Mixed Anionic and Cationic Redox Chemistry in a Tetrathiomolybdate Amorphous Coordination Framework.

Angew Chem Int Ed Engl

Institute of Condensed Matter and Nanosciences, Molecular Chemistry, Materials and Catalysis, Université catholique de Louvain, 1348, Louvain-la-Neuve, Belgium.

Published: September 2020

AI Article Synopsis

  • The study investigates a new phase of Na MoS as an electrode material for Na- and Li-ion batteries, highlighting its unique amorphous coordination polymer structure with mixed valences of molybdenum (Mo) and sulfur (S).
  • The material shows a strong interaction between Mo and S during redox reactions, with no formation of unwanted byproducts like free sulfur or lithium sulfide, and behaves as a mixed ionic-electronic conductor with notable electronic conductivity.
  • The Na MoS achieves a reversible capacity of up to 500 mAh/g, indicating its potential for high-performance energy storage and contributing valuable insights into sulfide materials with diverse redox properties for battery applications.

Article Abstract

We report the electrochemistry of a hitherto unexplored Na MoS phase as a conversion electrode material for Na- and Li-ion batteries. The material adopts an amorphous coordination polymer structure with mixed Mo and S valences. XPS and XRD analysis reveal a complex interplay between Mo and S redox chemistry, while excluding the formation of free sulfur, lithium sulfide, or other crystalline phases. Na MoS behaves as a mixed ionic-electronic conductor, with electronic conductivity of 6.1×10  S cm , that permits carbon-free application in an electrochemical cell. A reversible capacity of up to 500 mAh g was attained, corresponding to a five-electron redox exchange, with species ranging from (highest oxidized state) to (lowest oxidized state). This study emphasizes the excellent charge-storage performances of Na MoS for Li- or Na-ion batteries, and enriches the emerging library and knowledge of sulfide phases with mixed anionic and cationic redox properties.

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http://dx.doi.org/10.1002/anie.202004587DOI Listing

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