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Title: In Operando Calorimetric Measurements for Activated Carbon Electrodes in Ionic Liquid Electrolytes under Large Potential Windows

Abstract

This study aims to investigate the effect of the potential window on heat generation in carbon-based electrical double layer capacitors (EDLCs) with ionic-liquid (IL)-based electrolytes using in operando calorimetry. The EDLCs consisted of two identical activated-carbon electrodes with either neat 1-butyl-1-methylpyrrolidinium bis(trifluoromethane-sulfonyl)imide ([Pyr14][TFSI]) electrolyte or 1.0 m [Pyr14][TFSI] in propylene carbonate (PC) as electrolyte. The instantaneous heat generation rate at each electrode was measured under galvanostatic cycling for different potential windows ranging from 1 to 4 V. First, the heat generation rates at the positive and negative electrodes differed significantly in neat IL owing to the differences in the ion sizes and diffusion coefficients. However, these differences were minimized when the IL was diluted in PC. Second, for EDLC in neat [Pyr14][TFSI] at high potential window (4 V), a pronounced endothermic peak was observed at the beginning of the charging step at the positive electrode owing to TFSI- intercalation in the activated carbon. On the other hand, for EDLC in 1.0 m [Pyr14][TFSI] in PC at potential window above 3 V, an endothermic peak was observed only at the negative electrode owing to the decomposition of PC. Third, for both neat and diluted [Pyr14][TFSI] electrolytes, the irreversible heat generation ratemore » increased with increasing potential window and exceeded Joule heating. This was attributed to the effect of potential-dependent charge redistribution resistance. Additionally, a further increase in the irreversible heat generation rate was observed for the largest potential windows owing to the degradation of the PC solvent. Finally, for both types of electrolyte, the reversible heat generation rate increased with increasing potential window because of the increase in the amount of ion adsorbed/desorbed at the electrode/electrolyte interface.« less

Authors:
ORCiD logo [1]; ORCiD logo [2]; ORCiD logo [3];  [3];  [3];  [3];  [3]; ORCiD logo [4]; ORCiD logo [4]; ORCiD logo [4]
  1. Univ. of California, Los Angeles, CA (United States); King Fahd Univ. of Petroleum and Minerals (KFUPM), Dhahran (Saudi Arabia)
  2. Ariel Univ. (Israel); Univ. of California, Los Angeles, CA (United States)
  3. Univ. of California, Los Angeles, CA (United States)
  4. Univ. of California, Los Angeles, CA (United States); Univ. of California, Los Angeles, CA (United States). California NanoSystems Inst.
Publication Date:
Research Org.:
Energy Frontier Research Centers (EFRC) (United States). Synthetic Control Across Length-scales for Advancing Rechargeables (SCALAR); Univ. of California, Los Angeles, CA (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES)
OSTI Identifier:
1767534
Grant/Contract Number:  
SC0019381
Resource Type:
Accepted Manuscript
Journal Name:
ChemSusChem
Additional Journal Information:
Journal Volume: 13; Journal Issue: 5; Journal ID: ISSN 1864-5631
Publisher:
ChemPubSoc Europe
Country of Publication:
United States
Language:
English
Subject:
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY; electrocatalysis; electrical energy storage; defects; charge transport; mesoscale science; materials and chemistry by design; mesostructured materials; synthesis (novel materials); synthesis (scalable processing); activated carbon; electrolyte degradation; ionic liquids; thermal management; thermal runaway

Citation Formats

Munteshari, Obaidallah, Borenstein, Arie, DeBlock, Ryan H., Lau, Jonathan, Whang, Grace, Zhou, Yucheng, Likitchatchawankun, Ampol, Kaner, Richard B., Dunn, Bruce, and Pilon, Laurent. In Operando Calorimetric Measurements for Activated Carbon Electrodes in Ionic Liquid Electrolytes under Large Potential Windows. United States: N. p., 2020. Web. doi:10.1002/cssc.201903011.
Munteshari, Obaidallah, Borenstein, Arie, DeBlock, Ryan H., Lau, Jonathan, Whang, Grace, Zhou, Yucheng, Likitchatchawankun, Ampol, Kaner, Richard B., Dunn, Bruce, & Pilon, Laurent. In Operando Calorimetric Measurements for Activated Carbon Electrodes in Ionic Liquid Electrolytes under Large Potential Windows. United States. https://doi.org/10.1002/cssc.201903011
Munteshari, Obaidallah, Borenstein, Arie, DeBlock, Ryan H., Lau, Jonathan, Whang, Grace, Zhou, Yucheng, Likitchatchawankun, Ampol, Kaner, Richard B., Dunn, Bruce, and Pilon, Laurent. Wed . "In Operando Calorimetric Measurements for Activated Carbon Electrodes in Ionic Liquid Electrolytes under Large Potential Windows". United States. https://doi.org/10.1002/cssc.201903011. https://www.osti.gov/servlets/purl/1767534.
@article{osti_1767534,
title = {In Operando Calorimetric Measurements for Activated Carbon Electrodes in Ionic Liquid Electrolytes under Large Potential Windows},
author = {Munteshari, Obaidallah and Borenstein, Arie and DeBlock, Ryan H. and Lau, Jonathan and Whang, Grace and Zhou, Yucheng and Likitchatchawankun, Ampol and Kaner, Richard B. and Dunn, Bruce and Pilon, Laurent},
abstractNote = {This study aims to investigate the effect of the potential window on heat generation in carbon-based electrical double layer capacitors (EDLCs) with ionic-liquid (IL)-based electrolytes using in operando calorimetry. The EDLCs consisted of two identical activated-carbon electrodes with either neat 1-butyl-1-methylpyrrolidinium bis(trifluoromethane-sulfonyl)imide ([Pyr14][TFSI]) electrolyte or 1.0 m [Pyr14][TFSI] in propylene carbonate (PC) as electrolyte. The instantaneous heat generation rate at each electrode was measured under galvanostatic cycling for different potential windows ranging from 1 to 4 V. First, the heat generation rates at the positive and negative electrodes differed significantly in neat IL owing to the differences in the ion sizes and diffusion coefficients. However, these differences were minimized when the IL was diluted in PC. Second, for EDLC in neat [Pyr14][TFSI] at high potential window (4 V), a pronounced endothermic peak was observed at the beginning of the charging step at the positive electrode owing to TFSI- intercalation in the activated carbon. On the other hand, for EDLC in 1.0 m [Pyr14][TFSI] in PC at potential window above 3 V, an endothermic peak was observed only at the negative electrode owing to the decomposition of PC. Third, for both neat and diluted [Pyr14][TFSI] electrolytes, the irreversible heat generation rate increased with increasing potential window and exceeded Joule heating. This was attributed to the effect of potential-dependent charge redistribution resistance. Additionally, a further increase in the irreversible heat generation rate was observed for the largest potential windows owing to the degradation of the PC solvent. Finally, for both types of electrolyte, the reversible heat generation rate increased with increasing potential window because of the increase in the amount of ion adsorbed/desorbed at the electrode/electrolyte interface.},
doi = {10.1002/cssc.201903011},
journal = {ChemSusChem},
number = 5,
volume = 13,
place = {United States},
year = {Wed Jan 29 00:00:00 EST 2020},
month = {Wed Jan 29 00:00:00 EST 2020}
}

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