US 12,080,870 B2
Method of producing electrode for secondary battery
Naohiro Mashimo, Toyota (JP); Katsushi Enokihara, Toyota (JP); Haruka Shionoya, Toyota (JP); and Masanori Kitayoshi, Toyota (JP)
Assigned to PRIME PLANET ENERGY & SOLUTIONS, INC., Tokyo (JP)
Filed by Prime Planet Energy & Solutions, Inc., Tokyo (JP)
Filed on Mar. 11, 2022, as Appl. No. 17/692,191.
Claims priority of application No. 2021-040443 (JP), filed on Mar. 12, 2021.
Prior Publication US 2022/0293905 A1, Sep. 15, 2022
This patent is subject to a terminal disclaimer.
Int. Cl. H01M 4/04 (2006.01); H01M 4/02 (2006.01)
CPC H01M 4/0435 (2013.01) [H01M 4/0404 (2013.01); H01M 2004/021 (2013.01)] 4 Claims
OG exemplary drawing
 
1. A method of producing an electrode for a secondary battery having any electrode current collector of positive and negative electrodes and an electrode active material layer, the method comprising:
a step in which a moisture powder formed of agglomerated particles containing at least an electrode active material, a binder resin, and a solvent is prepared,
with a solid phase, a liquid phase, and a gas phase in at least 50 number % or more of the agglomerated particles forming a pendular state or a funicular state in the moisture powder;
a step in which by using the moisture powder, a coating film composed of the moisture powder is formed on the electrode current collector, with a gas phase of the coating film being remained, and
with an average film thickness t1 (μm) of the coating film being 50 μm or more;
a step in which the coating film on the electrode current collector is transported, concavo-convex transfer is performed using a roll mold, and thus at least one groove extending in a transport direction is formed in a center of a surface part of the coating film,
with the groove being formed to have a depth t2 (μm) satisfying ( 9/10×t1)>t2; and
a step in which the coating film formed on the electrode current collector is dried to form an electrode active material layer.