Amorphous Metal Polysulfides: Electrode Materials with Unique Insertion/Extraction Reactions

Atsushi Sakuda, Koji Ohara, Katsutoshi Fukuda, Koji Nakanishi, Tomoya Kawaguchi, Hajime Arai, Yoshiharu Uchimoto, Toshiaki Ohta, Eiichiro Matsubara, Zempachi Ogumi, Toyoki Okumura, Hironori Kobayashi, Hiroyuki Kageyama, Masahiro Shikano, Hikari Sakaebe, Tomonari Takeuchi

Research output: Contribution to journalArticlepeer-review

79 Citations (Scopus)


A unique charge/discharge mechanism of amorphous TiS4 is reported. Amorphous transition metal polysulfide electrodes exhibit anomalous charge/discharge performance and should have a unique charge/discharge mechanism: neither the typical intercalation/deintercalation mechanism nor the conversion-type one, but a mixture of the two. Analyzing the mechanism of such electrodes has been a challenge because fewer tools are available to examine the "amorphous" structure. It is revealed that the electrode undergoes two distinct structural changes: (i) the deformation and formation of S-S disulfide bonds and (ii) changes in the coordination number of titanium. These structural changes proceed continuously and concertedly for Li insertion/extraction. The results of this study provide a novel and unique model of amorphous electrode materials with significantly larger capacities.

Original languageEnglish
Pages (from-to)8796-8799
Number of pages4
JournalJournal of the American Chemical Society
Issue number26
Publication statusPublished - Jul 5 2017
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Catalysis
  • General Chemistry
  • Biochemistry
  • Colloid and Surface Chemistry


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