Electrolytic Copper Foil Crystal Orientation for High Elongation
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Solution Overview
Problem
Conventional electrolytic copper foils with high elongation require high concentrations of additives, leading to increased production costs and unstable process conditions.
Innovation Solution
A method for producing electrolytic copper foil with a copper electrolytic solution containing a concentration of addition agents not exceeding 12 ppm, resulting in a ratio of diffraction peak intensities I(200)/I(111) between 0.5 and 2.0, which enhances elongation and production stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a high concentration of additive is used in the electrolytic solution, then the elongation of the copper foil is improved, but the production cost increases and process conditions become difficult to control
Solution Approach 1:
The patent changes the concentration parameter of additives in the electrolytic solution from high (conventional) to low (≤12 ppm), and simultaneously changes the crystal orientation parameter (I(200)/I(111) ratio) to achieve high elongation. This parameter transformation resolves the contradiction by finding a new operating point that achieves the desired mechanical property without the drawbacks of high additive concentration.
Solution Approach 2:
The patent replaces the chemical mechanism (high additive concentration affecting crystal growth) with an electrochemical mechanism (controlled electrolysis parameters producing specific crystal orientations). By substituting the dominant mechanism from purely chemical to electrochemical, the process achieves high elongation through controlled crystal orientation rather than additive concentration, improving both control and reducing costs.
2Strength
If a high concentration of additive is used in the electrolytic solution, then the elongation of the copper foil is improved, but the production cost increases
Solution Approach 1:
The patent transforms the additive concentration parameter from high to low (≤12 ppm) while simultaneously optimizing the crystal orientation parameter (I(200)/I(111) ratio between 0.5-2.0). This dual parameter change achieves high elongation through crystal structure control rather than additive quantity, resolving the contradiction between mechanical property improvement and material consumption reduction.
Solution Approach 2:
The patent creates a new production pathway that copies the desired outcome (high elongation) through a different mechanism (crystal orientation control via electrolysis parameters) rather than following the conventional path (high additive concentration). This alternative copying method achieves the same mechanical property improvement without the associated cost increase.
3Strength
If a high concentration of additive is used in the electrolytic solution, then the elongation of the copper foil is improved, but the process conditions cannot be easily controlled
Solution Approach 1:
The patent changes the controlling parameters from additive concentration (hard to control at high levels) to electrolysis parameters and crystal orientation ratios (easier to control and measure). By shifting the control focus to electrical parameters and measurable crystal structure characteristics, the process achieves both high elongation and improved stability.
Solution Approach 2:
The patent introduces feedback control through measurement of the I(200)/I(111) diffraction ratio, which directly reflects crystal orientation. By using this measurable parameter as a feedback indicator, the process can be monitored and adjusted to maintain high elongation properties, thereby improving process stability and reliability.
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 method achieves high elongation and low production costs while maintaining production stability by optimizing the crystal orientations and reducing additive usage, leading to improved tensile strength and elongation performance.
Implementation Method 1
performing an electroplating step including: electrolyzing the copper electrolytic solution to form a raw foil layer
Implementation Method 2
electrolyzing the copper electrolytic solution to form a raw foil layer
Data Source
AI summary
A method for producing an electrolytic copper foil is provided. The method includes preparing a copper electrolytic solution including at least one addition agent and performing an electroplating step including: electrolyzing the copper electrolytic solution to form a raw foil layer. The raw foil layer has a first surface and a second surface opposite to the first surface. In the X-ray diffraction spectrum of the first surface, a ratio of the diffraction peak intensity I(200) of the (200) crystal face of the first surface relative to the diffraction peak intensity I(111) of the (111) crystal face of the first surface is between 0.5 and 2.0. A ratio of the diffraction peak intensity I(200) of the (200) crystal face of the second surface relative to the diffraction peak intensity I(111) of the (111) crystal face of the second surface is between 0.5 and 2.0.