	US 12,113,221 B2
	Binder composition for secondary battery positive electrode, conductive material paste composition for secondary battery positive electrode, slurry composition for secondary battery positive electrode, positive electrode for secondary battery and method of producing same, and secondary battery
Shinsuke Sugawara, Tokyo (JP); and Naoki Takahashi, Tokyo (JP)
Assigned to ZEON CORPORATION, Tokyo (JP)
Appl. No. 17/595,315
Filed by ZEON CORPORATION, Tokyo (JP)
PCT Filed May 19, 2020, PCT No. PCT/JP2020/019818 § 371(c)(1), (2) Date Nov. 15, 2021, PCT Pub. No. WO2020/241383, PCT Pub. Date Dec. 3, 2020.
Claims priority of application No. 2019-102593 (JP), filed on May 31, 2019.
Prior Publication US 2022/0190341 A1, Jun. 16, 2022
Int. Cl. H01M 4/62 (2006.01); C08F 212/10 (2006.01); C08F 220/42 (2006.01); H01M 4/02 (2006.01); H01M 4/04 (2006.01); H01M 10/0569 (2010.01)

CPC H01M 4/622 (2013.01) [C08F 212/10 (2013.01); C08F 220/42 (2013.01); H01M 4/0416 (2013.01); H01M 10/0569 (2013.01); H01M 2004/028 (2013.01)]

10 Claims

1. A binder composition for a secondary battery positive electrode comprising a polymer, wherein

the polymer includes a nitrile group-containing monomer unit and a linear alkylene structural unit having a carbon number of 4 or more,

the polymer has a nitric acid content of 30 ppm or less by mass, and

when the polymer is subjected to an extraction, an extract of the polymer has a pH of 5.5 or higher, where the extraction is performed by preparing an 8 mass % N-methyl-2-pyrrolidone solution of the polymer, diluting the solution by a factor of 10 with deionized water, and extracting liquid encapsulated in the polymer by pressing the polymer.