Stretchable Composite Electrode via Wrinkled CNT Films
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Solution Overview
Problem
Conventional carbon nanotube composite electrodes are not adequately stretchable in multiple directions and can break easily when repeatedly stretched, lacking the necessary mechanical and electrochemical stability for use in stretchable electronic devices.
Innovation Solution
A method involving the pre-stretching of an elastic substrate in multiple directions, followed by the deposition of super-aligned carbon nanotube films and active material layers to form a composite electrode structure with wrinkles that absorb stress and maintain integrity under strain, enhancing the electrode's ability to resist stretching in various directions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If conventional carbon nanotube composite electrodes are stretched in a single direction, then they can be stretched under little stress, but they are easily broken when repeatedly stretched in different directions
Solution Approach 1:
The electrode is divided into multiple independent carbon nanotube film layers, each layer can independently deform and absorb stress. The layered structure allows each segment to handle stretching in different directions, preventing catastrophic failure when repeatedly stretched in multiple directions.
Solution Approach 2:
The electrode uses a composite structure combining multiple carbon nanotube film layers with different orientations. This composite material approach allows the electrode to leverage the mechanical properties of each layer, achieving both stretchability and reliability when subjected to repeated stretching in different directions.
2Reliability
If carbon nanotube films are used as conductors with active materials, then excellent electrical properties are obtained, but stretchability in multiple directions is limited
Solution Approach 1:
The electrode structure transitions from a single-plane configuration to a multi-layered three-dimensional structure. By stacking carbon nanotube films at different orientations and incorporating active material layers, the electrode gains the ability to stretch in multiple directions while preserving electrical conductivity through the vertical stacking arrangement.
Solution Approach 2:
The electrode combines carbon nanotube films with active materials in a composite structure where carbon nanotubes provide conductivity and mechanical flexibility, while active materials provide electrochemical functionality. The multi-layered composite architecture enables both excellent electrical properties and multi-directional stretchability.
3Stability of the object's composition
If conventional composite electrodes are stretched repeatedly, then they lose structural integrity, but maintaining structural integrity reduces stretchability
Solution Approach 1:
The electrode employs a dynamic structure where carbon nanotube films can reversibly deform during stretching and return to their original configuration. The layered structure allows each layer to dynamically adjust to stress, maintaining overall structural integrity while enabling repeated stretching cycles without permanent deformation or failure.
Data Source
AI summary
A stretchable composite electrode comprising a carbon nanotube active material composite layer is provided. The stretchable composite electrode comprises a plurality of carbon nanotube film structures and a plurality of active material layers. Each of the plurality of active material layers is located between adjacent carbon nanotube film structures. Each of the plurality of carbon nanotube film structures comprises a plurality of super-aligned carbon nanotube films stacked with each other. A surface of the carbon nanotube active material composite layer comprises a plurality of wrinkles. A stretchable composite electrode using the stretchable composite electrode is also provided.