Synthesis and Characterization of MgCr2S4 Thiospinel as a Potential Magnesium Cathode

Allison Wustrow, Baris Key, Patrick J. Phillips, Niya Sa, Andrew S. Lipton, Robert F. Klie, John T. Vaughey, Kenneth R. Poeppelmeier*

*Corresponding author for this work

Research output: Contribution to journalArticle

14 Scopus citations

Abstract

Magnesium-ion batteries are a promising energy storage technology because of their higher theoretical energy density and lower cost of raw materials. Among the major challenges has been the identification of cathode materials that demonstrate capacities and voltages similar to lithium-ion systems. Thiospinels represent an attractive choice for new Mg-ion cathode materials owing to their interconnected diffusion pathways and demonstrated high cation mobility in numerous systems. Reported magnesium thiospinels, however, contain redox inactive metals such as scandium or indium, or have low voltages, such as MgTi2S4. This article describes the direct synthesis and structural and electrochemical characterization of MgCr2S4, a new thiospinel containing the redox active metal chromium and discusses its physical properties and potential as a magnesium battery cathode. However, as chromium(III) is quite stable against oxidation in sulfides, removing magnesium from the material remains a significant challenge. Early attempts at both chemical and electrochemical demagnesiation are discussed.

Original languageEnglish (US)
Pages (from-to)8634-8638
Number of pages5
JournalInorganic chemistry
Volume57
Issue number14
DOIs
StatePublished - Jul 16 2018

ASJC Scopus subject areas

  • Physical and Theoretical Chemistry
  • Inorganic Chemistry

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    Wustrow, A., Key, B., Phillips, P. J., Sa, N., Lipton, A. S., Klie, R. F., Vaughey, J. T., & Poeppelmeier, K. R. (2018). Synthesis and Characterization of MgCr2S4 Thiospinel as a Potential Magnesium Cathode. Inorganic chemistry, 57(14), 8634-8638. https://doi.org/10.1021/acs.inorgchem.8b01417