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

doi:10.1021/acs.chemmater.5b02746

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

Northwestern University

Research output: Contribution to journal › Article

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 MoO_2.8F_0.2 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 language	English
Pages (from-to)	17-20
Number of pages	4
Journal	Chemistry of Materials
Volume	28
Issue number	1
DOIs	https://doi.org/10.1021/acs.chemmater.5b02746
Publication status	Published - 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

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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.",

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

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AU - Incorvati, Jared T.

AU - Wan, Liwen F.

AU - Key, Baris

AU - Zhou, Dehua

AU - Liao, Chen

AU - Fuoco, Lindsay

AU - Holland, Michael

AU - Wang, Hao

AU - Prendergast, David

AU - Poeppelmeier, Kenneth R.

AU - Vaughey, John T.

PY - 2016

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N2 - 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.

AB - 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.

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