US 12,261,322 B2
Electrochemical device separator including porous organic/inorganic composite coating layer and electrochemical device including same
Kyung Ryun Ka, Daejeon (KR); Min Ji Kim, Daejeon (KR); Seung Hyun Lee, Daejeon (KR); and Dong Wook Sung, Daejeon (KR)
Assigned to LG ENERGY SOLUTION, LTD., Seoul (KR)
Appl. No. 18/562,584
Filed by LG ENERGY SOLUTION, LTD., Seoul (KR)
PCT Filed Feb. 23, 2023, PCT No. PCT/KR2023/002570
§ 371(c)(1), (2) Date Nov. 20, 2023,
PCT Pub. No. WO2023/243806, PCT Pub. Date Dec. 21, 2023.
Claims priority of application No. 10-2022-0072646 (KR), filed on Jun. 15, 2022.
Prior Publication US 2024/0332736 A1, Oct. 3, 2024
This patent is subject to a terminal disclaimer.
Int. Cl. H01M 50/451 (2021.01); H01M 10/052 (2010.01); H01M 50/403 (2021.01); H01M 50/42 (2021.01); H01M 50/426 (2021.01); H01M 50/446 (2021.01); H01M 50/449 (2021.01)
CPC H01M 50/451 (2021.01) [H01M 10/052 (2013.01); H01M 50/403 (2021.01); H01M 50/42 (2021.01); H01M 50/426 (2021.01); H01M 50/446 (2021.01); H01M 50/449 (2021.01)] 20 Claims
OG exemplary drawing
 
1. A separator for an electrochemical device, the separator comprising a porous polymer substrate and a porous organic/inorganic composite coating layer formed on at least one side of the polymer substrate, wherein the porous organic/inorganic composite coating layer comprises particulate binder polymers and first inorganic particles,
the particulate binder polymers comprise hybrid polymer particles of a fluorine-based polymer and an acrylic-based polymer and acrylic-based polymer particles,
the porous organic/inorganic composite coating layer comprises a non-particulate acrylic-based polymer,
the acrylic-based polymer particles have a particle size D50“a” in a range of 1 μm to 7 μm,
the first inorganic particles have a particle size D50 “b” in a range of 200 to 800 nm,
a/b is in a range of 2 to 15, and
hybrid polymer particles have a particle size D50 of 250 nm or less.