US 12,176,575 B2
Coating composition for separator of secondary battery and method of manufacturing the same
Young-Gi Lee, Daejeon (KR); Ju Young Kim, Sejong-si (KR); Seok Hun Kang, Daejeon (KR); Kwang Man Kim, Daejeon (KR); Young Sam Park, Daejeon (KR); and Dong Ok Shin, Sejong-si (KR)
Assigned to Electronics and Telecommunications Research Institute, Daejeon (KR)
Filed by Electronics and Telecommunications Research Institute, Daejeon (KR)
Filed on Oct. 20, 2021, as Appl. No. 17/506,174.
Claims priority of application No. 10-2020-0140515 (KR), filed on Oct. 27, 2020.
Prior Publication US 2022/0131233 A1, Apr. 28, 2022
Int. Cl. H01M 50/451 (2021.01); C09D 5/02 (2006.01); C09D 133/02 (2006.01); C09D 133/06 (2006.01); H01M 50/403 (2021.01)
CPC H01M 50/451 (2021.01) [C09D 5/022 (2013.01); C09D 5/028 (2013.01); C09D 133/02 (2013.01); C09D 133/064 (2013.01); H01M 50/403 (2021.01)] 18 Claims
OG exemplary drawing
 
1. A method of preparing a coating composition for a separator of a secondary battery, the method comprising:
dispersing a first monomer and a surfactant in a solvent to form micelles;
adding a first initiator to the solvent and performing first polymerization reaction to form a precursor solution comprising a core portion; and
adding a second monomer and a second initiator to the precursor solution and performing second polymerization reaction to form a binder solution comprising a binder particle, wherein the binder particle comprising the core portion and a shell portion wrapping the core portion and the shell portion comprises:
a coating layer wrapping the surface of the core portion; and
a polymer chain crosslinked to the coating layer at an end of the polymer chain and extending radially outward from the coating layer,
wherein the polymer chain is water-soluble, and
the core portion and the shell portion are chemically bonded.