US 11,990,642 B2
Separator for electrochemical device and method for manufacturing the same
Young-Bok Kim, Daejeon (KR); Dong-Wook Sung, Daejeon (KR); and So-Mi Jeong, Daejeon (KR)
Assigned to LG ENERGY SOLUTION, LTD., Seoul (KR)
Appl. No. 17/255,825
Filed by LG CHEM, LTD., Seoul (KR)
PCT Filed Sep. 27, 2019, PCT No. PCT/KR2019/012607
§ 371(c)(1), (2) Date Dec. 23, 2020,
PCT Pub. No. WO2020/067778, PCT Pub. Date Apr. 2, 2020.
Claims priority of application No. 10-2018-0116542 (KR), filed on Sep. 28, 2018.
Prior Publication US 2021/0280945 A1, Sep. 9, 2021
Int. Cl. H01M 50/449 (2021.01); H01G 11/52 (2013.01); H01M 50/403 (2021.01); H01M 50/42 (2021.01); H01M 50/426 (2021.01); H01M 50/443 (2021.01); H01M 50/446 (2021.01); H01M 50/46 (2021.01); H01M 50/489 (2021.01)
CPC H01M 50/449 (2021.01) [H01G 11/52 (2013.01); H01M 50/403 (2021.01); H01M 50/42 (2021.01); H01M 50/426 (2021.01); H01M 50/443 (2021.01); H01M 50/446 (2021.01); H01M 50/461 (2021.01); H01M 50/489 (2021.01)] 16 Claims
OG exemplary drawing
 
1. A separator for an electrochemical device which comprises:
a porous polymer substrate; and
an inorganic coating layer formed on at least one surface of the porous polymer substrate,
wherein the inorganic coating layer comprises inorganic particles and a binder resin,
wherein the binder resin comprises a first binder resin and a second binder resin,
wherein the first binder resin comprises a polyvinylidene fluoride (PVdF)-based polymer and the second binder resin comprises an acrylic polymer,
wherein the acrylic polymer has an acid value of 1 or less and a glass transition temperature, Tg, of 90° C. to 130° C., and
wherein a portion of the inorganic coating layer at a surface of the inorganic coating layer opposite to the porous polymer substrate forms an electrode adhesive portion, wherein the electrode adhesive portion has a content of binder resin that is higher than a content of binder resin in the remainder of the inorganic coating layer adjacent to the porous polymer substrate.