US 11,923,496 B2
Separator for rechargeable lithium battery and rechargeable lithium battery including the same
Jungsue Jang, Suwon-si (KR); Minho Cho, Suwon-si (KR); Hana Kim, Suwon-si (KR); Myungkook Park, Suwon-si (KR); Seung Rim Yang, Seongnam-si (KR); Byungmin Lee, Suwon-si (KR); Bokyung Jung, Suwon-si (KR); and Rae Sung Kim, Hwaseong-si (KR)
Assigned to SAMSUNG SDI CO., LTD., Yongin-si (KR); and SAMSUNG ELECTRONICS CO., LTD., Suwon-si (KR)
Filed by SAMSUNG SDI CO., LTD., Yongin-si (KR); and SAMSUNG ELECTRONICS CO., LTD., Gyeonggi-do (KR)
Filed on Mar. 3, 2020, as Appl. No. 16/807,479.
Claims priority of application No. 10-2019-0025306 (KR), filed on Mar. 5, 2019.
Prior Publication US 2020/0287191 A1, Sep. 10, 2020
Int. Cl. H01M 50/446 (2021.01); H01M 10/052 (2010.01); H01M 50/414 (2021.01); H01M 50/42 (2021.01); H01M 50/451 (2021.01); H01M 50/417 (2021.01)
CPC H01M 10/052 (2013.01) [H01M 50/414 (2021.01); H01M 50/42 (2021.01); H01M 50/446 (2021.01); H01M 50/451 (2021.01); H01M 50/417 (2021.01)] 15 Claims
OG exemplary drawing
 
1. A separator for a rechargeable lithium battery, the separator comprising:
a porous substrate; and
a coating layer on at least one surface of the porous substrate,
wherein:
the coating layer includes a binder and inorganic particles, the binder including:
a polyether polyurethane,
a polyvinyl alcohol, and
a cross-linking agent,
the polyether polyurethane and the polyvinyl alcohol are included in a weight ratio of 5:5 to 9:1,
the cross-linking agent includes a carbodiimide compound,
the cross-linking agent is bound to the polyether polyurethane to form a cross-linked polymer, and
a weight average molecular weight of the cross-linked polymer is 500 g/mol to 80,000 g/mol.