Patent ID: 10763514

Abstract:
The invention relates to an electrically conductive base material (112) for receiving a coating material (114) which comprises electrically conductive particles (116), a method for the production thereof and the use thereof as current collector for an electrode material comprising electrically conductive particles. The base material (112) comprises a metal foil, wherein at least one surface (118) of the base material (112) provided for receiving the electrically conductive particles (116) has a first structure (120) and a second structure (122), wherein the first structure (120) has first ridges (124) and/or first grooves (126) relative to the surface (118) of the base material (112) and wherein the second structure (122) has second ridges (128) and/or second grooves (130) relative to the surface (132) of the first structure (120). Herein, the first ridges (124) and/or the first grooves (126) have first dimensions, wherein the second ridges (128) and/or the second grooves (130) have second dimensions, wherein the first dimensions exceed the second dimensions by a factor of at least 10.The invention further relates to an electrically conductive layer composite (110) which comprises the base material (112) and a coating material (114) comprising electrically conductive particles (116), a method for the production thereof and the use thereof in a secondary element of a rechargeable battery, in particular in a lithium ion battery. Herein, the particles (116) in the coating material (114) adhere to first ridges (124) and/or to first grooves (126) in a first structure (120) on the surface (118) of the base material (112) and/or to second ridges (128) and/or to second grooves (130) in a second structure (122) on the surface (132) of the first structure (120). A good bonding of the coating material (114) to the base material (112) reduces or prevents a layer delamination of the coating material (114) from the base material (112).