Electrolytic Copper Foil Orientation Control to Prevent Tears and Wrinkles
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Solution Overview
Problem
Existing copper foils used as anode current collectors in secondary batteries face issues such as tearing, wrinkling, and curling during manufacturing due to reduced thickness, which affects their strength and handling, leading to defects in final products like flexible printed circuit boards and secondary batteries.
Innovation Solution
A copper foil with specific A-value, stress factor values, and Vickers hardness within defined ranges, manufactured using a controlled electrolytic process with precise additives, to enhance strength and prevent defects.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If the thickness of the copper foil is decreased to increase the amount of active material, then the capacity of secondary batteries is improved, but the strength of the copper foil is reduced and the possibility of breaking is increased
Solution Approach 1:
The patent applies parameter changes by controlling the A-value (a measure of crystal orientation) within a specific range of 1.1 to 1.6 through electrolytic copper foil manufacturing parameters. This controlled parameter change achieves high strength properties in ultra-thin copper foil (6 μm or less) while maintaining the required quantity of active material for high-capacity batteries
2Quantity of substance
If the thickness of the copper foil is decreased to increase the amount of active material, then the capacity of secondary batteries is improved, but the handling of the copper foil becomes difficult
Solution Approach 1:
The patent uses parameter changes by controlling the A-value within 1.1 to 1.6 to achieve high strength properties that make ultra-thin copper foil (6 μm or less) easy to handle. The specific crystal orientation control prevents curling and breaking during manufacturing processes, thereby improving ease of operation while maximizing active material content
3Quantity of substance
If the copper foil becomes thinner to increase the amount of active material, then the capacity of secondary batteries is improved, but curling occurs and defects such as tears or wrinkles occur during manufacturing
Solution Approach 1:
The patent applies parameter changes by controlling the A-value within 1.1 to 1.6 to prevent curling and reduce defects such as tears and wrinkles in ultra-thin copper foil (6 μm or less). This controlled crystal orientation ensures high manufacturing precision and quality during the manufacturing process while maximizing active material content
Solution Approach 2:
The patent uses preliminary action by controlling the crystal orientation (A-value) during the electrolytic copper foil manufacturing process before the foil is used in battery assembly. This preliminary control of structural parameters prevents curling and defect formation during subsequent manufacturing steps, thereby improving manufacturing precision
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 copper foil maintains high strength and prevents defects during manufacturing, improving the productivity of intermediate and final products by ensuring stable capacity retention and efficient charge/discharge performance.
Implementation Method 1
a method for manufacturing the same
Implementation Method 2
an electrolytic copper foil is widely used as the anode current collector
Data Source
Figure 1~2
Figure 3~4
Figure 5
AI summary
Provided in one embodiment of the present invention is a copper foil comprising a copper film, which comrpises 99.9 wt% or more of copper, wherein the copper film has an A-value of 1.1-1.6. A is calculated by the following relation 1, [Relation 1] A=P/Q, P in relation 1 is the peak intensity at 1650 cm-1, of the copper film, Q in relation 1 is the peak intensity at 1460 cm-1, of the copper film, and the peak intensities are measured by FT-IR. Provided in one embodiment of the present invention is the copper foil and a manufacturing method therefor, the copper foil comprising a copper film, which comprises 99.9 wt% or more of copper and has a first stress coefficient of 2.8-3.2, a second stress coefficient of 2.5-3.0 and a third stress coefficient of 3.5-4.5. The first stress coefficient is calculated by relation 2, [relation 2] first stress coefficient =A/A'+B/B'+C/C'. The second stress coefficient is calculated by relation 3, [relation 3] second stress coefficient = A/B+A'/B'. The third stress coefficient is calculated by relation 4, [relation 4] third stress coefficient = A/C+A'/C', A in relation 2 is stress at 50% elongation in MD, A' in relation 2 is stress at 50% elongation in TD, B in relation 2 is stress at 10% elongation in MD, B' in relation 2 is stress at 10% elongation in TD, C in relation 2 is stress at 5% elongation in MD, and C' in relation 2 is stress at 5% elongation in TD. In addition, provided in another embodiment of the present invention is an electrode comprising the copper foil, and a secondary battery comprising same.