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Nonpolar Solvent-based Electrolytes with a Quasi-Solid-State Redox Reaction for Lithium-Sulfur Batteries

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Authors

Yang, Hong Sun; Kim, Dong-Min; Kim, Youngjin; Lee, Young Joo; Lee, Kyu Tae

Issue Date
2021-06-14
Publisher
John Wiley and Sons Ltd
Citation
ChemElectroChem, Vol.8 No.12, pp.2321-2328
Abstract
Li-S batteries are one of the most promising next-generation batteries because of their high theoretical energy density and abundance of active material sulfur reducing the cost. However, conventional ether-based electrolytes suffer from active material loss due to side reactions between dissolved polysulfides and Li metal anode, and consequential shuttle phenomenon. Herein, a promising concept of nonpolar solvent-based electrolytes consisting of nonpolar solvent of 1,4-difluorobenzene, lithium bis(trifluoromethanesulfonyl)imide (LiTFSI) salt, and chelating agent for Li+ cations, such as 15-crown-5 or 1,3-dioxolane, is introduced to suppress the dissolution of polar polysulfides. Nonpolar electrolytes show a distinctive reaction mechanism that involved a quasi-solid-state redox reaction, compared to conventional ether-based electrolytes. The discharge and charge process of nonpolar electrolytes include phase transitions with sparingly soluble and insoluble polysulfides. As a result, nonpolar solvent-based electrolytes show excellent electrochemical performance, such as stable capacity retention and Coulombic efficiency of 93.1 % after 100 cycles at 30 degrees C.
ISSN
2196-0216
URI
https://hdl.handle.net/10371/178092
DOI
https://doi.org/10.1002/celc.202100578
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Lee, Kyu Tae이규태
Associate Professor
  • College of Engineering
  • School of Chemical and Biological Engineering
Research Area Electrochemical Engineering, Rechargeable Battery

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