Valence Determination of Manganese in Battery Cathode Materials by High-Resolution Mn Kα1 Spectra

Valence Determination of Manganese in Battery Cathode Materials by High-Resolution Mn Kα1 Spectra

High-resolution the Mn Kα1 X-ray fluorescence spectra (HRXRF) were measured for a variety of manganese compounds, the oxidation number (valence) of which was from II to VII. Plots of the valence against the full width at half maximum (FWHM) and the chemical shift of the Kα1 X-ray fluorescence spectr...

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Bibliographic Details
Published in:Analytical Sciences Vol. 21; no. 7; pp. 861 - 864
Main Authors: KONISHI, Tokuzo, TSUBATA, Toshio, OKU, Masaoki, TODOROV, Yanko M., YOSHIO, Masaki
Format: Journal Article
Language:English
Published: The Japan Society for Analytical Chemistry 2005
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Summary:High-resolution the Mn Kα1 X-ray fluorescence spectra (HRXRF) were measured for a variety of manganese compounds, the oxidation number (valence) of which was from II to VII. Plots of the valence against the full width at half maximum (FWHM) and the chemical shift of the Kα1 X-ray fluorescence spectra give a curve and a liniar relation, respectively. The coefficient of correlation (R2) for the latter plot was 0.989 between valency II and VII. More excellent linearlity from III to IV was obtained with R2 = 0.995, which enabled us to determine the oxidation number of manganese atom in a nickel ion doped spinel structure, LiMn2O4 (LiNixMn2-xO4, with 0.2 < x < 0.42). From the valence of manganese ion obtained from HRXRF, the oxidation number of nickel ion is concluded to be divalent.
ISSN:0910-6340
1348-2246
DOI:10.2116/analsci.21.861