Flexible Battery Electrospinning Current Collector Binding
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Solution Overview
Problem
Conventional flexible batteries face challenges in maintaining binding strength between the current collector and electrode tab, leading to resistance issues and degradation when bent, especially with three-dimensional current collectors.
Innovation Solution
A method involving electrospinning of an electrode active material layer on a current collector with through-holes, allowing for easy tab design and improved binding strength by forming the layer after masking the tab connecting portion, reducing resistance and enhancing flexibility.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a three-dimensional current collector is used to ensure flexibility, then flexibility is improved, but the binding between the current collector and electrode tab breaks easily during continuous bending
Solution Approach 1:
The patent applies different properties to different parts of the current collector: the main body uses a three-dimensional porous structure for flexibility, while the tab connection region uses a dense, flat structure for strong binding. This local differentiation resolves the contradiction between flexibility and binding strength.
Solution Approach 2:
The current collector is segmented into functionally distinct regions: a flexible three-dimensional porous body for ion transport and a dense flat tab connection region for reliable electrical connection. This segmentation allows each region to optimize its specific function without compromising the other.
2Adaptability or versatility
If a three-dimensional current collector is used, then flexibility is improved, but resistance is generated easily at the connection point
Solution Approach 1:
The patent creates a local dense region at the tab connection point that provides low electrical resistance, while the rest of the current collector maintains a porous three-dimensional structure for flexibility. This local quality differentiation eliminates resistance at the connection point while preserving overall flexibility.
3Ease of manufacture
If electrode active material is applied to a foil-type current collector, then manufacturing is simplified, but the binding force is weak and active material separates upon bending
Solution Approach 1:
The patent applies electrode active material to different regions with different properties: the dense flat tab connection region provides strong binding for reliable electrical connection, while the porous three-dimensional regions provide flexibility and ion transport. This resolves the contradiction between manufacturing simplicity and binding strength.
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 effectively increases the binding strength between the current collector and electrode tab, reducing resistance and improving capacity retention in flexible batteries during repeated cycles.
Implementation Method 1
carrying out electrospinning of electrode slurry including an electrode active material, a binder, a conductive material and a solvent on at least one surface of an edge of the current collecting portion and over the through-hole
Data Source
AI summary
A method for manufacturing a flexible battery includes the steps of: preparing an electrode current collector having a current collecting portion provided with at least one through-hole; carrying out electrospinning of electrode slurry including an electrode active material, a binder, a conductive material and a solvent on at least one surface of an edge of the current collecting portion and over the through-hole to form an electrode active material layer on at least one surface of the electrode current collector; and forming a battery provided with the electrode current collector having the electrode active material layer formed thereon as an electrode. A flexible battery obtained from the method is also provided.