Copper Foil Crystal Orientation for Impact-Resistant Battery Anodes
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Solution Overview
Problem
Existing electrochemical devices, such as lithium-ion batteries, face challenges in meeting the increasing safety performance demands of users due to issues with mechanical stability and impact resistance.
Innovation Solution
Utilizing a copper foil with a (220) crystal face peak area percentage of 15% to 21% as the negative electrode current collector, which enhances the mechanical stability and impact resistance by increasing the elongation and strength of the negative electrode, thereby improving the safety performance of the electrochemical device.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional copper foil is used as the negative electrode current collector, then the manufacturing process is simple, but the impact resistance and safety performance are insufficient
Solution Approach 1:
The patent applies parameter changes by precisely controlling the crystallographic orientation parameters of the copper foil, specifically setting the (220) crystal face peak area percentage to 15-21% and the (111) crystal face peak area percentage to 65-75%. This parameter optimization enhances the copper foil's mechanical properties including elongation (≥8%) and strength (≥400 MPa), thereby improving impact resistance and safety performance without fundamentally changing the manufacturing process
Solution Approach 2:
The patent creates a composite structure by combining copper foil with specific crystal orientation characteristics with the negative electrode active material layer. The specially oriented copper foil substrate provides enhanced mechanical support and deformation resistance, while maintaining electrical conductivity, forming a composite current collector system that improves overall battery safety
2Strength
If the copper foil has high strength, then the mechanical stability is improved, but the elongation may be reduced
Solution Approach 1:
The patent resolves this contradiction by optimizing multiple parameters simultaneously: controlling the crystal orientation ((220) face 15-21%, (111) face 65-75%), grain size (1.7-3.5 μm), strength (≥400 MPa), and elongation (≥8%). The specific crystal orientation distribution creates a balanced microstructure that provides both high strength and adequate elongation, ensuring mechanical stability under various stress conditions
3Adaptability or versatility
If the copper foil undergoes significant deformation during assembly, then the adaptability is improved, but the fracture risk increases
Solution Approach 1:
The patent uses parameter changes to optimize the copper foil's mechanical response: controlling elongation to be ≥8% allows the foil to accommodate assembly deformations and electrode expansion/contraction, while the strength ≥400 MPa and specific crystal orientation prevent fracture. The balanced parameter set enables the copper foil to deform adaptively without breaking
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 with specified (220) crystal face peak area percentage significantly increases the impact pass rate of the electrochemical device, enhancing its safety performance by reducing debris and fracture during mechanical stress.
Implementation Method 1
a (220) crystal face peak area percentage of the copper foil is 15% to 21%
Implementation Method 2
the copper foil is obtained by electrodepositing an electrodeposition solution
Data Source
AI summary
An electrochemical device includes a negative electrode sheet, the negative electrode sheet includes a negative electrode current collector and a negative electrode active material layer, and the negative electrode active material layer is located on the negative electrode current collector. The negative electrode current collector includes a copper foil, and a (220) crystal face peak area percentage of the copper foil is 15% to 21%. Using the copper foil with a (220) crystal face peak area percentage of 15% to 21% as the negative electrode current collector can increase the impact pass rate of the electrochemical device, thereby improving the safety performance of the electrochemical device.