	US 12,424,705 B2
	Separator for lithium secondary battery, method for manufacturing same, and lithium secondary battery comprising same
So-Mi Jeong, Daejeon (KR); Min-Ji Kim, Daejeon (KR); and Da-Kyung Han, Daejeon (KR)
Assigned to LG ENERGY SOLUTION, LTD., Seoul (KR)
Appl. No. 17/908,394
Filed by LG ENERGY SOLUTION, LTD., Seoul (KR)
PCT Filed Mar. 31, 2021, PCT No. PCT/KR2021/004015 § 371(c)(1), (2) Date Aug. 31, 2022, PCT Pub. No. WO2021/201607, PCT Pub. Date Oct. 7, 2021.
Claims priority of application No. 10-2020-0041003 (KR), filed on Apr. 3, 2020.
Prior Publication US 2023/0098650 A1, Mar. 30, 2023
Int. Cl. H01M 50/449 (2021.01); H01M 10/052 (2010.01); H01M 10/42 (2006.01); H01M 50/403 (2021.01); H01M 50/417 (2021.01)

CPC H01M 50/449 (2021.01) [H01M 10/052 (2013.01); H01M 10/4235 (2013.01); H01M 50/403 (2021.01); H01M 50/417 (2021.01); H01M 2200/00 (2013.01)]

11 Claims

1. A separator for a lithium secondary battery, comprising:

a porous polymer substrate having a plurality of pores; and

a polymer coating layer on at least one surface of the porous polymer substrate,

wherein the polymer coating layer comprises a thermosetting phenol-containing resin having at least one hydroxyl group and at least one aromatic ring, and

a coating amount of the thermosetting phenol-containing resin is 0.01 g/m²to 3 g/m²of the porous polymer substrate based on one polymer coating layer,

wherein the thermosetting phenol-containing resin is configured to be thermally cured at 120° C. to 200° C. in the separator to form a network structure, and

wherein the separator does not comprise inorganic particles.