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Title: Widening Electrochemical Window of Mg Salt by Weakly Coordinating Perfluoroalkoxyaluminate Anion for Mg Battery Electrolyte

Journal Article · · Journal of the Electrochemical Society
DOI:https://doi.org/10.1149/2.0751908jes· OSTI ID:1542632
ORCiD logo [1];  [2];  [3];  [4];  [3];  [5];  [6];  [4]; ORCiD logo [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
  2. Joint Center for Energy Storage Research, Lemont, IL (United States); Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)
  3. Joint Center for Energy Storage Research, Lemont, IL (United States)
  4. Joint Center for Energy Storage Research, Lemont, IL (United States); Sandia National Laboratory (SNL-NM), Albuquerque, NM (United States)
  5. Joint Center for Energy Storage Research, Lemont, IL (United States); Argonne National Laboratory (ANL), Lemont, IL (United States)
  6. 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)
+ Show Author Affiliations

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.

Research Organization:
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 Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES)
Grant/Contract Number:
AC02-06CH11357
OSTI ID:
1542632
Journal Information:
Journal of the Electrochemical Society, Vol. 166, Issue 8; ISSN 0013-4651
Publisher:
IOP PublishingCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 44 works
Citation information provided by
Web of Science

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Related Subjects

25 ENERGY STORAGE
batteries
energy storage
battery
electrolyte
weakly coordinating anion