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

Ulderico Ulissi1,2, Giuseppe Antonio Elia3, Sangsik Jeong1,2

  • 1Helmholtz Institute Ulm (HIU), Helmholtzstrasse 11, 89081, Ulm, Germany.

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|September 30, 2017
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Summary
This summary is machine-generated.

A novel molten salt electrolyte, [DEME][TFSI]-LiTFSI, demonstrates excellent performance for lithium-oxygen (Li-O2) batteries. This ionic liquid electrolyte enables high capacity, efficiency, and reversible cycling, even at elevated temperatures.

Keywords:
conversion-alloying anodeionic liquidsiron-doped zinc oxidelithium-oxygen batteriestemperature dependence

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Area of Science:

  • Electrochemistry
  • Materials Science
  • Energy Storage

Background:

  • Lithium-oxygen (Li-O2) batteries offer high theoretical energy density but face challenges with electrolyte stability and cycling performance.
  • Developing advanced electrolytes is crucial for overcoming these limitations and enabling practical Li-O2 battery applications.

Purpose of the Study:

  • To investigate the potential of a room-temperature molten salt mixture, [DEME][TFSI]-LiTFSI, as an electrolyte for Li-O2 batteries.
  • To evaluate the electrolyte's properties, including ionic conductivity, viscosity, electrochemical stability, and compatibility with lithium metal.
  • To assess the electrochemical performance and cycling behavior of Li-O2 cells using this novel electrolyte.

Main Methods:

  • Characterization of the [DEME][TFSI]-LiTFSI electrolyte's physicochemical properties (ionic conductivity, viscosity) at various temperatures.
  • Electrochemical stability window and lithium metal compatibility testing.
  • Assembly and testing of Li-O2 cells with the [DEME][TFSI]-LiTFSI electrolyte, including galvanostatic cycling and ex-situ analysis (XRD, SEM).
  • Evaluation of a Li-ion/oxygen configuration using a carbon-coated Zn0.9Fe0.1O (TMO-C) anode.

Main Results:

  • The [DEME][TFSI]-LiTFSI electrolyte exhibits suitable properties for Li-O2 batteries, including good ionic conductivity and electrochemical stability.
  • Li-O2 cells demonstrated reversible discharge-charge performance with a capacity of ~13.5 Ah/g-carbon and coulombic efficiency near 100%.
  • Ex-situ XRD and SEM confirmed the reversibility of the oxygen reduction and evolution reactions (ORR/OER).
  • Cycling at elevated temperatures (30-60°C) showed enhanced energy efficiency and distinct morphology changes in deposited species.

Conclusions:

  • The [DEME][TFSI]-LiTFSI molten salt mixture is a promising electrolyte for high-performance Li-O2 batteries.
  • The electrolyte facilitates efficient and reversible oxygen electrochemistry, crucial for battery operation.
  • Temperature variations impact energy efficiency and electrode morphology, offering insights for optimization.
  • Preliminary results suggest potential for ionic-liquid-based Li-ion/oxygen configurations with advanced anodes.