Journal
CHEMSUSCHEM
Volume 7, Issue 9, Pages 2457-2460Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/cssc.201402177
Keywords
electrolyte; energy storage; lithium disulfide; lithium polysulfide; lithium sulfur batteries
Funding
- U.S. Department of Energy
- Freedom CAR
- Vehicle Technologies Office
- Electron Microscopy Center for Materials Research at Argonne National Laboratory, a U.S. Department of Energy Office of Science Laboratory [DE-AC02-06CH11357]
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In this work, a novel lithium-sulfur battery was developed comprising Li2S as the cathode, lithium metal as the anode and polysulfide-based solution as the electrolyte. The electrochemical performances of these Li2S-based cells strongly depended upon the nature of the electrolytes. In the presence of the conventional electrolyte that consisted of lithium bis(trifluoromethanesulfonyl)- imide (LiTFSI) salt dissolved in a solvent combination of dimethoxyethane (DME)/1,3-dioxolane (DOL), the Li/Li2S cells showed sluggish kinetics, which translated into poor cycling and capacity retention. However, when using small amounts of polysulfides in the electrolyte along with a shuttle inhibitor the Li2S cathode was efficiently activated in the cell with the generation of over 1000 mAhg(-1) capacity and good cycle life.
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