US 12,388,069 B2
Method of producing electrode, method of producing battery, electrode, and battery
Hikaru Yoshida, Ibaraki (JP); and Shigeki Matsuta, Kobe (JP)
Assigned to PRIME PLANET ENERGY & SOLUTIONS, INC., Tokyo (JP)
Filed by PRIME PLANET ENERGY & SOLUTIONS, INC., Tokyo (JP)
Filed on Sep. 23, 2021, as Appl. No. 17/482,580.
Claims priority of application No. 2020-178750 (JP), filed on Oct. 26, 2020.
Prior Publication US 2022/0131123 A1, Apr. 28, 2022
Int. Cl. H01M 4/04 (2006.01); H01M 4/02 (2006.01); H01M 4/62 (2006.01)
CPC H01M 4/0416 (2013.01) [H01M 4/043 (2013.01); H01M 4/0471 (2013.01); H01M 4/622 (2013.01); H01M 2004/021 (2013.01)] 18 Claims
OG exemplary drawing
 
1. A method of producing an electrode, comprising:
preparing a slurry by mixing active material particles, capsule-shaped particles, a binder, and an organic solvent;
applying the slurry to a surface of a substrate to form a coating film;
drying the coating film by heating to form an active material layer; and
compressing the active material layer to produce an electrode, wherein
each of the capsule-shaped particles includes a thermoplastic resin, the thermoplastic resin softens when heated in the presence of the organic solvent,
when the thermoplastic resin softens, the capsule-shaped particles shrink to form voids in the active material layer,
the binder includes at least one selected from the group consisting of polyvinylidene difluoride, poly(vinylidenefluoride-cohexafluoropropylene), polytetrafluoroethylene, polyacrylic acid, carboxymethylcellulose, polyethylene oxide, and styrene-butadiene rubber,
the thermoplastic resin comprises at least one of an acrylic-based resin, an acrylonitrile-based resin, or a vinylidenechloride-based resin, and
when the coating film is dried, the thermoplastic resin is heated together with the organic solvent, and heating temperature is in the range of from 60 to 150 degrees Celsius.