US 11,929,519 B2
Separator including coating layer with ethylenically unsaturated binder, and secondary battery including polymer network formed by gel polymer electrolyte and ethylenically unsaturated binder in coating layer of separator
Won Kyung Shin, Daejeon (KR); Kyoung Ho Ahn, Daejeon (KR); Chul Haeng Lee, Daejeon (KR); and Jae Won Lee, Daejeon (KR)
Assigned to LG ENERGY SOLUTION, LTD., Seoul (KR)
Appl. No. 16/768,929
Filed by LG CHEM, LTD., Seoul (KR)
PCT Filed Jan. 17, 2019, PCT No. PCT/KR2019/000722
§ 371(c)(1), (2) Date Jun. 2, 2020,
PCT Pub. No. WO2019/143155, PCT Pub. Date Jul. 25, 2019.
Claims priority of application No. 10-2018-0006795 (KR), filed on Jan. 18, 2018.
Prior Publication US 2021/0175584 A1, Jun. 10, 2021
Int. Cl. H01M 50/446 (2021.01); C08F 120/12 (2006.01); C09D 101/02 (2006.01); C09D 127/16 (2006.01); C09D 171/02 (2006.01); C09D 179/08 (2006.01); H01M 10/0525 (2010.01); H01M 10/0565 (2010.01); H01M 50/417 (2021.01); H01M 50/42 (2021.01); H01M 50/426 (2021.01); H01M 50/449 (2021.01); H01M 50/451 (2021.01); H01M 50/454 (2021.01)
CPC H01M 50/446 (2021.01) [C08F 120/12 (2013.01); C09D 101/02 (2013.01); C09D 127/16 (2013.01); C09D 171/02 (2013.01); C09D 179/08 (2013.01); H01M 10/0525 (2013.01); H01M 10/0565 (2013.01); H01M 50/42 (2021.01); H01M 50/449 (2021.01); H01M 50/451 (2021.01); H01M 50/417 (2021.01); H01M 50/426 (2021.01); H01M 50/454 (2021.01); H01M 2300/0082 (2013.01); H01M 2300/0085 (2013.01)] 13 Claims
 
1. A lithium secondary battery comprising:
a positive electrode;
a negative electrode;
a separator; and
a gel polymer electrolyte disposed between the positive electrode and the negative electrode and the separator, comprising a polymer of an oligomer containing a (meth)acrylate group,
wherein the separator, comprises:
a substrate; and
a coating layer formed on a surface of the substrate,
wherein
the coating layer includes an organic binder and inorganic particles,
the organic binder comprises an ethylenically unsaturated group positioned at an end portion or a side portion of a polymer including at least one unit selected from the group consisting of Formula X-1 and Formula X-2, and
the separator comprises a polymer network in a three-dimensional structure of a polymer of the organic binder containing the ethylenically unsaturated group and the oligomer containing a (meth)acrylate group:

OG Complex Work Unit Chemistry
wherein, in Formula X-1, m1 is an integer of 1 to 100,

OG Complex Work Unit Chemistry
wherein, in Formula X-2, m2 and m3 are each independently an integer of 1 to 100.