Journal
CHEMSUSCHEM
Volume 8, Issue 2, Pages 353-360Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/cssc.201402800
Keywords
electrochemistry; ionic liquids; lithium-sulfur batteries; polymers; sulfones
Funding
- U.S. Department of Energy's Office of Basic Energy Science, Division of Materials Sciences and Engineering
- Joint Center for Energy Storage Research, an Energy Innovation Hub - U.S. Department of Energy, Office of Science, Basic Energy Sciences
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A strategy of mixing both an ionic liquid and sulfone is reported to give synergistic effects of reducing viscosity, increasing ionic conductivity, reducing polysulfide dissolution, and improving safety. The mixtures of ionic liquids and sulfones also show distinctly different physicochemical properties, including thermal properties and crystallization behavior. By using these electrolytes, lithium sulfur batteries assembled with lithium and mesoporous carbon composites show a reversible specific capacity of 1265 mAhg(-1) (second cycle) by using 40% 1.0M lithium bis(trifluoromethylsulfonyl) imide (LiTFSI) in N-methyl-N-propylpyrrolidinium bis(trifluoromethylsulfonyl) imide with 60% 1.0M LiTFSI in methylisopropylsulfone in the first cycle. This capacity is slightly lower than that obtained in pure 1.0m LiTFSI as the sulfone electrolyte; however, it exhibits excellent cycling stability and remains as high as 655 mAhg(-1) even after 50 cycles. This strategy provides a method to alleviate polysulfide dissolution and redox shuttle phenomena, at the same time, with improved ionic conductivity.
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