US 12,142,764 B2
Positive electrode mixture layer, conductive additive, positive electrode mixture, and lithium-ion secondary battery
Daisuke Harada, Tokyo (JP); Hirofumi Inoue, Tokyo (JP); Daisuke Kohno, Tokyo (JP); and Akihisa Tonegawa, Tokyo (JP)
Assigned to Resonac Corporation, Tokyo (JP)
Filed by Resonac Corporation, Tokyo (JP)
Filed on Dec. 8, 2023, as Appl. No. 18/534,281.
Application 18/534,281 is a continuation of application No. PCT/JP2022/043115, filed on Nov. 22, 2022.
Claims priority of application No. 2021-189675 (JP), filed on Nov. 22, 2021.
Prior Publication US 2024/0120481 A1, Apr. 11, 2024
Int. Cl. H01M 4/58 (2010.01); H01M 4/62 (2006.01); H01M 10/0525 (2010.01); H01M 4/02 (2006.01)
CPC H01M 4/5825 (2013.01) [H01M 4/625 (2013.01); H01M 10/0525 (2013.01); H01M 2004/021 (2013.01); H01M 2004/028 (2013.01)] 15 Claims
 
1. A positive electrode mixture layer for a lithium-ion secondary battery, the layer comprising:
a positive electrode active material, a binder, and a conductive additive,
wherein the conductive additive comprises carbon black, a carbon nanotube 1 having an average fiber diameter of 80 to 400 nm, and a carbon nanotube 2 having an average fiber diameter of 0.4 to 3.0 nm and an average fiber length of 10 μm or longer,
the content rates of the carbon black, the carbon nanotube 1, and the carbon nanotube 2 in the conductive additive are 40 to 80% by mass, 10 to 50% by mass, and 1 to 30% by mass, respectively, and
the content rate of the conductive additive in the positive electrode mixture layer is 0.1 to 5.0% by mass.