	US 11,990,643 B2
	Separator having inorganic composite layer including inorganic particles and one-dimensional inorganic material without polymer-based organic binder and electrochemical device using the same
Sang Yoon Ji, Daejeon (KR); Yun Bong Kim, Daejeon (KR); and Dong Yeon Lee, Daejeon (KR)
Assigned to SK Innovation Co., Ltd., Seoul (KR); and SK ie technology Co., Ltd., Seoul (KR)
Filed by SK Innovation Co., Ltd., Seoul (KR); and SK ie technology Co., Ltd., Seoul (KR)
Filed on Jul. 6, 2021, as Appl. No. 17/367,783.
Claims priority of application No. 10-2020-0083703 (KR), filed on Jul. 7, 2020; and application No. 10-2021-0074546 (KR), filed on Jun. 9, 2021.
Prior Publication US 2022/0013863 A1, Jan. 13, 2022
Int. Cl. H01M 50/451 (2021.01); H01M 10/0525 (2010.01); H01M 50/403 (2021.01); H01M 50/491 (2021.01)

CPC H01M 50/451 (2021.01) [H01M 10/0525 (2013.01); H01M 50/403 (2021.01); H01M 50/491 (2021.01)]

14 Claims

1. A separator comprising:

(a) a polyolefin-based porous substrate; and

(b) an inorganic composite layer formed on one surface or both surfaces of the porous substrate, and comprising one or more inorganic particles and one or more one-dimensional inorganic materials,

wherein the dimensions of the one or more inorganic particles and the one or more one-dimensional inorganic materials are different,

wherein the one or more one-dimensional inorganic materials comprise inorganic nanowire(s) and/or inorganic nanofiber(s),

wherein the one or more one-dimensional inorganic materials have a diameter of 1 to 100 nm, a length of 0.01 to 100 μm, and a length/diameter ratio (L/D) of 100 to 20,000

wherein a specific surface area of the one or more one-dimensional inorganic material is 50 to 4,000 m²/g,

wherein the one or more inorganic particles are bound to each other, and/or the inorganic composite layer is anchored and adhered to the porous substrate, by the one or more one-dimensional inorganic materials, and

the inorganic composite layer does not include a polymer-based organic binder.