Cu-Laminated Resin Current Collector for Low Resistance and Peel Control
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Solution Overview
Problem
Laminated resin films used as current collectors for lithium secondary batteries face issues of high electric resistance, metal layer fracture, and peeling of the metal layer from the resin layer.
Innovation Solution
A Cu film is formed on the surface of a resin layer with specific crystallinity and orientation, characterized by an orientation index of 0.15 or more and a half-width of 0.3° or less in X-ray diffraction measurements, to create a laminated resin film with low electric resistance and improved adhesion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If a metal layer is formed on the surface of a resin layer to create a current collector, then electrical conductivity is improved, but the metal layer is prone to fracture and peeling
Solution Approach 1:
The patent changes the crystalline orientation parameters of the Cu film by controlling deposition conditions. Specifically, it achieves a (111) plane orientation index of 0.15 or more and a half-width of 0.3° or less, which fundamentally alters the physical properties of the metal layer to simultaneously improve conductivity and mechanical integrity
Solution Approach 2:
The patent creates a composite structure with a resin layer and a Cu film layer with specific crystalline orientation. This composite structure combines the electrical conductivity of metal with the mechanical flexibility and adhesion of the resin, while the specific orientation of the Cu film prevents fracture and peeling
2Use of energy by moving object
If a metal layer is formed on the resin layer to reduce electric resistance, then conductivity increases, but the metal layer peels from the resin layer
Solution Approach 1:
The patent changes the crystalline orientation parameters of the Cu film by controlling deposition conditions. Specifically, it achieves a (111) plane orientation index of 0.15 or more and a half-width of 0.3° or less, which fundamentally alters the physical properties of the metal layer to simultaneously improve conductivity and mechanical integrity
Solution Approach 2:
The patent applies different properties to different parts of the metal layer by controlling the crystalline orientation. The (111) plane orientation creates specific local atomic arrangements that enhance both electrical conductivity and interfacial adhesion to the resin layer
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution results in a current collector with low electric resistance, preventing fracture and peeling of the Cu film, leading to a lightweight and safe secondary battery.
Implementation Method 1
in the Cu film, an orientation index of a (111) plane is 0.15 or more according to a Lotgering method, a half-width of an X-ray diffraction peak obtained by X-ray diffraction measurement of the (111) plane is 0.3° or less
Data Source
AI summary
A laminated resin film includes: a resin layer; and a Cu film having on one surface or both surfaces of the resin layer, in which in the Cu film, an orientation index of a plane is 0.15 or more according to a Lotgering method, a half-width of an X-ray diffraction peak obtained by X-ray diffraction measurement of the plane is 0.3° or less, and Expression (1) is satisfied.y>3.75x−0.675 Expression (1)(in Expression (1), Y is the orientation index of the plane in the Cu film according to the Lotgering method, and x is the half-width of the X-ray diffraction peak obtained by the X-ray diffraction measurement of the plane in the Cu film.)