US 11,912,853 B2
Binder composition, method of producing binder composition, and method of producing all-solid-state battery
Naoki Osada, Toyota (JP); Shohei Kawashima, Toyota (JP); Ryosuke Furuya, Toyota (JP); Yoshiyuki Nagasawa, Tokyo (JP); and Mitsuyasu Sakuma, Tokyo (JP)
Assigned to TOYOTA JIDOSHA KABUSHIKI KAISHA, Toyota (JP); and KUREHA CORPORATION, Tokyo (JP)
Filed by TOYOTA JIDOSHA KABUSHIKI KAISHA, Toyota (JP); and KUREHA CORPORATION, Tokyo (JP)
Filed on Jun. 4, 2021, as Appl. No. 17/339,026.
Claims priority of application No. 2020-099959 (JP), filed on Jun. 9, 2020.
Prior Publication US 2021/0380791 A1, Dec. 9, 2021
Int. Cl. C08L 27/16 (2006.01); H01M 4/62 (2006.01); H01M 10/0525 (2010.01); H01M 50/403 (2021.01); H01M 50/449 (2021.01); C08J 3/28 (2006.01); H01M 10/0562 (2010.01)
CPC C08L 27/16 (2013.01) [C08J 3/28 (2013.01); H01M 4/623 (2013.01); H01M 10/0525 (2013.01); H01M 10/0562 (2013.01); H01M 50/403 (2021.01); H01M 50/449 (2021.01); H01M 2300/0068 (2013.01)] 5 Claims
OG exemplary drawing
 
1. A method of producing an all-solid-state battery, the method comprising:
preparing a slurry composition by mixing a binder composition with a sulfide-based solid electrolyte;
pulverizing an aggregate included in the slurry composition;
forming a separator by applying the slurry composition to a surface of a substrate and drying the slurry composition after pulverizing the aggregate; and
producing an all-solid-state battery including the separator, wherein
said binder composition consists essentially of 1 mass % to 15 mass % of a group of binder particles and the remainder of a dispersion medium,
the group of binder particles is dispersed in the dispersion medium,
the group of binder particles includes a polymer material,
the polymer material includes a constitutional unit originated from vinylidene difluoride,
the group of binder particles has a number-based particle size distribution, and
the number-based particle size distribution satisfies conditions of the following formulae (1) to (3):
0.19≤X≤0.26  (1),
0.69≤Y≤0.76  (2), and
0≤Z≤0.05  (3)
where
in the formula (1), X represents a frequency of particles each having a particle size of less than or equal to 40 μm,
in the formula (2), Y represents a frequency of particles each having a particle size of more than 40 μm and less than or equal to 110 μm, and
in the formula (3), Z represents a frequency of particles each having a particle size of more than 110 μm and less than or equal to 250 μm.