Dec 8 – 10, 2020 Online only
Online event
Europe/Berlin timezone

Lithium Quantification in Lithium-Ion Batteries Using Operando Neutron Depth Profiling

Dec 8, 2020, 5:35 PM
25m
Online event

Online event

Talk UM: Materials Science MLZ Users 2020 - Materials Science

Speaker

Fabian Linsenmann (Chair of Technical Electrochemistry, Department of Chemistry and Catalysis Research Center, Technical University of Munich)

Description

Commercial Lithium-Ion Battery (LIB) cells are mostly based on graphite as anode material. During the first inter¬calation of Li into graphite, the electrolyte gets reduced at the anode, forming a nm-thick surface layer, the so-called solid electrolyte interphase (SEI). The SEI stops further electrolyte reduction but consumes Li during its formation. Neutron depth profiling (NDP) is a non-destructive technique and a suitable tool to measure Li concentrations as a function of depth. When irradiating the sample with a cold neutron beam, 6Li nuclides emit charged particles after neutron capture. The residual energy and the signal rate of the emitted 3H particles are correlated to depth and amount of Li. Thus, SEI growth and Li (de )intercalation in graphite anodes can be studied up to a depth of ca. 30 µm. Here, we present operando NDP data for the first charge/discharge cycle of a graphite anode vs. a LiFePO4 cathode, using a custom-designed coin cell casing with 0.5 mm diameter holes which are sealed with a 7.5 µm Kapton window. We will demonstrate that the cycling performance of the operando cell is comparable to a standard laboratory cell, show that it was possible to quantitatively track the Li concentration across the graphite electrode during cycling, and thus to correlate the amount of Li in the SEI layer with the first cycle irreversible capacity.1

1 Linsenmann, Trunk, Rapp, Werner, Gernhäuser, Gilles, Märkisch, Revay, Gasteiger, J. Elec. Soc. 167 (2020) 100554.

Primary author

Fabian Linsenmann (Chair of Technical Electrochemistry, Department of Chemistry and Catalysis Research Center, Technical University of Munich)

Co-authors

Philip Rapp (Chair of Technical Electrochemistry, Department of Chemistry and Catalysis Research Center, Technical University of Munich) Lukas Werner (Particle Physics at Low Energies, Physics Department, Technical University of Munich) Roman Gernhäuser (Particle Physics at Low Energies, Physics Department, Technical University of Munich) Markus Trunk (Particle Physics at Low Energies, Physics Department, Technical University of Munich) Ralph Gilles (Heinz Maier-Leibnitz-Zentrum, Technical University of Munich) Prof. Bastian Märkisch (Particle Physics at Low Energies, Physics Department, Technical University of Munich) Zsolt Revay (Heinz Maier-Leibnitz-Zentrum, Technical University of Munich) Prof. Hubert Gasteiger (Chair of Technical Electrochemistry, Department of Chemistry and Catalysis Research Center)

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