US 11,657,984 B2
Separator for electrochemical device, method for manufacturing same, and electrochemical device comprising same
Joo-Sung Lee, Daejeon (KR); and A-Young Lee, Daejeon (KR)
Assigned to LG Chem, Ltd.
Appl. No. 16/756,706
Filed by LG Chem, Ltd., Seoul (KR)
PCT Filed Jun. 7, 2019, PCT No. PCT/KR2019/006897
§ 371(c)(1), (2) Date Apr. 16, 2020,
PCT Pub. No. WO2019/245202, PCT Pub. Date Dec. 26, 2019.
Claims priority of application No. 10-2018-0071063 (KR), filed on Jun. 20, 2018.
Prior Publication US 2020/0259149 A1, Aug. 13, 2020
Int. Cl. H01G 11/52 (2013.01); H01G 11/84 (2013.01); H01M 10/0525 (2010.01); H01M 50/403 (2021.01); H01M 50/446 (2021.01); H01M 50/417 (2021.01); H01M 50/426 (2021.01); H01M 50/443 (2021.01); H01M 50/489 (2021.01); H01M 50/457 (2021.01)
CPC H01G 11/52 (2013.01) [H01G 11/84 (2013.01); H01M 10/0525 (2013.01); H01M 50/403 (2021.01); H01M 50/417 (2021.01); H01M 50/426 (2021.01); H01M 50/443 (2021.01); H01M 50/446 (2021.01); H01M 50/457 (2021.01); H01M 50/489 (2021.01)] 15 Claims
 
1. A separator for an electrochemical device, comprising:
a porous polymer substrate; and
a porous coating layer formed on at least one surface of the porous polymer substrate,
wherein the porous coating layer comprises inorganic particles, a first polyvinylidene fluoride copolymer and a second polyvinylidene fluoride copolymer,
G1′ (storage modulus) and G1″ (loss modulus) of the first polyvinylidene fluoride copolymer undergo a reverse transition,
G2′ (storage modulus) and G2″ (loss modulus) of the second polyvinylidene fluoride copolymer undergo no reverse transition, and
G1′ and G1″ of the first polyvinylidene fluoride copolymer undergo the reverse transition at a frequency of 0.5 Hz or less under a condition of a solution containing the first polyvinylidene fluoride copolymer at a solid content of 5 wt % in a solvent including N-methyl pyrrolidone and water mixed at a weight ratio of 90:10.