Low-Polarization Lithium–Oxygen Battery Using [DEME][TFSI] Ionic Liquid Electrolyte

Ulderico Ulissi, Giuseppe Antonio Elia, Sangsik Jeong, Franziska Mueller, Jakub Reiter, Nikolaos Tsiouvaras, Yang Kook Sun, Bruno Scrosati, Stefano Passerini, Jusef Hassoun

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Abstract

The room-temperature molten salt mixture of N,N-diethyl-N-(2-methoxyethyl)-N-methylammonium bis(trifluoromethanesulfonyl) imide ([DEME][TFSI]) and lithium bis(trifluoromethanesulfonyl)imide (LiTFSI) salt is herein reported as electrolyte for application in Li–O2 batteries. The [DEME][TFSI]–LiTFSI solution is studied in terms of ionic conductivity, viscosity, electrochemical stability, and compatibility with lithium metal at 30 °C, 40 °C, and 60 °C. The electrolyte shows suitable properties for application in Li–O2 battery, allowing a reversible, low-polarization discharge–charge performance with a capacity of about 13 Ah g-1carbon in the positive electrode and coulombic efficiency approaching 100 %. The reversibility of the oxygen reduction reaction (ORR)/oxygen evolution reaction (OER) is demonstrated by ex situ XRD and SEM studies. Furthermore, the study of the cycling behavior of the Li–O2 cell using the [DEME][TFSI]-LiTFSI electrolyte at increasing temperatures (from 30 to 60 °C) evidences enhanced energy efficiency together with morphology changes of the deposited species at the working electrode. In addition, the use of carbon-coated Zn0.9Fe0.1O (TMO-C) lithium-conversion anode in an ionic-liquid-based Li-ion/oxygen configuration is preliminarily demonstrated.

Original languageEnglish
Pages (from-to)229-236
Number of pages8
JournalChemSusChem
Volume11
Issue number1
DOIs
StatePublished - 2018 Jan 10

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Keywords

  • conversion-alloying anode
  • ionic liquids
  • iron-doped zinc oxide
  • lithium–oxygen batteries
  • temperature dependence

Cite this

Ulissi, U., Elia, G. A., Jeong, S., Mueller, F., Reiter, J., Tsiouvaras, N., Sun, Y. K., Scrosati, B., Passerini, S., & Hassoun, J. (2018). Low-Polarization Lithium–Oxygen Battery Using [DEME][TFSI] Ionic Liquid Electrolyte. ChemSusChem, 11(1), 229-236. https://doi.org/10.1002/cssc.201701696