US 12,438,232 B2
Binder resin composition and separator for electrochemical device comprising the same
Myeong-Soo Kim, Daejeon (KR); and Su-Jin Yoon, Daejeon (KR)
Assigned to LG ENERGY SOLUTION, LTD., Seoul (KR)
Appl. No. 17/609,617
Filed by LG ENERGY SOLUTION, LTD., Seoul (KR)
PCT Filed Apr. 29, 2020, PCT No. PCT/KR2020/005786
§ 371(c)(1), (2) Date Nov. 8, 2021,
PCT Pub. No. WO2020/226367, PCT Pub. Date Nov. 12, 2020.
Claims priority of application No. 10-2019-0054534 (KR), filed on May 9, 2019.
Prior Publication US 2022/0220294 A1, Jul. 14, 2022
Int. Cl. H01M 50/42 (2021.01); C08L 27/16 (2006.01); C08L 31/04 (2006.01); C08L 39/06 (2006.01); H01M 50/426 (2021.01); H01M 50/443 (2021.01); H01M 50/449 (2021.01); H01M 50/489 (2021.01); H01M 50/491 (2021.01)
CPC H01M 50/426 (2021.01) [C08L 27/16 (2013.01); C08L 31/04 (2013.01); C08L 39/06 (2013.01); H01M 50/443 (2021.01); H01M 50/449 (2021.01); H01M 50/489 (2021.01); H01M 50/491 (2021.01)] 4 Claims
OG exemplary drawing
 
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 and a binder resin composition consisting of a PVDF-based polymer, PVP and PVP-co-PVAc,
wherein based on 100 wt % of the combined weight of the binder resin composition with the inorganic particles in the porous coating layer, the binder resin composition is present in an amount of 10-30 wt %, the PVDF-based polymer is 5-20 wt %, the PVP is 1-3 wt % and the PVP-co-PVAc is 5-10 wt %,
wherein the PVP-co-PVAc has a molecular weight (Mw) of from 800,000 g/mol to 1,000,000 g/mol and, the content of the PVAc polymerization units in PVP-co-PVAc is 50-80 wt % based on the PVP-co-PVAc.