	US 11,967,731 B2
	Separator for electrochemical device and electrochemical device containing same
In-Hyouk Sung, Daejeon (KR); Hye-Jin Kwon, Daejeon (KR); and Dong-Wook Sung, Daejeon (KR)
Assigned to LG ENERGY SOLUTION, LTD., Seoul (KR)
Appl. No. 17/042,520
Filed by LG CHEM, LTD., Seoul (KR)
PCT Filed Dec. 20, 2019, PCT No. PCT/KR2019/018234 § 371(c)(1), (2) Date Sep. 28, 2020, PCT Pub. No. WO2020/130723, PCT Pub. Date Jun. 25, 2020.
Claims priority of application No. 10-2018-0167923 (KR), filed on Dec. 21, 2018.
Prior Publication US 2021/0028428 A1, Jan. 28, 2021
Int. Cl. H01M 50/44 (2021.01); H01M 4/62 (2006.01); H01M 10/05 (2010.01); H01M 10/0525 (2010.01); H01M 50/443 (2021.01); H01M 50/446 (2021.01); H01M 50/48 (2021.01); H01M 50/489 (2021.01)

CPC H01M 50/446 (2021.01) [H01M 4/622 (2013.01); H01M 10/0525 (2013.01); H01M 50/443 (2021.01); H01M 50/489 (2021.01)]

12 Claims

1. A separator for an electrochemical device, comprising:

a porous polymer substrate having a plurality of pores; and

a porous coating layer on at least one surface of the porous polymer substrate, wherein the porous coating layer comprises boehmite particles and a binder polymer, wherein the binder polymer is positioned on at least a part of a surface of the boehmite particles and connects and fixes the boehmite particles with one another,

wherein the boehmite particles have an average particle diameter of 2.0 μm to 3.5 μm and a specific surface area of 4.0 m²/g to 4.5 m²/g,

wherein the porous coating layer has a thickness of 2 μm to 10 μm, and

wherein an adhesion strength of the separator to an electrode (Lami strength) is 20 gf/15 mm or more, and a resistance of the separator is 0.90 ohm or less.