US 12,412,959 B2
Separator for electrochemical device and electrochemical device including the same
Jin Young Shin, Daejeon (KR); So Mi Jeong, Daejeon (KR); Ji Hyun Bang, Daejeon (KR); and Won Sik Bae, Daejeon (KR)
Assigned to LG ENERGY SOLUTION, LTD., Seoul (KR)
Filed by LG ENERGY SOLUTION, LTD., Seoul (KR)
Filed on Mar. 6, 2024, as Appl. No. 18/597,783.
Claims priority of application No. 10-2023-0058002 (KR), filed on May 3, 2023.
Prior Publication US 2024/0372218 A1, Nov. 7, 2024
Int. Cl. H01M 50/457 (2021.01); H01M 4/02 (2006.01); H01M 4/134 (2010.01); H01M 10/0566 (2010.01); H01M 50/42 (2021.01); H01M 50/443 (2021.01); H01M 50/491 (2021.01)
CPC H01M 50/457 (2021.01) [H01M 4/134 (2013.01); H01M 10/0566 (2013.01); H01M 50/42 (2021.01); H01M 50/443 (2021.01); H01M 50/491 (2021.01); H01M 2004/021 (2013.01); H01M 2004/027 (2013.01); H01M 2300/0051 (2013.01)] 13 Claims
OG exemplary drawing
 
1. A separator for an electrochemical device, the separator comprising:
a porous polymer substrate;
a first coating layer provided on at least one surface of the porous polymer substrate and essentially consisting of a first polymer resin of a first solubility in an electrolyte; and
a second coating layer provided on the first coating layer and including a second polymer resin of a second solubility in the electrolyte, and inorganic particles,
wherein the first solubility is higher than the second solubility in the electrolyte,
the separator is provided on a negative electrode containing a silicon (Si), and
wherein a difference between a solubility parameter of the first polymer resin and a solubility parameter of the second polymer resin is 7 MPa1/2 or more and 100 MPa1/2 or less.