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Mechanochemically Enabled Metastable Niobium Tungsten Oxides.

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Mechanochemistry enables new metastable niobium tungsten oxides (NbWOs) with disordered structures. These materials exhibit a unique conversion to a cation-disordered cubic phase when used as lithium-ion battery anodes.

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Area of Science:

  • Solid-state chemistry
  • Materials science
  • Electrochemistry

Background:

  • Metastable compounds significantly expand accessible material compositions.
  • Mechanochemistry is effective for synthesizing cation-disordered materials, particularly rock-salt structures.
  • Synthesis of metastable non-close-packed structures remains underexplored.

Purpose of the Study:

  • To develop a new series of metastable niobium tungsten oxides (NbWOs).
  • To investigate the synthesis of cation-disordered NbWO structures.
  • To explore the structural transformations of NbWOs during electrochemical applications.

Main Methods:

  • Mechanochemical synthesis of metastable niobium tungsten oxides.
  • Physicochemical characterization including diffraction, electronic, and vibrational spectroscopy.
  • Electrochemical testing as a lithium-ion battery anode.

Main Results:

  • Successful synthesis of a novel metastable NbWO with a fully cation-disordered structure.
  • Observed transformation of metastable NbWO to a cation-disordered cubic structure during Li-ion battery anode operation.
  • Demonstration of a non-close-packed to close-packed structural conversion.

Conclusions:

  • Metastable NbWOs can be synthesized, including fully cation-disordered variants.
  • NbWOs undergo a unique structural conversion when used as Li-ion battery anodes.
  • Identified key features of cation disorder and proposed future research directions.