Operando Transmission Electron Microscopy Study of All-Solid-State Battery Interface
Redistribution of Lithium among Interconnected Particles
S Basak (TU Delft - RST/Storage of Electrochemical Energy, Forschungszentrum Jülich)
Vadim Migunov (Forschungszentrum Jülich)
Q. Lee (TU Delft - Applied Sciences)
S Ganapathy (TU Delft - RID/TS/Instrumenten groep)
Ashwin Vijay (Student TU Delft)
F. G.B. Ooms (TU Delft - RST/Technici Pool)
Marnix Wagemaker (TU Delft - RST/Storage of Electrochemical Energy)
E. M. Kelder (TU Delft - RST/Storage of Electrochemical Energy)
Violetta Arszelewska (TU Delft - RST/Storage of Electrochemical Energy)
G.B. Cavadini (External organisation)
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Abstract
With operando transmission electron microscopy visualizing the solid-solid electrode-electrolyte interface of silicon active particles and lithium oxide solid electrolyte as a model system, we show that (de)lithiation (battery cycling) does not require all particles to be in direct contact with electrolytes across length scales of a few hundred nanometers. A facile lithium redistribution that occurs between interconnected active particles indicates that lithium does not necessarily become isolated in individual particles due to loss of a direct contact. Our results have implications for the design of all-solid-state battery electrodes with improved capacity retention and cyclability. ©
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