Niobium(V) Oxynitride: Synthesis,Characterization, and Feasibility as Anode Material for Rechargeable Lithium‐Ion Batteries |
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| Authors: | Dr Xiao‐Jun Wang Dr Frank Krumeich Dr Michael Wörle Prof?Dr Reinhard Nesper Dr Laurent Jantsky Prof?Dr Helmer Fjellvåg |
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| Institution: | 1. Laboratory of Inorganic Chemistry, ETH Zürich, Wolfgang‐Pauli‐Strasse 10, 8093 Zürich (Switzerland), Fax: (+41)?44‐632‐1149;2. Department of Chemistry, Centre for Materials Science and Nanotechnology, University of Oslo, FERMiO, 0349 Oslo (Norway) |
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| Abstract: | The decomposition reaction of niobium(V) oxytrichloride ammoniate to the oxynitride of niobium in the 5+ oxidation state was developed in a methodological way. By combining elemental analysis, Rietveld refinements of X‐ray and neutron diffraction data, SEM and TEM, the sample compound was identified as approximately 5 nm‐diameter particles of NbO1.3(1)N0.7(1) crystallizing with baddeleyite‐type structure. The thermal stability of this compound was studied in detail by thermogravimetric/differential thermal analysis and temperature‐dependent X‐ray diffraction. Moreover, the electrochemical uptake and release by the galvanostatic cycling method of pure and carbon‐coated NbO1.3(1)N0.7(1) versus lithium was investigated as an example of an Li‐free transition‐metal oxynitride. The results showed that reversible capacities as high as 250 and 80 A h kg?1 can be reached in voltage ranges of 0.05–3 and 1–3 V, respectively. Furthermore, a plausible mechanism for the charge–discharge reaction is proposed. |
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| Keywords: | electrochemistry nanoparticles niobium oxynitrides solid‐state reactions |
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