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Electrode Flexibility Enhances Electrolyte Dynamics during Supercapacitor Charging.

Zacharie Waysenson1, Arthur France-Lanord1, Alessandra Serva2,3

  • 1Sorbonne Université, Muséum National d'Histoire Naturelle, UMR CNRS 7590, Institut de Minéralogie, de Physique des Matériaux et de Cosmochimie, IMPMC, F-75005 Paris, France.

ACS Nano
|August 8, 2025
PubMed
Summary
This summary is machine-generated.

Flexible carbon electrodes significantly improve supercapacitor charging speed by enhancing ion movement and reducing pore crowding. This breakthrough offers faster energy storage without sacrificing capacitance.

Keywords:
constant potentialelectrodeflexiblemachine learningmolecular dynamicssupercapacitors

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Computational Chemistry

Background:

  • Supercapacitors offer high power density and long cycle life, crucial for energy storage.
  • Current models understand nanopore size and disorder effects but neglect electrode flexibility.
  • Rigid electrode approximations limit understanding of supercapacitor charging dynamics.

Purpose of the Study:

  • To investigate the impact of electrode flexibility on supercapacitor performance using advanced simulations.
  • To compare charging mechanisms in rigid versus flexible nanoporous carbon electrodes.
  • To quantify the effect of flexibility on ionic diffusivity and charging time.

Main Methods:

  • Integrated constant-potential molecular dynamics with machine-learning potentials for carbon.
  • Simulated nanoporous sp2/sp3 carbon electrodes with ionic liquid electrolytes.
  • Compared rigidified electrode models with flexible frameworks allowing atomic relaxation.

Main Results:

  • Electrode flexibility significantly enhances in-pore ionic diffusivity, reducing charging time by a factor of 3.
  • Specific capacitance remained within the experimental range (≈140 F·g⁻¹) for both rigid and flexible electrodes.
  • Flexibility was shown to accelerate co-ion expulsion and mitigate pore overcrowding.

Conclusions:

  • Electrode flexibility is a critical factor for optimizing supercapacitor kinetics.
  • Flexible electrodes promote homogeneous charge distribution and deeper charge penetration.
  • This study provides a new avenue for designing high-performance, fast-charging supercapacitors.