Current Collector Surface Roughness for Battery Adhesion
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Solution Overview
Problem
Lithium secondary batteries face issues with reduced charge and discharge capacities and lifespan due to separation of electrode active material components and the current collector, leading to inadequate adhesion and stress distribution during charging and discharging processes.
Innovation Solution
Surface-treating the current collector using chemical or electrical etching to create a morphology with a surface roughness of 0.001 μm to 10 μm, increasing the surface area and enhancing adhesion between the electrode active material and the current collector, thereby improving battery performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a large amount of binder is used to enhance adhesion between electrode active material and current collector, then adhesion is improved, but conductivity of electrode is reduced and battery capacity is reduced
Solution Approach 1:
The current collector surface is pre-treated with etching solution before coating the electrode slurry. This preliminary surface treatment creates a roughened surface morphology that enhances mechanical interlocking and chemical adhesion between the current collector and electrode active material, reducing the need for excessive binder while maintaining strong adhesion.
Solution Approach 2:
The surface roughness of the current collector is controlled within a specific range (Ra: 0.03 μm to 10 μm) through etching treatment. This parameter optimization ensures sufficient adhesion strength while preventing excessive binder consumption that would harm conductivity and battery capacity.
2Strength
If surface roughness is increased to enhance adhesion, then adhesion between electrode active material and current collector is improved, but manufacturing complexity increases
Solution Approach 1:
The etching process parameters (etching solution composition, etching time, temperature) are optimized to achieve the desired surface roughness range (Ra: 0.03 μm to 10 μm). This parameter control ensures sufficient adhesion enhancement while keeping the manufacturing process simple and economically viable.
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 enhanced adhesion and surface area of the current collector improve the charging and discharging cycle characteristics and overall performance of secondary batteries by maintaining better contact between active materials and the collector, reducing stress distribution issues.
Implementation Method 1
surface-treating is performed by chemical or electrical etching using a wet method or by reactive gas or ion etching using a dry method
Implementation Method 2
surface-treating the current collector so as to have a morphology wherein a surface roughness Ra of 0.001 μm to 10 μm is formed over the entire surface thereof
Data Source
AI summary
Disclosed are a method of manufacturing an electrode for secondary batteries that includes surface-treating a current collector so as to have a morphology wherein a surface roughness Ra of 0.001 μm to 10 μm is formed over the entire surface thereof, wherein the surface-treating is performed by chemical or electrical etching using a wet method or by reactive gas or ion etching using a dry method to enhance adhesion between an electrode active material and the current collector and an electrode for secondary batteries that is manufactured using the method.