US 12,394,777 B2
Composite electrode for a lithium or lithium-ion battery and production method therefor
Sung-Jin Kim, Munich (DE); Hideki Ogihara, Haimhausen (DE); Nikolaos Tsiouvaras, Munich (DE); and Thomas Woehrle, Munich (DE)
Assigned to Bayerische Motoren Werke Aktiengesellschaft, Munich (DE)
Appl. No. 17/636,622
Filed by Bayerische Motoren Werke Aktiengesellschaft, Munich (DE)
PCT Filed Jul. 17, 2020, PCT No. PCT/EP2020/070343
§ 371(c)(1), (2) Date Feb. 18, 2022,
PCT Pub. No. WO2021/032380, PCT Pub. Date Feb. 25, 2021.
Claims priority of application No. 10 2019 122 226.5 (DE), filed on Aug. 19, 2019.
Prior Publication US 2022/0285661 A1, Sep. 8, 2022
Int. Cl. H01M 4/04 (2006.01); H01M 4/02 (2006.01); H01M 4/36 (2006.01); H01M 4/525 (2010.01); H01M 4/587 (2010.01); H01M 4/62 (2006.01); H01M 4/66 (2006.01); H01M 10/0525 (2010.01)
CPC H01M 4/043 (2013.01) [H01M 4/0404 (2013.01); H01M 4/366 (2013.01); H01M 4/525 (2013.01); H01M 4/587 (2013.01); H01M 4/623 (2013.01); H01M 4/625 (2013.01); H01M 4/661 (2013.01); H01M 10/0525 (2013.01); H01M 2004/021 (2013.01); H01M 2004/027 (2013.01)] 13 Claims
OG exemplary drawing
 
1. A method for producing a composite electrode for a lithium or lithium-ion battery, comprising:
providing a foil-like or planar current collector having a main face;
forming a first electrode layer on the main face of the current collector, wherein the first electrode layer comprises a first active material and a first binder and forms a first adherence between the current collector and the first electrode layer along the main face;
forming a second electrode layer on the first electrode layer, wherein the first and second electrode layer are mutually touching along a contact face which lies opposite the main face of the current collector, and the second electrode layer comprises a second active material and a second binder and has an adherent connection to the first electrode layer along the contact face; and
compressing the first and second electrode layer using a compression device, wherein, during the compression, a pressure element of the compression device exerts a pressure on at least a portion of the face of the second electrode layer that lies opposite the contact face, a face of the pressure element having a roughness comprising a mean roughness depth, Rz, of less than 2 μm, and a second adherence forms between the pressure element and the portion of the face of the second electrode layer on which the pressure is exerted, and
wherein a ratio between the first adherence and the second adherence which arises as a result of the compression is greater than one.