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

In-operando neutron reflectometry reveals the solid electrolyte interface formation on surface coated silicon based anodes for lithium-ion batteries

Dec 8, 2020, 4:15 PM
25m
Online event

Online event

Talk UM: Materials Science MLZ Users 2020 - Materials Science

Speaker

Simon J. Schaper

Description

Silicon anodes for lithium ion batteries (LIBs) exhibit a high theoretical capacity of 3590 mA h g$^{-1}$ – one magnitude higher than commonly used graphite – but they suffer a large volume expansion of around 300 % during cycling. The formation and composition of the solid electrolyte interface (SEI) in LIBs has a huge impact on the stability and performance of the cell. Coatings of only 10 nm have a large influence on the SEI and therefor on the stability of the silicon based anode, hence also the cell.[1] Static time-of-flight neutron reflectometry (TOF NR) measurements proof the first three cycles sufficient to form the SEI using metallic lithium as counter electrode. Carbon or TiO$_2$ surface coatings on Si$_{85}$Ti$_{15}$ alloy anodes significantly influence the composition and thickness of the SEI. In-operando TOF NR measurements during cycling lead to a better fundamental understanding of the formation and growth of the SEI on these high-performance LIB anodes.

References
(1) Xie, H.; Sayed, S. Y.; Kalisvaart, W. P.; Schaper, S. J.; Müller-Buschbaum, P.; Luber, E. J.; Olsen, B. C.; Haese, M.; Buriak, J. M. Adhesion and Surface Layers on Silicon Anodes Suppress Formation of c -Li 3.75 Si and Solid-Electrolyte Interphase. ACS Appl. Energy Mater. 2020, 3, 1609–1616.

Primary authors

Simon J. Schaper Dr Hezhen Xie Tobias Widmann (TU München, Physik Department, LS Funktionelle Materialien) Lucas Kreuzer (TU München, Physik Department, E13) Martin Haese (Helmholtz-Zentrum Geesthacht) Gaetano Mangiapia (German Engineering Materials Science Centre (GEMS) am Heinz Maier-Leibnitz Zentrum (MLZ)) Prof. Jillian M. Buriak Peter Müller-Buschbaum (TU München, Physik-Department, LS Funktionelle Materialien)

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