Hunting ionic liquids with large electrochemical potential windows
Abstract
Ionic liquids (ILs) with large electrochemical potential windows (EPWs) are ideally suited to improve the energy and power density of electrical devices for energy storage. However, guidelines are scarcely available for the selection or systematic screening of ILs for practical applications. Here, we present theoretical predictions for the EPW of thousands of cation‐anion pairs based on a long‐range corrected hybrid density functional theory. The cathodic and anodic potential limits were estimated from the highest occupied molecular orbital and lowest unoccupied molecular orbital energies of individual cations and anions. The approximate method predicts EPWs in reasonable agreement with existing experimental data for several commonly used ionic systems and can be used as a screening tool for a large library of ILs. Five most stable anions, with the cathode stability in the order of B[CN] 4 > PF 6 > BF 4 > BOB>NTf 2 , have been identified. These anions provide the largest EPWs when they are paired with conventional organic cations. The cation stability is reduced upon elongation of the alkyl chain length or branching of the molecular backbone. © 2018 American Institute of Chemical Engineers AIChE J , 65: 804–810, 2019
- Authors:
-
- State Key Laboratory of Chemical Engineering, School of Chemistry and Molecular Engineering East China University of Science and Technology Shanghai 200237 China
- Key Laboratory for Ultrafine Materials of Ministry of Education, School of Materials Science and Engineering East China University of Science &, Technology Shanghai 200237 China
- Dept. of Chemical and Environmental Engineering University of California Riverside CA 92521
- Publication Date:
- Sponsoring Org.:
- USDOE
- OSTI Identifier:
- 1483705
- Resource Type:
- Publisher's Accepted Manuscript
- Journal Name:
- AIChE Journal
- Additional Journal Information:
- Journal Name: AIChE Journal Journal Volume: 65 Journal Issue: 2; Journal ID: ISSN 0001-1541
- Publisher:
- Wiley Blackwell (John Wiley & Sons)
- Country of Publication:
- United States
- Language:
- English
Citation Formats
Lian, Cheng, Liu, Honglai, Li, Chunzhong, and Wu, Jianzhong. Hunting ionic liquids with large electrochemical potential windows. United States: N. p., 2018.
Web. doi:10.1002/aic.16467.
Lian, Cheng, Liu, Honglai, Li, Chunzhong, & Wu, Jianzhong. Hunting ionic liquids with large electrochemical potential windows. United States. https://doi.org/10.1002/aic.16467
Lian, Cheng, Liu, Honglai, Li, Chunzhong, and Wu, Jianzhong. Wed .
"Hunting ionic liquids with large electrochemical potential windows". United States. https://doi.org/10.1002/aic.16467.
@article{osti_1483705,
title = {Hunting ionic liquids with large electrochemical potential windows},
author = {Lian, Cheng and Liu, Honglai and Li, Chunzhong and Wu, Jianzhong},
abstractNote = {Ionic liquids (ILs) with large electrochemical potential windows (EPWs) are ideally suited to improve the energy and power density of electrical devices for energy storage. However, guidelines are scarcely available for the selection or systematic screening of ILs for practical applications. Here, we present theoretical predictions for the EPW of thousands of cation‐anion pairs based on a long‐range corrected hybrid density functional theory. The cathodic and anodic potential limits were estimated from the highest occupied molecular orbital and lowest unoccupied molecular orbital energies of individual cations and anions. The approximate method predicts EPWs in reasonable agreement with existing experimental data for several commonly used ionic systems and can be used as a screening tool for a large library of ILs. Five most stable anions, with the cathode stability in the order of B[CN] 4 > PF 6 > BF 4 > BOB>NTf 2 , have been identified. These anions provide the largest EPWs when they are paired with conventional organic cations. The cation stability is reduced upon elongation of the alkyl chain length or branching of the molecular backbone. © 2018 American Institute of Chemical Engineers AIChE J , 65: 804–810, 2019},
doi = {10.1002/aic.16467},
journal = {AIChE Journal},
number = 2,
volume = 65,
place = {United States},
year = {Wed Nov 28 00:00:00 EST 2018},
month = {Wed Nov 28 00:00:00 EST 2018}
}
https://doi.org/10.1002/aic.16467
Web of Science
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