US 12,261,303 B2
Lithium ion secondary battery electrode and method for manufacturing the same
Masahiro Ohta, Saitama (JP); and Takuya Taniuchi, Saitama (JP)
Assigned to HONDA MOTOR CO., LTD, Tokyo (JP)
Filed by HONDA MOTOR CO., LTD., Tokyo (JP)
Filed on Nov. 29, 2021, as Appl. No. 17/456,880.
Claims priority of application No. 2020-200013 (JP), filed on Dec. 2, 2020.
Prior Publication US 2022/0173406 A1, Jun. 2, 2022
Int. Cl. H01M 4/76 (2006.01); H01M 4/62 (2006.01); H01M 4/66 (2006.01); H01M 10/0525 (2010.01); H01M 50/533 (2021.01); H01M 4/02 (2006.01)
CPC H01M 4/762 (2013.01) [H01M 4/624 (2013.01); H01M 4/661 (2013.01); H01M 4/667 (2013.01); H01M 10/0525 (2013.01); H01M 50/533 (2021.01); H01M 2004/021 (2013.01)] 6 Claims
OG exemplary drawing
 
1. An electrode used for a lithium ion secondary battery, comprising:
a current collector formed of a metal porous body, the metal porous body comprising a linear metal portion and pores, the pores being formed continuously with each other, the current collector having a mixture layer impregnated with an electrode material mixture containing an electrode active material in the pores of the metal porous body and a non-mixture-impregnated portion not impregnated with the electrode material mixture in the pores of the metal porous body,
wherein a surface roughness Ra of the non-mixture-impregnated portion is equal to or less than a surface roughness of the mixture layer,
the non-mixture-impregnated portion includes a tab portion having a higher metal density than that of the mixture layer and a tab converging portion formed between the mixture layer and the tab portion, and
a surface roughness Ra of the tab converging portion is equal to or less than an average wire diameter of the linear metal portion of the metal porous body.