Semi-Interpenetrating Polymer Networks for Enhanced Supercapacitor Electrodes
Kara D Fong1, Tiesheng Wang1, Hyun-Kyung Kim1
1Department of Materials Science and Metallurgy, University of Cambridge, 27 Charles Babbage Road, Cambridge CB3 0FS, United Kingdom.
ACS Energy Letters
|November 7, 2017
Summary
Researchers developed flexible supercapacitors using semi-interpenetrating networks (sIPNs) of conducting polymers. This innovation enhances specific capacitance and cycling stability for advanced energy storage devices.
Area of Science:
- Materials Science
- Electrochemistry
- Polymer Science
Background:
- Conducting polymers offer high theoretical capacitance for supercapacitors but suffer from poor ion mobility, limiting performance.
- Limited ion diffusion in conducting polymers restricts charge storage to near-surface regions, hindering overall device efficiency.
Purpose of the Study:
- To enhance supercapacitor performance by improving ion mobility and material accessibility in conducting polymers.
- To develop a novel material architecture for high-performance, flexible energy storage devices.
Main Methods:
- Fabrication of freestanding semi-interpenetrating networks (sIPNs) using poly(3,4-ethylenedioxythiophene) (PEDOT) and poly(ethylene oxide) (PEO).
- Characterization of the sIPN films for specific capacitance, cycling stability, and mechanical flexibility.
Main Results:
- Achieved a specific capacitance of 182 F/g, a 70% increase compared to neat PEDOT.
- Demonstrated excellent cycling stability with 97.5% capacitance retention after 3000 cycles.
- Developed highly flexible electrodes capable of bending to a radius of <200 μm without fracture.
Conclusions:
- Semi-interpenetrating networks (sIPNs) effectively reduce ion diffusion lengths, enabling greater utilization of active material for supercapacitors.
- The PEDOT/PEO sIPN films offer a promising pathway for creating high-performance, durable, and flexible polymer-based energy storage solutions.
- The developed sIPN fabrication process provides a versatile framework for designing advanced polymer materials for energy storage applications.
