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Role of the Lithium Salt in the Performance of Lithium–Oxygen Batteries: A Comparative Study

Authors

  • Giuseppe Antonio Elia,

    1. Department of Chemistry, University of Rome Sapienza, 00185, Rome (Italy)
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  • Jin-Bum Park,

    1. Department of Energy Engineering and Department of Materials Science and Engineering, Hanyang University, Seoul 133-791 (South Korea)
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  • Prof. Yang-Kook Sun,

    Corresponding author
    1. Department of Energy Engineering and Department of Materials Science and Engineering, Hanyang University, Seoul 133-791 (South Korea)
    2. Department of Chemistry, King Abdulaziz University, P. O. Box 80203, Jeddah 21589 (Saudi Arabia)
    • Yang-Kook Sun, Department of Energy Engineering and Department of Materials Science and Engineering, Hanyang University, Seoul 133-791 (South Korea)===

      Bruno Scrosati, Department of Chemistry, University of Rome Sapienza, 00185, Rome (Italy)===

      Jusef Hassoun, Department of Chemistry, University of Rome Sapienza, 00185, Rome (Italy)===

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  • Prof. Bruno Scrosati,

    Corresponding author
    1. Department of Chemistry, University of Rome Sapienza, 00185, Rome (Italy)
    2. Elettrochimica ed Energia, Rome (Italy)
    • Yang-Kook Sun, Department of Energy Engineering and Department of Materials Science and Engineering, Hanyang University, Seoul 133-791 (South Korea)===

      Bruno Scrosati, Department of Chemistry, University of Rome Sapienza, 00185, Rome (Italy)===

      Jusef Hassoun, Department of Chemistry, University of Rome Sapienza, 00185, Rome (Italy)===

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  • Dr. Jusef Hassoun

    Corresponding author
    1. Department of Chemistry, University of Rome Sapienza, 00185, Rome (Italy)
    • Yang-Kook Sun, Department of Energy Engineering and Department of Materials Science and Engineering, Hanyang University, Seoul 133-791 (South Korea)===

      Bruno Scrosati, Department of Chemistry, University of Rome Sapienza, 00185, Rome (Italy)===

      Jusef Hassoun, Department of Chemistry, University of Rome Sapienza, 00185, Rome (Italy)===

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Abstract

In this paper we report a comparative study of the electrochemical properties of a lithium–oxygen cell using a tetraethylene glycol dimethyl ether (TEGDME)-based electrolyte solution with four different lithium salts, namely, lithium-bis-(trifluormethanesulfonyl)-imide, LiN(SO2CF3)2, lithium trifluoromethanesulfonate, LiCF3SO3, lithium perchlorate, LiClO4, and lithium hexafluorophosphate, LiPF6. This study evidences the role of the electrolyte salt in affecting the cell polarization as a reflection of its specific properties in terms of lithium transference number and interface resistance. LiCF3SO3 is finally identified as the best choice for assuring low cell polarization.

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