Single-Source Alkoxide Precursor Approach to Titanium Molybdate, TiMoO<sub>5</sub>, and Its Structure, Electrochemical Properties, and Potential as an Anode Material for Alkali Metal Ion Batteries

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  • Hiroaki Uchiyama
    Department of Molecular Sciences, BioCenter, Swedish University of Agricultural Sciences, Box 7015, SE-750 07 Uppsala, Sweden
  • Dhanya Puthusseri
    Davidson School of Chemical Engineering, Purdue University, West Lafayette, Indiana 47907, United States
  • Jekabs Grins
    Department of Materials and Environmental Chemistry, Stockholm University, SE-106 91 Stockholm, Sweden
  • Daniel Gribble
    Davidson School of Chemical Engineering, Purdue University, West Lafayette, Indiana 47907, United States
  • Gulaim A. Seisenbaeva
    Department of Molecular Sciences, BioCenter, Swedish University of Agricultural Sciences, Box 7015, SE-750 07 Uppsala, Sweden
  • Vilas G. Pol
    Davidson School of Chemical Engineering, Purdue University, West Lafayette, Indiana 47907, United States
  • Vadim G. Kessler
    Department of Molecular Sciences, BioCenter, Swedish University of Agricultural Sciences, Box 7015, SE-750 07 Uppsala, Sweden

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説明

Transition-metal oxide nanostructured materials are potentially attractive alternatives as anodes for Li ion batteries and as photocatalysts. Combining the structural and thermal stability of titanium oxides with the relatively high oxidation potential and charge capacity of molybdenum(VI) oxides was the motivation for a search for approaches to mixed oxides of these two metals. Challenges in traditional synthetic methods for such materials made development of a soft chemistry single-source precursor pathway our priority. A series of bimetallic Ti-Mo alkoxides were produced by reactions of homometallic species in a 1:1 ratio. Thermal solution reduction with subsequent reoxidation by dry air offered in minor yields Ti2Mo2O4(OMe)6(OiPr)6 (1) by the interaction of Ti(OiPr)4 with MoO(OMe)4 and Ti6Mo6O22(OiPr)16(iPrOH)2 (2) by the reaction of Ti(OiPr)4 with MoO(OiPr)4. An attempt to improve the yield of 2 by microhydrolysis, using the addition of stoichiometric amounts of water, resulted in the formation with high yield of a different complex, Mo7Ti7+xO31+x(OiPr)8+2x (3). Controlled thermal decomposition of 1-3 in air resulted in their transformation into the phase TiMoO5 (4) with an orthorhombic structure in space group Pnma, as determined by a Rietveld refinement. The electrochemical characteristics of 4 and its chemical transformation on Li insertion were investigated, showing its potential as a promising anode material for Li ion batteries for the first time. A lower charge capacity and lower stability were observed for its application as an anode for a Na ion battery.

収録刊行物

  • Inorganic Chemistry

    Inorganic Chemistry 60 (6), 3593-3603, 2021-02-22

    American Chemical Society (ACS)

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