Improvement of cycle capability of Fe-substituted Li2S-based positive electrode materials by doping with lithium iodide

Tomonari Takeuchi, Hiroyuki Kageyama, Koji Nakanishi, Hisao Kiuchi, Misaki Katayama, Yasuhiro Inada, Toshiaki Ohta, Toshiharu Fukunaga, Hikari Sakaebe, Hironori Kobayashi, Eiichiro Matsubara

Research output: Contribution to journalArticlepeer-review


For an attempt to improve the cycle capability of the Li8FeS5 cells, we have prepared LiI-doped Li8FeS5 composite positive electrode materials. The obtained Li8FeS5 · xLiI sample cells showed the improved cycle capability, though the initial capacity value decreased with proportional to the mass of LiI. The improved cycle performance was attributable to the suppressed resistance rise of the cells, due probably to the suppression of high-resistive surface precipitates formed by the reaction between the active material and the electrolyte. The dopant LiI would stabilize the local structure against Li extraction/insertion reactions, as well as suppress the reaction with the electrolyte, leading to the improved cycle performance.

Original languageEnglish
Pages (from-to)A5231-A5236
JournalJournal of the Electrochemical Society
Issue number3
Publication statusPublished - 2019
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Renewable Energy, Sustainability and the Environment
  • Surfaces, Coatings and Films
  • Electrochemistry
  • Materials Chemistry


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