US 12,255,349 B2
Separator for secondary battery having excellent electrolyte impregnation
Kyung Ryun Ka, Daejeon (KR); Sang Joon Lee, Daejeon (KR); In Hyouk Sung, Daejeon (KR); and Je An Lee, Daejeon (KR)
Assigned to LG ENERGY SOLUTION, LTD., Seoul (KR)
Appl. No. 17/623,532
Filed by LG ENERGY SOLUTION, LTD., Seoul (KR)
PCT Filed Sep. 2, 2020, PCT No. PCT/KR2020/011799
§ 371(c)(1), (2) Date Dec. 28, 2021,
PCT Pub. No. WO2021/049812, PCT Pub. Date Mar. 18, 2021.
Claims priority of application No. 10-2019-0112581 (KR), filed on Sep. 11, 2019.
Prior Publication US 2022/0416361 A1, Dec. 29, 2022
Int. Cl. H01M 50/42 (2021.01); C09D 133/08 (2006.01); H01M 50/446 (2021.01); H01M 50/449 (2021.01)
CPC H01M 50/42 (2021.01) [C09D 133/08 (2013.01); H01M 50/446 (2021.01); H01M 50/449 (2021.01)] 9 Claims
OG exemplary drawing
 
1. A separator for a secondary battery, comprising:
a separator substrate; and
a coating layer on at least one surface of the separator substrate,
wherein the coating layer comprises an acrylate-based binder and an additive,
wherein the additive is a fluorine-based non-ionic surfactant,
wherein an amount of the acrylate-based binder present is 10 wt % or less based on a total weight of solid content in the coating layer excluding the additive,
wherein an amount of the fluorine-based non-ionic surfactant present is 0.001 wt % or less based on a total of an inorganic material and the acrylate-based binder in the coating layer, and
a density of the coating layer is 2 g/m3 or less.