Lithium Alanates as Negative Electrodes in Lithium-Ion Batteries

TitleLithium Alanates as Negative Electrodes in Lithium-Ion Batteries
Publication TypeArticolo su Rivista peer-reviewed
Year of Publication2015
AuthorsSilvestri, L., Forgia S., Farina L., Meggiolaro D., Panero S., LaBarbera A., Brutti S., and Reale P.
KeywordsAlanates, Attenuated total reflectance Fourier transform infrared spectroscopy, Characterization, Computation theory, Computational data, Conversion reactions, Density functional theory, Digital storage, Electric batteries, Electrochemical features, Electrodes, Energy storage, Fourier transform infrared spectroscopy, High resolution transmission electron microscopy, Hydrides, Lithium, Lithium alloys, Lithium cells, Lithium compounds, Lithium-ion batteries, Mechanochemical treatment, Secondary batteries, Synchrotron radiation, Synchrotron radiation diffractions, Time varying systems, Transmission electron microscopy, X ray diffraction

Hydride conversion reactions have been recently proposed and verified experimentally on simple binary and ternary H-containing materials. Herein, we show for the first time the incorporation of lithium alanates, that is, LiAlH4 and Li3AlH6, as active materials in negative electrodes in rechargeable lithium cells. Samples were prepared by mechanochemical treatment. Characterization of the samples was performed by X-ray diffraction, transmission electron microscopy, and Fourier-transform infrared spectroscopy. Analysis of the electrochemical features of the conversion process was performed by potentiodynamic cycling with galvanostatic acceleration in close comparison with computational data obtained by density functional theory with the use of pseudopotentials and planewaves. The occurrence of the conversion reactions was proved by exsitu synchrotron radiation diffraction experiments. As a final point, the stability of the electrolyte/electrode interface over time was evaluated by impendence spectroscopy and attenuated total reflectance Fourier-transform infrared spectroscopy. © 2015 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.


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