Reversible Magnesium Intercalation into a Layered Oxyfluoride Cathode

Jared T. Incorvati, Liwen F. Wan, Baris Key, Dehua Zhou, Chen Liao, Lindsay Fuoco, Michael Holland, Hao Wang, David Prendergast, Kenneth R. Poeppelmeier, John T. Vaughey

Research output: Contribution to journalArticle

39 Citations (Scopus)

Abstract

Experiments have identified several Mg battery cathode material failure mechanisms are attributable to the ease of loss of oxygen (oxide) from the host lattice. Powder X-ray diffraction (PXRD) diffractograms of the as synthesized MoO2.8F0.2 were indexed on the basis of an orthorhombic cell. Similar cycling capacities were found for 0.2 M Mg(TFSI)2 and Mg(Triflate)2 in either PC, diglyme or dimethylformamide. The only exception noted was cells based on acetonitrile, as they showed significant cycling inefficiencies and poor cycling symptomatic of solvent stability issues. In addition to the PXRD and electrochemical studies, we utilized 25Mg MAS NMR spectroscopy on the discharged cathode samples to get a better understanding of the Mg environment in the host lattice. The results suggest no coordination changes for lattice fluorines such as formation of MgF2 upon magnetization. No intercalation of protons or solvent species was detected via 1H MAS NMR.

Original languageEnglish
Pages (from-to)17-20
Number of pages4
JournalChemistry of Materials
Volume28
Issue number1
DOIs
Publication statusPublished - 2016

ASJC Scopus subject areas

  • Materials Chemistry
  • Chemical Engineering(all)
  • Chemistry(all)

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    Incorvati, J. T., Wan, L. F., Key, B., Zhou, D., Liao, C., Fuoco, L., Holland, M., Wang, H., Prendergast, D., Poeppelmeier, K. R., & Vaughey, J. T. (2016). Reversible Magnesium Intercalation into a Layered Oxyfluoride Cathode. Chemistry of Materials, 28(1), 17-20. https://doi.org/10.1021/acs.chemmater.5b02746