US 12,462,989 B2
Cross-linked polyolefin separator and manufacturing method therefor
Bi-Oh Ryu, Daejeon (KR); Joo-Sung Lee, Daejeon (KR); and Won-Sik Bae, Daejeon (KR)
Assigned to LG Chem, Ltd., Seoul (KR)
Appl. No. 17/044,026
Filed by LG Chem, Ltd., Seoul (KR)
PCT Filed Nov. 29, 2019, PCT No. PCT/KR2019/016800
§ 371(c)(1), (2) Date Sep. 30, 2020,
PCT Pub. No. WO2020/130412, PCT Pub. Date Jun. 25, 2020.
Claims priority of application No. 10-2018-0167962 (KR), filed on Dec. 21, 2018.
Prior Publication US 2021/0125792 A1, Apr. 29, 2021
Int. Cl. H01G 11/52 (2013.01); B01D 67/00 (2006.01); B01D 71/02 (2006.01); B01D 71/26 (2006.01); B01D 71/70 (2006.01); B29C 48/91 (2019.01); B29K 23/00 (2006.01); B29K 105/24 (2006.01); C08F 8/42 (2006.01); C08J 3/24 (2006.01); H01M 50/443 (2021.01)
CPC H01G 11/52 (2013.01) [B01D 67/0079 (2013.01); B01D 67/00931 (2022.08); B01D 71/024 (2013.01); B01D 71/261 (2022.08); B01D 71/262 (2022.08); B01D 71/70 (2013.01); B29C 48/91 (2019.02); C08F 8/42 (2013.01); C08J 3/24 (2013.01); H01M 50/443 (2021.01); B29K 2023/065 (2013.01); B29K 2105/24 (2013.01); C08J 2323/04 (2013.01); C08L 2312/08 (2013.01)] 8 Claims
OG exemplary drawing
 
1. A method for manufacturing a crosslinked polyolefin separator, comprising the steps of:
hydrolyzing an alkoxysilane containing a carbon-carbon double bonded group with a solvent to obtain a silanol containing a carbon-carbon double bonded group, wherein the solvent is water, methanol, ethanol or propanol;
mixing the silanol containing a carbon-carbon double bonded group with inorganic particles having at least one hydroxy group at 50° C.-80° C. to obtain surface-treated inorganic particles;
mixing a polyolefin, a diluting agent, and the surface-treated inorganic particles in an extruder, and then adding an initiator and a crosslinking catalyst to obtain a mixture;
extruding the mixture to form an extruded silane-grafted polyolefin composition;
molding and orienting the extruded silane-grafted polyolefin composition in a form of an oriented sheet;
extracting the diluting agent from the oriented sheet to obtain a porous membrane;
thermally fixing the porous membrane to obtain a thermally fixed porous membrane; and
crosslinking the thermally fixed porous membrane in the presence of moisture,
wherein the inorganic particles are particles of a metal hydroxide, and the metal hydroxide is at least one of aluminum hydroxide, magnesium hydroxide, calcium hydroxide, or boehmite.