Stretchable Composite Electrode Wrinkle Formation
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Solution Overview
Problem
Conventional carbon nanotube composite electrodes are prone to breaking when repeatedly stretched in multiple directions due to limited mechanical stress resistance, compromising their electrochemical properties and durability.
Innovation Solution
A method involving a pre-stretched elastic substrate with super-aligned carbon nanotube films and active material layers, where the substrate is pre-stretched in multiple directions to form wrinkles that absorb stress, enhancing the electrode's ability to resist stretching in various directions without breaking.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If conventional carbon nanotube composite electrodes are stretched in multiple directions, then the electrode can accommodate stretchable electronic device requirements, but the electrode breaks easily due to limited mechanical stress resistance
Solution Approach 1:
The electrode is segmented into multiple independent carbon nanotube film layers, each aligned in different directions. This segmentation allows each layer to independently bear stress in its alignment direction, preventing catastrophic failure when stretched in multiple directions while maintaining overall structural integrity and reliability
Solution Approach 2:
The electrode uses a composite structure combining multiple carbon nanotube film layers with active material layers. The carbon nanotube films provide mechanical strength and conductivity in specific directions, while the active materials provide electrochemical function. This composite approach enables the electrode to maintain both stretchability in multiple directions and resistance to repeated stretching
2Reliability
If carbon nanotube films are aligned in a single direction for optimal conductivity, then electrical properties are improved, but the electrode cannot withstand stretching in different directions simultaneously
Solution Approach 1:
The electrode is divided into multiple carbon nanotube film layers, each with uniaxial alignment for optimal conductivity in its direction. The segmentation allows each layer to maintain its electrical properties while the collective arrangement provides multi-directional stretchability
Solution Approach 2:
The solution transitions from single-direction alignment to multi-directional alignment by stacking carbon nanotube films with different orientation angles. This dimensional approach allows the electrode to maintain high electrical conductivity in multiple directions simultaneously, achieving both reliability in electrical properties and adaptability in stretchability
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 significantly improves the strain-bearing ability and resistance stability of stretchable composite electrodes, maintaining integrity and capacity retention even after repeated stretching cycles, with minimal increase in resistance and reversible deformation.
Implementation Method 1
the substrate is pre-stretched in multiple directions to form wrinkles that absorb stress, enhancing the electrode's ability to resist stretching in various directions without breaking
Data Source
AI summary
A method of making a stretchable composite electrode is provided. An elastic substrate is pre-stretched along a first direction and a second direction, to obtain a pre-stretched elastic substrate. A carbon nanotube active material composite layer is laid on a surface of the pre-stretched elastic substrate. And the pre-stretching of the elastic substrate is removed, and a plurality of wrinkles is formed on a surface of the carbon nanotube active material composite layer.