Self-Healable Polyelectrolytes with Mechanical Enhancement for Flexible and Durable Supercapacitors

Area of Science:

• Materials Science
• Electrochemistry
• Polymer Science

Background:

• Advanced personalized electronics require flexible, durable, and self-healable energy storage solutions.
• Current supercapacitors face limitations in mechanical robustness and self-healing capabilities.

Purpose of the Study:

• To develop highly transparent, stretchable, and self-healable polyelectrolytes for improved supercapacitor performance.
• To investigate the mechanical, electrical, and self-healing properties of novel polyelectrolyte materials.

Main Methods:

• Facile one-step radical polymerization to prepare poly(2-acrylamido-2-methyl-1-propanesulfonic acid) (PAMPSA)/poly(vinyl alcohol) (PVA)/LiCl polyelectrolytes.
• Assembly of polyelectrolytes with polypyrrole-coated single-walled carbon nanotubes to create supercapacitors.
• Characterization of electrochemical properties, mechanical performance, and self-healing efficiency.

Main Results:

• The PAMPSA/PVA/LiCl polyelectrolyte exhibited superior stretchability (938%), stress (112.68 kPa), ionic conductivity (20.6 mS cm⁻¹), and self-healing efficiency (92.68%).
• The resulting supercapacitor demonstrated high areal capacitance (297 mF cm⁻² at 0.5 mA cm⁻²) and good rate capability (218 mF cm⁻² at 5 mA cm⁻²).
• The supercapacitor recovered 99.2% of its original capacitance after healing, with negligible changes in contact resistance over ten cutting/healing cycles.

Conclusions:

• The developed polyelectrolytes offer a promising solution for creating durable and high-performance energy storage devices.
• This work addresses the limitations of current supercapacitors, enabling the development of smart, self-healing electronics.