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Ionic liquid hybrids: Progress toward non-corrosive electrolytes with high-voltage oxidation stability for magnesium-ion based batteries

Journal Article · · Electrochimica Acta
 [1];  [2];  [2];  [2];  [3];  [3];  [4]
  1. Stony Brook Univ., NY (United States). Dept. of Materials Science and Engineering
  2. Stony Brook Univ., NY (United States). Dept. of Chemistry
  3. Stony Brook Univ., NY (United States). Dept. of Materials Science and Engineering; Stony Brook Univ., NY (United States). Dept. of Chemistry
  4. Stony Brook Univ., NY (United States). Dept. of Materials Science and Engineering; Stony Brook Univ., NY (United States). Dept. of Chemistry; Brookhaven National Lab. (BNL), Upton, NY (United States)
Magnesium – ion batteries have the potential for high energy density but require new types of electrolytes for practical application. Ionic liquid (IL) electrolytes offer the opportunity for increased safety and broader voltage windows relative to traditional electrolytes. We present here a systematic study of both the conductivity and oxidative stability of hybrid electrolytes consisting of eleven ILs mixed with dipropylene glycol dimethylether (DPGDME) or acetonitrile (ACN) cosolvents and magnesium bis(trifluoromethylsulfonyl)imide (Mg(TFSI)2). Our study finds a correlation of higher conductivity of ILs with unsaturated rings and short carbon chain lengths, but by contrast, these ILs also exhibited lower oxidation voltage limits. For the cosolvent additive, although glymes have a demonstrated capability of coordination with Mg2+ ions, a decrease in conductivity compared to acetonitrile hybrid electrolytes was observed. Lastly, when cycled within the appropriate voltage range, the IL-hybrid electrolytes that show the highest conductivity provide the best cathode magnesiation current densities and lowest polarization as demonstrated with a Mg0.15MnO2 and Mg0.07V2O5 cathodes.
Research Organization:
Brookhaven National Laboratory (BNL), Upton, NY (United States)
Sponsoring Organization:
National Science Foundation (NSF); USDOE Office of Electricity (OE); USDOE Office of Science (SC), Basic Energy Sciences (BES); USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
Grant/Contract Number:
SC0012673; SC0012704
OSTI ID:
1341693
Alternate ID(s):
OSTI ID: 22656858
OSTI ID: 1388623
OSTI ID: 1398589
Report Number(s):
BNL--113438-2017-JA
Journal Information:
Electrochimica Acta, Journal Name: Electrochimica Acta Journal Issue: C Vol. 219; ISSN 0013-4686
Publisher:
ElsevierCopyright Statement
Country of Publication:
United States
Language:
English

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Cited By (2)

Mg Cathode Materials and Electrolytes for Rechargeable Mg Batteries: A Review journal January 2019
Novel and versatile room temperature ionic liquids for energy storage journal January 2019