U.S. Department of EnergyOffice of Scientific and Technical Information
Widening Electrochemical Window of Mg Salt by Weakly Coordinating Perfluoroalkoxyaluminate Anion for Mg Battery Electrolyte
Abstract
Energy storage concepts based on multivalent ion chemistries, such as Mg2+, promise very high volumetric energy density, however require improvements in electrolyte (Mg salt and solvent) electrochemical window to reach their full potential. Hypothetically the window of Mg salt could be widened by disfavoring the cathodic decomposition pathway of a thermodynamically and anodically stable anion, rendering it kinetically inert toward Mg+-mediated reduction. Computational and electrochemical analyses on Mg[TPFA]2 ([TPFA]- = [Al{OC(CF3)3}4]-) support this hypothesis, and showcase a widened electrochemical window as a result of mitigated cathodic decomposition as well as enhanced anodic stability from electron-withdrawing CF3 groups. Detailed NMR and IR spectroscopy and scanning electron microscopy/energy-dispersive X-ray spectroscopy further support that the weak coordination to Mg2+ in solution is important for maintaining the wide electrochemical window of Mg salt.
- Authors:
-
[1];
[1]
- Joint Center for Energy Storage Research, Lemont, IL (United States); Argonne National Laboratory (ANL), Lemont, IL (United States). Chemical Sciences and Engineering Division
- Joint Center for Energy Storage Research, Lemont, IL (United States); Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)
- Joint Center for Energy Storage Research, Lemont, IL (United States)
- Joint Center for Energy Storage Research, Lemont, IL (United States); Sandia National Laboratory (SNL-NM), Albuquerque, NM (United States)
- Joint Center for Energy Storage Research, Lemont, IL (United States); Argonne National Laboratory (ANL), Lemont, IL (United States)
- Joint Center for Energy Storage Research, Lemont, IL (United States); Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States); University of California, Berkeley, CA (United States)
- Publication Date:
- Research Org.:
- Argonne National Lab. (ANL), Argonne, IL (United States); Sandia National Lab. (SNL-NM), Albuquerque, NM (United States); Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
- Sponsoring Org.:
- USDOE Office of Science (SC), Basic Energy Sciences (BES)
- OSTI Identifier:
- 1542632
- Grant/Contract Number:
- AC02-06CH11357
- Resource Type:
- Journal Article: Accepted Manuscript
- Journal Name:
- Journal of the Electrochemical Society
- Additional Journal Information:
- Journal Volume: 166; Journal Issue: 8; Journal ID: ISSN 0013-4651
- Publisher:
- IOP Publishing
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 25 ENERGY STORAGE; batteries, energy storage, battery, electrolyte, weakly coordinating anion
Citation Formats
Lau, Ka-Cheong, Seguin, Trevor J., Carino, Emily V., Hahn, Nathan T., Connell, Justin G., Ingram, Brian J., Persson, Kristin A., Zavadil, Kevin R., and Liao, Chen. Widening Electrochemical Window of Mg Salt by Weakly Coordinating Perfluoroalkoxyaluminate Anion for Mg Battery Electrolyte. United States: N. p., 2019.
Web. doi:10.1149/2.0751908jes.
Lau, Ka-Cheong, Seguin, Trevor J., Carino, Emily V., Hahn, Nathan T., Connell, Justin G., Ingram, Brian J., Persson, Kristin A., Zavadil, Kevin R., & Liao, Chen. Widening Electrochemical Window of Mg Salt by Weakly Coordinating Perfluoroalkoxyaluminate Anion for Mg Battery Electrolyte. United States. https://doi.org/10.1149/2.0751908jes
Lau, Ka-Cheong, Seguin, Trevor J., Carino, Emily V., Hahn, Nathan T., Connell, Justin G., Ingram, Brian J., Persson, Kristin A., Zavadil, Kevin R., and Liao, Chen. 2019.
"Widening Electrochemical Window of Mg Salt by Weakly Coordinating Perfluoroalkoxyaluminate Anion for Mg Battery Electrolyte". United States. https://doi.org/10.1149/2.0751908jes. https://www.osti.gov/servlets/purl/1542632.
@article{osti_1542632,
title = {Widening Electrochemical Window of Mg Salt by Weakly Coordinating Perfluoroalkoxyaluminate Anion for Mg Battery Electrolyte},
author = {Lau, Ka-Cheong and Seguin, Trevor J. and Carino, Emily V. and Hahn, Nathan T. and Connell, Justin G. and Ingram, Brian J. and Persson, Kristin A. and Zavadil, Kevin R. and Liao, Chen},
abstractNote = {Energy storage concepts based on multivalent ion chemistries, such as Mg2+, promise very high volumetric energy density, however require improvements in electrolyte (Mg salt and solvent) electrochemical window to reach their full potential. Hypothetically the window of Mg salt could be widened by disfavoring the cathodic decomposition pathway of a thermodynamically and anodically stable anion, rendering it kinetically inert toward Mg+-mediated reduction. Computational and electrochemical analyses on Mg[TPFA]2 ([TPFA]- = [Al{OC(CF3)3}4]-) support this hypothesis, and showcase a widened electrochemical window as a result of mitigated cathodic decomposition as well as enhanced anodic stability from electron-withdrawing CF3 groups. Detailed NMR and IR spectroscopy and scanning electron microscopy/energy-dispersive X-ray spectroscopy further support that the weak coordination to Mg2+ in solution is important for maintaining the wide electrochemical window of Mg salt.},
doi = {10.1149/2.0751908jes},
url = {https://www.osti.gov/biblio/1542632},
journal = {Journal of the Electrochemical Society},
issn = {0013-4651},
number = 8,
volume = 166,
place = {United States},
year = {Thu May 02 00:00:00 EDT 2019},
month = {Thu May 02 00:00:00 EDT 2019}
}
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