US 11,936,065 B2
Separator including polyethylene with highly entangled polymer chains, and electrochemical device including the same
Su-Jin Park, Daejeon (KR); and Sang-Joon Lee, Daejeon (KR)
Assigned to LG ENERGY SOLUTION, LTD., Seoul (KR)
Appl. No. 17/056,919
Filed by LG CHEM, LTD., Seoul (KR)
PCT Filed Jul. 12, 2019, PCT No. PCT/KR2019/008682
§ 371(c)(1), (2) Date Nov. 19, 2020,
PCT Pub. No. WO2020/013671, PCT Pub. Date Jan. 16, 2020.
Claims priority of application No. 10-2018-0081893 (KR), filed on Jul. 13, 2018.
Prior Publication US 2021/0210818 A1, Jul. 8, 2021
Int. Cl. H01M 50/417 (2021.01); C08J 9/26 (2006.01); C08J 9/36 (2006.01); H01M 10/0525 (2010.01); H01M 50/403 (2021.01); H01M 50/443 (2021.01); H01M 50/451 (2021.01); H01M 50/46 (2021.01); H01M 50/489 (2021.01); H01M 50/491 (2021.01)
CPC H01M 50/417 (2021.01) [C08J 9/26 (2013.01); C08J 9/365 (2013.01); H01M 10/0525 (2013.01); H01M 50/403 (2021.01); H01M 50/443 (2021.01); H01M 50/451 (2021.01); H01M 50/46 (2021.01); H01M 50/489 (2021.01); H01M 50/491 (2021.01); C08J 2201/0462 (2013.01); C08J 2323/06 (2013.01); C08J 2401/28 (2013.01)] 14 Claims
OG exemplary drawing
 
1. A separator for an electrochemical device comprising:
a porous substrate,
wherein the porous substrate has a porosity of 40% to 70%,
wherein the porous substrate has a mean pore size of 20 nm to 35 nm,
wherein the porous substrate comprises polyethylene having a weight average molecular weight in a range of 200,000 to 500,000, and
wherein the polyethylene has an entangle molecular weight of 2,500 g/mol or less, and
wherein the porous substrate has two peaks comprising a first peak at 130° C. to less than 145° C. and a second peak at 145° C. to 160′C upon an initial scanning in a differential scanning calorimetry (DSC) curve, and
wherein the second peak appears only upon the initial scanning in DSC analysis and is not identified upon a second or later scanning.