	US 12,266,821 B2
	Composite separator for electrochemical device and electrochemical device including the same
Joo-Sung Lee, Daejeon (KR); Bong-Tae Kim, Daejeon (KR); and Kil-An Jung, Daejeon (KR)
Assigned to LG CHEM, LTD., Seoul (KR)
Appl. No. 17/631,292
Filed by LG CHEM, LTD., Seoul (KR)
PCT Filed Jul. 29, 2020, PCT No. PCT/KR2020/010026 § 371(c)(1), (2) Date Jan. 28, 2022, PCT Pub. No. WO2021/020887, PCT Pub. Date Feb. 4, 2021.
Claims priority of application No. 10-2019-0092560 (KR), filed on Jul. 30, 2019.
Prior Publication US 2022/0263194 A1, Aug. 18, 2022
Int. Cl. H01M 10/44 (2006.01); H01M 10/0525 (2010.01); H01M 50/446 (2021.01)

CPC H01M 50/446 (2021.01) [H01M 10/0525 (2013.01)]

11 Claims

1. A composite separator for an electrochemical device, comprising:

a porous polymer substrate having a plurality of pores; and

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

wherein the porous coating layer comprises a plurality of particles and a binder positioned on at least a part of the surface of the particles to connect and fix the particles with one another,

wherein the particles are inorganic particles having an average particle diameter of 10 nm to 380 nm,

a ratio (a/b) of an average diameter (a) of pores formed in the porous coating layer to an average diameter (b) of pores formed in the porous polymer substrate is 2.0 or less, and

wherein the composite separator has a melt-down temperature of 170° C. or higher.