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Hartmann, Felix; Liers, Lina; Etter, Martin; Terraschke, Huayna; Bensch, Wolfgang

Is there a common reaction pathway for chromium sulfides as anodes in sodium-ion batteries? A case study about sodium storage properties of MCr2S4 (M = Cr, Ti, Fe)

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  • Medientyp: E-Artikel
  • Titel: Is there a common reaction pathway for chromium sulfides as anodes in sodium-ion batteries? A case study about sodium storage properties of MCr2S4 (M = Cr, Ti, Fe)
  • Beteiligte: Hartmann, Felix; Liers, Lina; Etter, Martin; Terraschke, Huayna; Bensch, Wolfgang
  • Erschienen: Springer Science and Business Media LLC, 2022
  • Erschienen in: Journal of Solid State Electrochemistry
  • Sprache: Englisch
  • DOI: 10.1007/s10008-022-05246-3
  • ISSN: 1432-8488; 1433-0768
  • Schlagwörter: Electrical and Electronic Engineering ; Electrochemistry ; Condensed Matter Physics ; General Materials Science
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  • Beschreibung: <jats:title>Abstract </jats:title><jats:p>We present new insights into the electrochemical properties of three metal sulfides MCr<jats:sub>2</jats:sub>S<jats:sub>4</jats:sub> (<jats:italic>M</jats:italic> = Cr, Ti, Fe) probed as anode materials in sodium-ion batteries for the first time. The electrodes deliver decent reversible capacities and good long-term cycle stability, e.g., 470, 375, and 524 mAh g<jats:sup>−1</jats:sup> are obtained after 200 cycles applying 0.5 A g<jats:sup>−1</jats:sup> for <jats:italic>M</jats:italic> = Cr, Ti, and Fe, respectively. The reaction mechanisms are investigated via synchrotron-based X-ray powder diffraction and pair distribution function analyses. The highly crystalline educts are decomposed into Na<jats:sub>2</jats:sub>S nanoparticles and ultra-small metal particles during initial discharge without formation of intermediate NaCrS<jats:sub>2</jats:sub> domains as previously reported for CuCrS<jats:sub>2</jats:sub> and NiCr<jats:sub>2</jats:sub>S<jats:sub>4</jats:sub>. After a full cycle, the structural integrity of MCr<jats:sub>2</jats:sub>S<jats:sub>4</jats:sub> (<jats:italic>M</jats:italic> = Cr, Ti, Fe) is not recovered. Thus, the Na storage properties are attributed to redox reactions between nanoscopic to X-ray amorphous conversion products with only local atomic correlations M···S/S···S in the charged and M···M/Na···S in the discharged state.</jats:p> <jats:p><jats:bold>Graphical Abstract</jats:bold></jats:p>