US 12,355,082 B2
Binder composition for secondary battery, slurry composition for secondary battery, functional layer for secondary battery, and secondary battery
Yusaku Matsuo, Tokyo (JP)
Assigned to ZEON CORPORATION, Tokyo (JP)
Appl. No. 17/755,045
Filed by ZEON CORPORATION, Tokyo (JP)
PCT Filed Oct. 5, 2020, PCT No. PCT/JP2020/037779
§ 371(c)(1), (2) Date Apr. 20, 2022,
PCT Pub. No. WO2021/085044, PCT Pub. Date May 6, 2021.
Claims priority of application No. 2019-199238 (JP), filed on Oct. 31, 2019.
Prior Publication US 2022/0384815 A1, Dec. 1, 2022
Int. Cl. H01M 4/62 (2006.01); C08F 220/18 (2006.01); C08L 33/08 (2006.01)
CPC H01M 4/622 (2013.01) [C08F 220/1804 (2020.02); C08L 33/08 (2013.01)] 7 Claims
 
1. A binder composition comprising a polymer and a solvent, wherein
the polymer includes a (meth)acrylic acid ester monomer unit including an aromatic hydrocarbon ring in a proportion of not less than 5 mass % and not more than 25 mass % and includes a structural unit indicated by formula (I), shown below, in a proportion of not less than 50 mass % and not more than 90 mass %,

OG Complex Work Unit Chemistry
where, in formula (I), R1 represents a hydrocarbon group having a carbon number of 4 or more that does not include an aromatic hydrocarbon ring, R2 represents a hydrogen atom, a methyl group, or —CH2—C(═O)—O—R1, and in a case in which more than one R1 is present in formula (I), each R1 may be the same or different,
wherein the (meth)acrylic acid ester monomer unit is one or more selected from a group consisting of a phenoxyethyl (meth)acrylate unit, a phenyl (meth)acrylate unit, and an ethoxylated o-phenylphenol (meth)acrylate unit.