US 11,967,732 B2
Separation membrane for lithium secondary battery and lithium secondary battery including same
Won Kyung Shin, Daejeon (KR); Kyoung Ho Ahn, Daejeon (KR); and Chul Haeng Lee, Daejeon (KR)
Assigned to LG ENERGY SOLUTION, LTD., Seoul (KR)
Appl. No. 17/044,370
Filed by LG CHEM, LTD., Seoul (KR)
PCT Filed Apr. 29, 2019, PCT No. PCT/KR2019/005146
§ 371(c)(1), (2) Date Oct. 1, 2020,
PCT Pub. No. WO2019/209087, PCT Pub. Date Oct. 31, 2019.
Claims priority of application No. 10-2018-0049375 (KR), filed on Apr. 27, 2018.
Prior Publication US 2021/0104802 A1, Apr. 8, 2021
Int. Cl. H01M 50/446 (2021.01); H01M 4/62 (2006.01); H01M 10/0525 (2010.01); H01M 10/0565 (2010.01)
CPC H01M 50/446 (2021.01) [H01M 4/622 (2013.01); H01M 10/0525 (2013.01); H01M 10/0565 (2013.01)] 10 Claims
OG exemplary drawing
 
1. A separation membrane for a lithium secondary battery, the separation membrane comprising:
a substrate;
a first coating layer containing a first organic binder which is able to be bonded to a gel polymer electrolyte through an epoxy ring-opening reaction; and
a second coating layer containing a second organic binder,
wherein the first organic binder is substituted with epoxy group, a functional group capable of ring-opening reaction with an epoxy group, or a combination thereof, and
the gel polymer electrolyte is formed by polymerizing an oligomer having an epoxy group, a functional group capable of ring-opening reaction with an epoxy group, or a combination thereof.