Operando transmission electron microscopy of battery cycling
thickness dependent breaking of TiO2 coating on Si/SiO2 nanoparticles
S Basak (Imperial College London, Forschungszentrum Jülich)
Amir H. Tavabi (Forschungszentrum Jülich)
Krzysztof Dzieciol (Forschungszentrum Jülich)
Vadim Migunov (Forschungszentrum Jülich)
Violetta A. Arszelewska (TU Delft - RST/Storage of Electrochemical Energy)
Hermann Tempel (Forschungszentrum Jülich)
Hans Kungl (Forschungszentrum Jülich)
E.M. Kelder (TU Delft - RST/Storage of Electrochemical Energy)
M. Wagemaker (TU Delft - RST/Storage of Electrochemical Energy)
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Abstract
Conformal coating of silicon (Si) anode particles is a common strategy for improving their mechanical integrity, to mitigate battery capacity fading due to particle volume expansion, which can result in particle crumbling due to lithiation induced strain and excessive solid-electrolyte interface formation. Here, we use operando transmission electron microscopy in an open cell to show that TiO2 coatings on Si/SiO2 particles undergo thickness dependent rupture on battery cycling where thicker coatings crumble more readily than thinner (∼5 nm) coatings, which corroborates the difference in their capacities.
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