US 12,347,847 B2
Secondary battery electrode and method for producing the electrode
Haruka Shionoya, Toyota (JP); Katsushi Enokihara, Toyota (JP); Naohiro Mashimo, Toyota (JP); Masanori Kitayoshi, Toyota (JP); Shuhei Takeshita, Nagakute (JP); and Aiko Nagano, Nisshin (JP)
Assigned to PRIME PLANET ENERGY & SOLUTIONS, INC., Tokyo (JP)
Filed by Prime Planet Energy & Solutions, Inc., Tokyo (JP)
Filed on Mar. 7, 2022, as Appl. No. 17/688,748.
Claims priority of application No. 2021-039463 (JP), filed on Mar. 11, 2021.
Prior Publication US 2022/0293912 A1, Sep. 15, 2022
Int. Cl. H01M 4/1393 (2010.01); H01M 4/02 (2006.01); H01M 4/04 (2006.01); H01M 4/133 (2010.01); H01M 4/36 (2006.01); H01M 4/587 (2010.01); H01M 10/0525 (2010.01)
CPC H01M 4/1393 (2013.01) [H01M 4/0404 (2013.01); H01M 4/043 (2013.01); H01M 4/133 (2013.01); H01M 4/366 (2013.01); H01M 4/587 (2013.01); H01M 10/0525 (2013.01); H01M 2004/021 (2013.01); H01M 2004/027 (2013.01)] 4 Claims
OG exemplary drawing
 
1. A method for producing a secondary battery electrode, comprising:
a step of preparing a moisture powder that is formed of aggregated particles that at least contain a plurality of electrode active material particles, a binder resin, and solvent, wherein a solid phase, liquid phase, and gas phase in at least 50 number % or more of the aggregated particles in the moisture powder form a pendular state or a funicular state;
a step of forming, using the moisture powder, a coating film composed of the moisture powder, on an electrode current collector, while the gas phase remains present;
a step of carrying out depression/elevation transfer into a surface part of the formed coating film;
a step of forming an electrode active material layer by drying the coating film into which a depression and an elevation have been transferred; and
a step of pressing the formed electrode active material layer, wherein the electrode active material particles are aspherical particles in which a ratio of a short side to a long side in a cross sectional view is less than 0.95, and
the step of carrying out of the depression/elevation transfer is performed prior to the step of forming of the electrode active material layer and the step of pressing of the formed electrode active material layer.