Heat generation in electric double layer capacitors with neat and diluted ionic liquid electrolytes under large potential window between 5 and 80 °C
Abstract
Here, this study investigates the effect of temperature on the heat generation and the associated electrochemical phenomena occurring in IL-based EDLCs. The EDLCs consisted of two identical activated carbon electrodes with neat Pyr14TFSI or Pyr14TFSI diluted in propylene carbonate (PC) as electrolytes. The instantaneous heat generation rate at each electrode was measured by isothermal calorimetry between 5 and 80 °C under constant current cycling and potential window of 2.5 V. First, the instantaneous heat generation rate was similar at each electrode in neat IL. However, it was smaller at the negative electrode in diluted IL and featured endothermic dips growing with increasing temperature > 40 °C due to overscreening effects, ion desolvation, and/or decomposition of PC. The irreversible heat generation was similar in each half-cell and decreased with increasing temperature due to the reduction in internal resistance, particularly with neat IL. The irreversible heat generation exceeded Joule heating in all cases, especially at high temperature and low current. This was attributed to ion desorption and charge redistribution in the porous electrodes. Finally, the reversible heat generation for both electrolytes was larger at the positive than at the negative electrode due to the difference in anion and cation sizes.
- Authors:
-
- Univ. of California, Los Angeles, CA (United States)
- Univ. of California, Los Angeles, CA (United States); King Fahd University of Petroleum and Minerals, Dhahran (Saudi Arabia)
- Publication Date:
- Research Org.:
- Univ. of California, Los Angeles, CA (United States)
- Sponsoring Org.:
- USDOE Office of Science (SC), Basic Energy Sciences (BES)
- OSTI Identifier:
- 1853153
- Alternate Identifier(s):
- OSTI ID: 2325424
- Grant/Contract Number:
- SC0019381
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Journal of Power Sources
- Additional Journal Information:
- Journal Volume: 488; Journal Issue: C; Journal ID: ISSN 0378-7753
- Publisher:
- Elsevier
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY; 25 ENERGY STORAGE; 36 MATERIALS SCIENCE; activated carbon; electrolyte degradation; ionic liquid; heat generation; thermal management; thermal runaway
Citation Formats
Likitchatchawankun, Ampol, DeBlock, Ryan H., Whang, Grace, Munteshari, Obaidallah, Frajnkovič, Matevž, Dunn, Bruce S., and Pilon, Laurent. Heat generation in electric double layer capacitors with neat and diluted ionic liquid electrolytes under large potential window between 5 and 80 °C. United States: N. p., 2021.
Web. doi:10.1016/j.jpowsour.2020.229368.
Likitchatchawankun, Ampol, DeBlock, Ryan H., Whang, Grace, Munteshari, Obaidallah, Frajnkovič, Matevž, Dunn, Bruce S., & Pilon, Laurent. Heat generation in electric double layer capacitors with neat and diluted ionic liquid electrolytes under large potential window between 5 and 80 °C. United States. https://doi.org/10.1016/j.jpowsour.2020.229368
Likitchatchawankun, Ampol, DeBlock, Ryan H., Whang, Grace, Munteshari, Obaidallah, Frajnkovič, Matevž, Dunn, Bruce S., and Pilon, Laurent. Thu .
"Heat generation in electric double layer capacitors with neat and diluted ionic liquid electrolytes under large potential window between 5 and 80 °C". United States. https://doi.org/10.1016/j.jpowsour.2020.229368. https://www.osti.gov/servlets/purl/1853153.
@article{osti_1853153,
title = {Heat generation in electric double layer capacitors with neat and diluted ionic liquid electrolytes under large potential window between 5 and 80 °C},
author = {Likitchatchawankun, Ampol and DeBlock, Ryan H. and Whang, Grace and Munteshari, Obaidallah and Frajnkovič, Matevž and Dunn, Bruce S. and Pilon, Laurent},
abstractNote = {Here, this study investigates the effect of temperature on the heat generation and the associated electrochemical phenomena occurring in IL-based EDLCs. The EDLCs consisted of two identical activated carbon electrodes with neat Pyr14TFSI or Pyr14TFSI diluted in propylene carbonate (PC) as electrolytes. The instantaneous heat generation rate at each electrode was measured by isothermal calorimetry between 5 and 80 °C under constant current cycling and potential window of 2.5 V. First, the instantaneous heat generation rate was similar at each electrode in neat IL. However, it was smaller at the negative electrode in diluted IL and featured endothermic dips growing with increasing temperature > 40 °C due to overscreening effects, ion desolvation, and/or decomposition of PC. The irreversible heat generation was similar in each half-cell and decreased with increasing temperature due to the reduction in internal resistance, particularly with neat IL. The irreversible heat generation exceeded Joule heating in all cases, especially at high temperature and low current. This was attributed to ion desorption and charge redistribution in the porous electrodes. Finally, the reversible heat generation for both electrolytes was larger at the positive than at the negative electrode due to the difference in anion and cation sizes.},
doi = {10.1016/j.jpowsour.2020.229368},
journal = {Journal of Power Sources},
number = C,
volume = 488,
place = {United States},
year = {Thu Jan 07 00:00:00 EST 2021},
month = {Thu Jan 07 00:00:00 EST 2021}
}
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