Stretchable Ionic Tribolayer for Conductive Wearable TENGs
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Solution Overview
Problem
Existing wearable electronics require stretchable electrode materials with high conductivity and low charge leakage, as conventional metals and carbon are not stretchable, and hydrogel and solid conductors have limitations in conductivity and leakage risks.
Innovation Solution
A surfactant-protected ionic conductive material made from a stretchable polymer with added surfactant and ionic salt, such as WPU with sodium laureth sulfate and 1-methylimidazole chloride, is used as both the positive tribolayer and electrode, enhancing conductivity and preventing separation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional metals and carbon are used as electrode materials, then excellent conductive properties are achieved, but stretchability is lost
Solution Approach 1:
The patent changes the fundamental parameters of the electrode material by transitioning from conventional metals and carbon to ionic conductors. This involves selecting polymers with appropriate glass transition temperatures and mechanical properties, adjusting ionic salt concentrations, and controlling water content to achieve both high conductivity (≥10⁻³ S/m) and exceptional stretchability (≥500% elongation).
Solution Approach 2:
The patent creates composite electrode materials by combining polymers, ionic salts, and water in specific ratios. The composite structure integrates the flexibility and stretchability of polymers with the ionic conductivity of salt solutions, achieving a synergistic effect where the material exhibits both mechanical compliance and electrical functionality suitable for wearable devices.
2Adaptability or versatility
If hydrogel conductors are used, then stretchability is improved, but gel leaks and charge leakage risks increase
Solution Approach 1:
The patent applies local quality control by optimizing the water content and ionic salt distribution within the polymer matrix. By controlling the local concentration of ionic species and the crosslinking density in specific regions, the material achieves uniform ionic conductivity while maintaining structural integrity and preventing charge leakage pathways.
Solution Approach 2:
Instead of using hydrogel structures that inherently leak, the patent inverts the approach by using solid polymer matrices with embedded ionic conductors. This inversion eliminates the liquid-like behavior that causes gel leakage while maintaining ionic conductivity through the solid polymer-ionic salt-water composite structure.
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 material achieves high conductivity (5×10−3 mS/cm) and electric output (300 V open circuit voltage, 30 μA short circuit current) with excellent stretchability (550% elongation at break), suitable for wearable devices.
Implementation Method 1
a stretchable polymer to which a surfactant and ionic salt are added
Implementation Method 2
ionic salt are added, is used as both the positive tribolayer and electrode, enhancing conductivity
Implementation Method 3
a surfactant-protected ionic conductive material made from a stretchable polymer with added surfactant and ionic salt
Implementation Method 4
Triboelectric nanogenerators are particularly useful for harvesting kinetic energy from motions
Implementation Method 5
When the two tribolayers separate, opposite charges are induced on attached electrodes, wherein a potential is formed
Data Source
AI summary
There is provided a triboelectric nanogenerator which includes a negative electrode, a negative tribolayer, a positive tribolayer, and a positive electrode. The positive tribolayer and the positive electrode are made of the same material. The material is a surfactant-protected ionic conductive material.