Heat generation in electric double layer capacitors with neat and diluted ionic liquid electrolytes under large potential window between 5 and 80&nbsp;°C

Likitchatchawankun, Ampol; DeBlock, Ryan H.; Whang, Grace; Munteshari, Obaidallah; Frajnkovič, Matevž; Dunn, Bruce S.; Pilon, Laurent

doi:10.1016/j.jpowsour.2020.229368

Heat generation in electric double layer capacitors with neat and diluted ionic liquid electrolytes under large potential window between 5 and 80 °C

Journal Article · Thu Jan 07 00:00:00 EST 2021 · Journal of Power Sources

DOI:https://doi.org/10.1016/j.jpowsour.2020.229368· OSTI ID:1853153

Likitchatchawankun, Ampol ^[1]; ^[2]; ^[2]; ^[3]; ^[2]; ^[2]; ^[2]

Univ. of California, Los Angeles, CA (United States); Univ. of California, Los Angeles, CA (United States)
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)

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.

View Accepted Manuscript (DOE)

Research Organization:: Univ. of California, Los Angeles, CA (United States)

Sponsoring Organization:: USDOE; USDOE Office of Science (SC), Basic Energy Sciences (BES)

Grant/Contract Number:: SC0019381

OSTI ID:: 1853153

Alternate ID(s):: OSTI ID: 2325424

Journal Information:: Journal of Power Sources, Journal Name: Journal of Power Sources Journal Issue: C Vol. 488; ISSN 0378-7753

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

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Journal Article · Thu Sep 15 20:00:00 EDT 2022 · Journal of Power Sources · OSTI ID:2421229

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25 ENERGY STORAGE
36 MATERIALS SCIENCE
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
activated carbon
electrolyte degradation
heat generation
ionic liquid
thermal management
thermal runaway

Heat generation in electric double layer capacitors with neat and diluted ionic liquid electrolytes under large potential window between 5 and 80 °C

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