Journal article

Publication year: 2015

Pages: 2525-2531

Journal: Chemistry of Materials

Volume number: 27

Issue number: 7

ISSN: 0897-4756

eISSN: 1520-5002

DOI Link: https://doi.org/10.1021/acs.chemmater.5b00119

Publisher: American Chemical Society

Abstract: 
The high-voltage LiNi0.5Mn1.5O4 (LNMO) spinel is a promising material fot high-energy battery applications, degpite problems of Capacity fade. This is clue in Tart to transition metal leaching that produces Chemical and morphological inhomogeneities, Using fast micro-X-ray fluorescence spectroscopy to scan the sample at medium gpatial resolution (500 nm) over millimeter ranges, effects of cycling rate and state-of-charge on the elemental distribution (Ni and Mn) for LiNi0.5Mn1.5O4/carbon composite electrodes in LNMO/Li cells are visualized. Charge distribution is imaged by mapping the Ni oxidation state by acquisition of a stack of elemental maps in the vicinity of the Ni K edge. Our results show significant effects on morphology and elemental distribution, such as formation of elemental hot-spots and material erosion, becoming more pronounced at higher cycling rates. In nickel hot-spots, we observed hampered oxidation of nickel during charging.

Harvard Citation style: Boesenberg, U., Falk, M., Ryan, C., Kirkham, R., Menzel, M., Janek, J., et al. (2015) Correlation between Chemical and Morphological Heterogeneities in LiNi0.5Mn1.5O4 Spinel Composite Electrodes for Lithium-Ion Batteries Determined by Micro-X-ray Fluorescence Analysis, Chemistry of Materials, 27(7), pp. 2525-2531. https://doi.org/10.1021/acs.chemmater.5b00119

APA Citation style: Boesenberg, U., Falk, M., Ryan, C., Kirkham, R., Menzel, M., Janek, J., Fröba, M., Falkenberg, G., & Fittschen, U. (2015). Correlation between Chemical and Morphological Heterogeneities in LiNi0.5Mn1.5O4 Spinel Composite Electrodes for Lithium-Ion Batteries Determined by Micro-X-ray Fluorescence Analysis. Chemistry of Materials. 27(7), 2525-2531. https://doi.org/10.1021/acs.chemmater.5b00119