US 10,763,514 B2 · Electrically conductive base material and layer composite, method for producing the same, and use of the same

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).

Claims11

Dependent claims

An electrically conductive base material for receiving a coating material which comprises electrically conductive particles, wherein the base material comprises a metal foil,

wherein at least one surface of the base material provided for receiving the electrically conductive particles has a first structure and a second structure,
wherein the first structure has at least one of first ridges or first grooves relative to the surface of the base material, wherein the second structure has at least one of second ridges or second grooves relative to the surface of the first structure,
wherein at least one of the first ridges or the first grooves have first dimensions, wherein at least one of the second ridges or the second grooves have second dimensions, wherein the first dimensions exceed the second dimensions by a factor of at least 10,
wherein the surface of the unstructured base material additionally has a separate layer of a further electrically conductive material,
wherein the surface of the base material is exposed at least part of the first grooves, and at least one of the second ridges or the second grooves are introduced into the surface of the base material, producing a chemical pattern topography on the surface of the base material providing for multiscale mechanical anchoring and chemical anchoring of the coating material.

2 more elements

Dependencies are inferred from the claim text.

Electrically conductive base material and layer composite, method for producing the same, and use of the same

Life of this patent

Electrically conductive base material and layer composite, method for producing the same, and use of the same

Life of this patent

Abstract

Claims11