Improvement of Cycle Capability of FeS2 Positive Electrode by Forming Composites with Li2S for Ambient Temperature Lithium Batteries

  • Takeuchi T
  • Kageyama H
  • Nakanishi K
 et al. 
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FeS2-Li2Scomposite positive electrode material, consisted of mainly Li3Fe2S4 and Li2.33Fe0.67S2,was prepared for improving the cycle capability of FeS2 inrechargeable lithium batteries with liquid electrolytes operated at ambient temperature.The electrochemical tests demonstrated that the FeS2-Li2S composite cells showeda relatively higher capacity retention after 15 cycles (ca. 64%)as compared with that of the FeS2 cells (ca. 26%),though both sample cells showed comparable initial discharge capacities (ca.740 and 790 mAh·g−1 (4.2 and 4.5 mAh·cm−2), respectively). Theimproved cycle capability of the FeS2-Li2S cells was ascribed particularlyto rather unchanged discharge plateau at ca. 2.0 V, whichwas reported to correspond to the reduction of sulfur. Theex-situ S K-edge X-ray absorption fine structure measurements indicated thatthe redox reaction of sulfur ions (S + 2e−2S2−), associated with Li extraction / insertion reactions, was stillactive after 15 cycles in the FeS2-Li2S electrode, while suchredox reactions almost disappeared in the FeS2 electrode. The atomicdisplacements required in the initial delithiation / lithiation were reducedin the FeS2-Li2S composite as compared with FeS2, which wouldgive rise to the suppression of the structural irreversibility inthe following charge / discharge, resulting in the improved cyclecapability.\r
©2011 The Electrochemical Society

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  • Tomonari Takeuchi

  • Hiroyuki Kageyama

  • Koji Nakanishi

  • Yasuhiro Inada

  • Misaki Katayama

  • Toshiaki Ohta

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