Effect of sulfur loading on energy density of lithium sulfur batteries

Authors

  • Sung-Hwan Kang,

    1. Department of Materials Engineering and Convergence Technology, Gyeongsang National University, Jinju, Republic of Korea
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  • Xiaohui Zhao,

    1. Department of Chemical and Biological Engineering and Engineering Research Institute, Gyeongsang National University, Jinju, Republic of Korea
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  • James Manuel,

    1. Department of Chemical and Biological Engineering and Engineering Research Institute, Gyeongsang National University, Jinju, Republic of Korea
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  • Hyo-Jun Ahn,

    1. Department of Materials Engineering and Convergence Technology, Gyeongsang National University, Jinju, Republic of Korea
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  • Ki-Won Kim,

    1. Department of Materials Engineering and Convergence Technology, Gyeongsang National University, Jinju, Republic of Korea
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  • Kwon-Koo Cho,

    Corresponding author
    1. Department of Materials Engineering and Convergence Technology, Gyeongsang National University, Jinju, Republic of Korea
    • Corresponding authors: e-mail jhahn@gnu.ac.kr, Phone: +82 55 772 1784, Fax: +82 55 772 1789

      e-mail kkcho66@gnu.ac.kr, Phone: +82 55 772 1668, Fax: +82 55 772 1670

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  • Jou-Hyeon Ahn

    Corresponding author
    1. Department of Materials Engineering and Convergence Technology, Gyeongsang National University, Jinju, Republic of Korea
    2. Department of Chemical and Biological Engineering and Engineering Research Institute, Gyeongsang National University, Jinju, Republic of Korea
    • Corresponding authors: e-mail jhahn@gnu.ac.kr, Phone: +82 55 772 1784, Fax: +82 55 772 1789

      e-mail kkcho66@gnu.ac.kr, Phone: +82 55 772 1668, Fax: +82 55 772 1670

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Abstract

During discharge of lithium sulfur (Li–S) battery with a liquid electrolyte system, sulfur is first reduced to Li2S8, which is dissolved into the organic electrolyte and this serves as the liquid cathode. In solution, lithium polysulfides undergo a series of chemical reactions and their concentration varies during cell reaction. The amount of sulfur and electrolytes in the system plays an important role in determining the cell performance. In this work, the effect of sulfur loading in cathode and the amount of electrolyte on the energy density and cycle performance of Li–S battery has been investigated. Cathodes with sulfur loading of 0.99, 2.98, and 6.80 mg_S cm−2 were prepared. Precisely controlled amount of electrolyte was added with varied electrolyte/sulfur (E/S) ratios of 1.67, 5, 10, 20, and 40 µl/mg_S. The surface morphology of fresh and cycled sulfur cathodes was characterized using scanning electron microscopy (SEM) and energy dispersive spectroscopy (EDS).

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