Investigation on the structural evolutions during the insertion of aluminum ions into Mo6S8 Chevrel phase

Boeun Lee, Hae Ri Lee, Taeeun Yim, Jong Hak Kim, June Gunn Lee, Kyung Yoon Chung, Byung Won Cho, Si Hyoung Oh

Research output: Contribution to journalArticle

30 Citations (Scopus)

Abstract

Herein, we evaluate the detailed insertion mechanism of aluminum ions into the Mo6S8 Chevrel phase in the 1-ethyl-3-methylimidazolium tetrachloroaluminate ionic liquid through combined structural and electrochemical characterization. This involves two-step two-phase insertion reactions, where the first and the second step account for 3/4 and 1/4 of the total reversible capacity, respectively. During the first step, aluminum ions occupy the inner ring sites in the Chevrel phase, forming AlMo6S8 with a higher activation energy for cation diffusion. Subsequently, Al4/3Mo6S8 emerges as a discharge product during the second step, where one aluminum ion fills one outer ring site in every three AlMo6S8 units. The diffusion coefficient for aluminum ions through the Chevrel phase was found much lower than that of lithium or magnesium ions, reflecting the difficulties in redistributing trivalent charge carried by each aluminum ion.

Original languageEnglish
Pages (from-to)A1070-A1076
JournalJournal of the Electrochemical Society
Volume163
Issue number6
DOIs
Publication statusPublished - 2016 Jan 1

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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