Preparation of Li<sub>2</sub>S-FeS<sub>2</sub> Composite Electrode Materials and their Electrochemical Properties

DOI Web Site 19 References
  • TAKEUCHI Tomonari
    National Institute of Advanced Industrial Science and Technology (AIST)
  • KAGEYAMA Hiroyuki
    National Institute of Advanced Industrial Science and Technology (AIST)
  • NAKANISHI Koji
    Office of Society-Academia Collaboration for Innovation, Kyoto University
  • OHTA Toshiaki
    Synchrotron Radiation Center, Ritsumeikan University
  • SAKUDA Atsushi
    National Institute of Advanced Industrial Science and Technology (AIST)
  • SAKEBE Hikari
    National Institute of Advanced Industrial Science and Technology (AIST)
  • SENOH Hiroshi
    National Institute of Advanced Industrial Science and Technology (AIST)
  • SAKAI Tetsuo
    National Institute of Advanced Industrial Science and Technology (AIST)
  • TATSUMI Kuniaki
    National Institute of Advanced Industrial Science and Technology (AIST)
  • KOBAYASHI Hironori
    National Institute of Advanced Industrial Science and Technology (AIST)
  • OGUMI Zempachi
    Office of Society-Academia Collaboration for Innovation, Kyoto University

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Other Title
  • Li<sub>2</sub>S-FeS<sub>2 </sub>複合体の作製とその充放電特性
  • Li ₂ S-FeS ₂ フクゴウタイ ノ サクセイ ト ソノ ジュウホウデン トクセイ

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Abstract

Li2S-FeS2 composite positive electrode materials were prepared for improving the discharge capacity of the all-solid-state In/Li2S cells via the electrical conductivity enhancement of Li2S. The electrochemical tests demonstrated that the In/Li2S-FeS2 (Li2S : FeS2 = 3 : 7 wt) cells showed relatively higher discharge capacity (ca. 180 mAh • g−1, normalized by the cathode weight) than that of the In/Li2S-C cells (ca. 140 mAh • g−1), due to the increased fraction of the active materials in the cathodes. The ex-situ XRD and S K-edge XAFS results indicated that the In/Li2S- FeS2 cells showed similar electrochemical reaction to that of the Li/Li2S-FeS2 cells with liquid electrolytes during charge, but did not proceed to form Li2S and Fe during discharge. Such difference was due to the limited amounts of Li ions supplied from the lithiated-In anode during discharge for the In/Li2S-FeS2 cells.

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