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Issue 20, 2013
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Neutron reflectometry studies on the lithiation of amorphous silicon electrodes in lithium-ion batteries

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Abstract

Neutron reflectometry is used to study in situ the intercalation of lithium into amorphous silicon electrodes. The experiments are done using a closed three-electrode electrochemical cell setup. As a working electrode, an about 40 nm thick amorphous silicon layer is used that is deposited on a 1 cm thick quartz substrate coated with palladium as a current collector. The counter electrode and the reference electrode are made of lithium metal. Propylene carbonate with 1 M LiClO4 is used as an electrolyte. The utility of the cell is demonstrated during neutron reflectometry measurements where Li is intercalated at a constant current of 100 μA (7.8 μA cm−2) for different time steps. The results show (a) that the change in Li content in amorphous silicon and the corresponding volume expansion can be monitored, (b) that the formation of the solid electrolyte interphase becomes visible and (c) that an irreversible capacity loss is present.

Graphical abstract: Neutron reflectometry studies on the lithiation of amorphous silicon electrodes in lithium-ion batteries

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Publication details

The article was received on 10 Dec 2012, accepted on 02 Apr 2013 and first published on 03 Apr 2013


Article type: Paper
DOI: 10.1039/C3CP44438D
Citation: Phys. Chem. Chem. Phys., 2013,15, 7777-7784
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    Neutron reflectometry studies on the lithiation of amorphous silicon electrodes in lithium-ion batteries

    B. Jerliu, L. Dörrer, E. Hüger, G. Borchardt, R. Steitz, U. Geckle, V. Oberst, M. Bruns, O. Schneider and H. Schmidt, Phys. Chem. Chem. Phys., 2013, 15, 7777
    DOI: 10.1039/C3CP44438D

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