US 12,230,806 B2
Non-aqueous electrolyte secondary battery
Shinya Suzuki, Kobe (JP); and Akira Tsujiko, Kobe (JP)
Assigned to PRIME PLANET ENERGY & SOLUTIONS, INC., Tokyo (JP)
Filed by Prime Planet Energy & Solutions, Inc., Tokyo (JP)
Filed on Feb. 24, 2022, as Appl. No. 17/679,108.
Claims priority of application No. 2021-027254 (JP), filed on Feb. 24, 2021.
Prior Publication US 2022/0271295 A1, Aug. 25, 2022
Int. Cl. H01M 4/62 (2006.01); H01M 4/36 (2006.01); H01M 4/505 (2010.01); H01M 4/525 (2010.01); H01M 4/02 (2006.01)
CPC H01M 4/625 (2013.01) [H01M 4/366 (2013.01); H01M 4/505 (2013.01); H01M 4/525 (2013.01); H01M 2004/021 (2013.01); H01M 2004/028 (2013.01)] 8 Claims
OG exemplary drawing
 
1. A non-aqueous electrolyte secondary battery comprising:
a positive electrode;
a negative electrode; and
an electrolyte solution, wherein
the positive electrode includes a positive electrode substrate and a positive electrode active material layer,
the positive electrode active material layer is placed on a surface of the positive electrode substrate,
the positive electrode active material layer includes a first layer and a second layer,
the first layer is interposed between the positive electrode substrate and the second layer,
the positive electrode active material layer includes a positive electrode active material, carbon black, and fibrous carbon,
a mass fraction of the carbon black in the first layer is higher than a mass fraction of the carbon black in the second layer,
in the first layer, the mass fraction of the carbon black relative to a mass of the positive electrode active material is from 1.5% to 5%,
a mass fraction of the fibrous carbon in the second layer is higher than a mass fraction of the fibrous carbon in the first layer, and
in the second layer, the mass fraction of the fibrous carbon relative to a mass of the positive electrode active material is from 0.2% to 1%.