	US 11,735,737 B2
	Binder for electricity storage devices improving dispersibility of conductive assistant
Kaho Mori, Kawagoe (JP); Tomoyuki Mori, Kawagoe (JP); Kazuki Takimoto, Kawagoe (JP); Masahiro Takano, Kawagoe (JP); and Kei Kawano, Kawagoe (JP)
Assigned to FUJIFILM WAKO PURE CHEMICAL CORPORATION, Osaka (JP)
Appl. No. 17/637,650
Filed by FUJIFILM WAKO PURE CHEMICAL CORPORATION, Osaka (JP)
PCT Filed Aug. 28, 2020, PCT No. PCT/JP2020/032585 § 371(c)(1), (2) Date Feb. 23, 2022, PCT Pub. No. WO2021/039959, PCT Pub. Date Mar. 4, 2021.
Claims priority of application No. 2019-156698 (JP), filed on Aug. 29, 2019; application No. 2020-057233 (JP), filed on Mar. 27, 2020; and application No. 2020-125295 (JP), filed on Jul. 22, 2020.
Prior Publication US 2022/0190343 A1, Jun. 16, 2022
Int. Cl. H01M 4/133 (2010.01); H01B 1/24 (2006.01); C08F 220/06 (2006.01); H01M 4/62 (2006.01); C08L 33/08 (2006.01); C08L 33/10 (2006.01); H01M 4/134 (2010.01); C08F 220/28 (2006.01); H01G 11/06 (2013.01); H01G 11/38 (2013.01); H01M 10/0525 (2010.01); H01M 4/02 (2006.01)

CPC H01M 4/622 (2013.01) [C08F 220/06 (2013.01); C08F 220/281 (2020.02); C08L 33/08 (2013.01); C08L 33/10 (2013.01); H01B 1/24 (2013.01); H01G 11/06 (2013.01); H01G 11/38 (2013.01); H01M 4/133 (2013.01); H01M 4/134 (2013.01); H01M 4/625 (2013.01); H01M 10/0525 (2013.01); C08F 2800/20 (2013.01); H01M 2004/021 (2013.01)]

11 Claims

1. A binder for an electricity storage device, wherein a loss tangent tan δ in a linear region of an aqueous dispersion liquid of 0.5% by mass of the binder and 4.6% by mass of a conductive assistant satisfies tan δ>1 in a strain dispersion measurement under measurement conditions of a measurement temperature of 25° C. and a frequency of 1 Hz,

wherein the conductive assistant is an acetylene black having an average particle diameter of 30 nm or more and 40 nm or less and a specific surface area of 65 m²/g or more and 70 m²/g or less.