US 12,230,834 B2
Separator including porous substrate and coating layer of acrylic copolymer, organic filler, and inorganic particles, and lithium secondary battery including the same
Gain Kim, Yongin-si (KR); Yeonjoo Choi, Yongin-si (KR); Yangseob Kim, Yongin-si (KR); Yongkyoung Kim, Yongin-si (KR); Dongwan Seo, Yongin-si (KR); Jungyoon Lee, Yongin-si (KR); and Hyeonsun Choi, Yongin-si (KR)
Assigned to Samsung SDI Co., Ltd., Yongin-si (KR)
Appl. No. 17/414,043
Filed by Samsung SDI Co., Ltd., Yongin-si (KR)
PCT Filed Jul. 23, 2019, PCT No. PCT/KR2019/009085
§ 371(c)(1), (2) Date Jun. 15, 2021,
PCT Pub. No. WO2020/149478, PCT Pub. Date Jul. 23, 2020.
Claims priority of application No. 10-2019-0005932 (KR), filed on Jan. 16, 2019.
Prior Publication US 2022/0052419 A1, Feb. 17, 2022
Int. Cl. H01M 50/446 (2021.01); H01M 10/0525 (2010.01); H01M 50/443 (2021.01)
CPC H01M 50/446 (2021.01) [H01M 10/0525 (2013.01); H01M 50/443 (2021.01)] 13 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 comprises
an acrylic copolymer;
an organic filler; and
inorganic particles,
wherein the acrylic copolymer comprises a first structural unit derived from (meth)acrylamide, and a second structural unit derived from (meth)acrylic acid or (meth)acrylate, and a third structural unit derived from (meth)acrylamidosulfonic acid or a salt thereof represented by one selected from Chemical Formula 4, Chemical Formula 5, Chemical Formula 6, and a combination thereof,

OG Complex Work Unit Chemistry
wherein, in Chemical Formula 4 to Chemical Formula 6,
R4 to R6 are each independently hydrogen or a C1 to C6 alkyl group,
L1 to L3 are each independently a substituted or unsubstituted C3 to C10 alkylene group, a substituted or unsubstituted C3 to C20 cycloalkylene group, a substituted or unsubstituted C6 to C20 arylene group, or a substituted or unsubstituted C3 to C20 heterocyclic group,
a, b, and c are each independently one of integers of 1 or 2, and
M is an alkali metal,
wherein the organic filler is included in an amount of 0.1 to 50 wt % based on a total amount of the organic filler and the inorganic particles, and
wherein the first structural unit is included in an amount of 55 mol % to 95 mol % based on 100 mol % of the acrylic copolymer, and the total amount of the second structural unit and the third structural unit is included in an amount of 5 mol % to 45 mol % based on 100 mol % of the acrylic copolymer.