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Reversible Heating in Electric Double Layer Capacitors.

Mathijs Janssen1, René van Roij1

  • 1Institute for Theoretical Physics, Center for Extreme Matter and Emergent Phenomena, Utrecht University, Princetonplein 5, 3584 CC Utrecht, The Netherlands.

Physical Review Letters
|March 18, 2017
PubMed
Summary
This summary is machine-generated.

Reversible heating in electric double layer capacitors is clarified. A combined Poisson-Nernst-Planck and heat equation accurately predicts temperature changes during slow charging, unlike other models.

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Area of Science:

  • Electrochemistry
  • Materials Science
  • Thermodynamics

Background:

  • Electric double layer capacitors (EDLCs) are crucial energy storage devices.
  • Understanding thermal effects during charging is vital for EDLC performance and safety.
  • Discrepancies exist in models predicting reversible heating in EDLCs.

Purpose of the Study:

  • To compare different theoretical viewpoints on reversible heating in EDLCs.
  • To validate a combined Poisson-Nernst-Planck and heat equation against thermodynamic predictions.
  • To highlight the unexplored information within the thermal response of supercapacitors.

Main Methods:

  • Detailed comparison of theoretical models for reversible heating in EDLCs.
  • Application of a combined Poisson-Nernst-Planck and heat equation under slow charging conditions.
  • Analysis of the thermal response during adiabatic charging of supercapacitors.

Main Results:

  • The combined Poisson-Nernst-Planck and heat equation recovers temperature changes predicted by Janssen et al.'s thermodynamic identity.
  • This model disagrees with the approximative model proposed by Schiffer et al.
  • The study demonstrates that adiabatic charging thermal response offers insights into electric double layer formation.

Conclusions:

  • The combined Poisson-Nernst-Planck and heat equation provides a more accurate description of reversible heating in EDLCs during slow charging.
  • Existing literature models may inaccurately represent thermal phenomena in supercapacitors.
  • Further exploration of thermal responses during adiabatic charging can reveal deeper insights into EDLC behavior.