/221381, PCT Pub. Date Nov. 21, 2019.
Claims priority of application No. 10-2018-0057196 (KR), filed on May 18, 2018.
Prior Publication US 2021/0226298 A1, Jul. 22, 2021
Int. Cl. H01M 50/417 (2021.01); H01M 4/62 (2006.01); H01M 10/0525 (2010.01); H01M 50/409 (2021.01); H01M 50/42 (2021.01); H01M 50/434 (2021.01); H01M 50/443 (2021.01); H01M 50/446 (2021.01); H01M 50/457 (2021.01); H01M 50/46 (2021.01); H01M 50/489 (2021.01)
CPC H01M 50/417 (2021.01) [H01M 4/622 (2013.01); H01M 10/0525 (2013.01); H01M 50/409 (2021.01); H01M 50/42 (2021.01); H01M 50/434 (2021.01); H01M 50/443 (2021.01); H01M 50/446 (2021.01); H01M 50/457 (2021.01); H01M 50/461 (2021.01); H01M 50/489 (2021.01)] 13 Claims
OG exemplary drawing
 
1. A separator for a rechargeable lithium battery, comprising
a porous substrate, and
an adhesive layer on the porous substrate,
wherein the adhesive layer includes a particle-type binder having a core-shell structure including a core and a shell surrounding the core,
the core includes a first polymer having a glass transition temperature of less than or equal to 30° C.,
the shell includes a second polymer having a glass transition temperature of greater than or equal to 40° C.,
the particle-type binder has a diameter of 50 nm to 500 nm,
wherein the particle-type binder includes one or more (meth)acrylate structural units represented by Chemical Formula 1; at least one selected from among a phenyl group-containing structural unit represented by Chemical Formula 2 and a cyano group-containing structural unit represented by Chemical Formula 3; and an ester group-containing structural unit represented by Chemical Formula 4:

OG Complex Work Unit Chemistry
wherein, in Chemical Formula 1,
R1 is hydrogen or a C1 to C5 alkyl group,
R2 is a C1 to C10 alkyl group,
* is a linking point;

OG Complex Work Unit Chemistry
wherein, in Chemical Formula 2 to Chemical Formula 4,
R3 to R5 are independently hydrogen or a C1 to C5 alkyl group,
R6 is a C1 to C10 alkyl group,
Ra to Re are independently hydrogen or a C1 to C5 alkyl group,
L1 to L3 are independently a C1 to C5 alkyl group,
x, y, and z are independently an integer of 0 to 2, and
* is a linking point, and
wherein the first polymer includes 0 to 0.2 mole of the phenyl group-containing structural unit represented by Chemical Formula 2 or the cyano group-containing structural unit represented by Chemical Formula 3 and 0.5 mole to 0.8 mole of the ester group-containing structural unit represented by Chemical Formula 4 based on 1 mole of the (meth)acrylate structural unit represented by Chemical Formula 1.