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Concentrated lithium salt-monoglyme complex for restraining polysulfide dissolution and improving electrochemical performance of lithium-sulfur batteries

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Abstract

Concentrated lithium salt-monoglyme complex was used as an electrolyte candidate of lithium-sulfur (Li-S) batteries. It is found that the limited content of monoglyme suppresses the solubility and shuttle of polysulfides in the electrolyte. Then 1,1,2,2-tetrafluoroethyl 2,2,2-trifluoroethyl ether (TFTFE) was selected as a second solvent of the complex, and the effect of adding TFTFE on electrolyte properties and cell performances was investigated. The results indicate that the fluorinated ether further reduces the dissolution of polysulfides and improves the specific capacity and cycle stability of the cells. Certain polarization appears in the discharge stage if using excess TFTFE, but it is nearly harmless to the operation of the cell at higher rates. The combination of concentrated complex and fluorinated ether in the electrolyte is an effective approach to achieve excellent performance for Li-S batteries.

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Acknowledgments

The authors thank the financial support of the National Natural Science Foundation of China (No.21204072).

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Authors and Affiliations

  1. School of Materials Science and Engineering, Xi’an University of Science and Technology, Xi’an, 710054, China

    Hai Lu, Qinghao Yang & Zhenzhong Hou

  2. School of Metallurgical Engineering, Xi’an University of Architecture and Technology, Xi’an, 710055, China

    Yan Yuan

  3. School of Metallurgy and Environment, Central South University, Changsha, 410083, China

    Yanqing Lai

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  1. Hai Lu
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  2. Yan Yuan
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  3. Qinghao Yang
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  4. Zhenzhong Hou
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Correspondence to Hai Lu.

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Lu, H., Yuan, Y., Yang, Q. et al. Concentrated lithium salt-monoglyme complex for restraining polysulfide dissolution and improving electrochemical performance of lithium-sulfur batteries. Ionics 22, 997–1002 (2016). https://doi.org/10.1007/s11581-016-1714-1

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  • DOI: https://doi.org/10.1007/s11581-016-1714-1

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