US 12,278,374 B2
Carbon nanotube dispersion liquid for nonaqueous electrolyte secondary battery, resin composition using the same, mixture slurry, electrode film, and nonaqueous electrolyte secondary battery
Yu Morita, Tokyo (JP); Hirotomo Ito, Tokyo (JP); Yu Aotani, Tokyo (JP); and Tetsuro Izumiya, Tokyo (JP)
Assigned to artience Co., Ltd., Tokyo (JP); and TOYOCOLOR CO., LTD., Tokyo (JP)
Appl. No. 17/771,004
Filed by artience Co., Ltd., Tokyo (JP); and TOYOCOLOR CO., LTD., Tokyo (JP)
PCT Filed Oct. 23, 2020, PCT No. PCT/JP2020/039972
§ 371(c)(1), (2) Date Apr. 21, 2022,
PCT Pub. No. WO2021/080006, PCT Pub. Date Apr. 29, 2021.
Claims priority of application No. 2019-193681 (JP), filed on Oct. 24, 2019; and application No. 2020-110335 (JP), filed on Jun. 26, 2020.
Prior Publication US 2022/0376262 A1, Nov. 24, 2022
Int. Cl. B32B 9/00 (2006.01); C01B 32/174 (2017.01); H01M 4/62 (2006.01); H01M 4/02 (2006.01)
CPC H01M 4/625 (2013.01) [C01B 32/174 (2017.08); H01M 4/622 (2013.01); C01B 2202/22 (2013.01); C01B 2202/32 (2013.01); C01B 2202/34 (2013.01); C01B 2202/36 (2013.01); C01P 2002/72 (2013.01); C01P 2002/82 (2013.01); H01M 2004/021 (2013.01); Y10T 428/30 (2015.01)] 16 Claims
 
1. A carbon nanotube dispersion liquid for nonaqueous electrolyte secondary battery, being a carbon nanotube dispersion liquid containing carbon nanotubes, a dispersant and a solvent, and being characterized in satisfying (1) to (4) below:
(1) an average outer diameter of the carbon nanotubes ranging from more than 3 nm to 25 nm;
(2) a BET surface area of the carbon nanotubes ranging from 150 m2/g to 800 m2/g; and
(3) a fiber length of the carbon nanotubes in the carbon nanotube dispersion liquid ranging from 0.8 μm to 3.5 μm,
(4) a complex elastic modulus of the carbon nanotube dispersion liquid is 50 Pa or less, and a phase angle of the carbon nanotube dispersion liquid is from 10° to 50°.