Amorphous niobium sulfides as novel positive-electrode materials

Atsushi Sakuda, Noboru Taguchi, Tomonari Takeuchi, Hironori Kobayashi, Hikari Sakaebe, Kuniaki Tatsumi, Zempachi Ogumi

Research output: Contribution to journalArticlepeer-review

Abstract

Novel high-capacity electrode materials are required to increase the energy density of lithium-ion batteries. Metal polysulfides, MSx (x > 2), are plausible candidates for such materials, whose high capacities are owed to multielectron processes. Hence, we mechanochemically synthesized novel amorphous niobium sulfides (NbS3, NbS4, and NbS 5) at room temperature. The cells fabricated using amorphous NbS 3, NbS4, and NbS5 showed high initial discharge capacities of 281, 446, and 596 mAh g-1, corresponding to 2.0, 3.7, and 5.6 electron processes per formula unit, respectively. Remarkably, the cells using a carbonate-based electrolyte showed reversible high-capacity charging and discharging.

Original languageEnglish
Pages (from-to)A79-A81
JournalECS Electrochemistry Letters
Volume3
Issue number7
DOIs
Publication statusPublished - Jan 1 2014
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Fuel Technology
  • Electrochemistry
  • Materials Chemistry

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