American Chemical Society
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Operando Transmission Electron Microscopy Study of All-Solid-State Battery Interface: Redistribution of Lithium among Interconnected Particles

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posted on 2020-05-15, 22:06 authored by Shibabrata Basak, Vadim Migunov, Amir H. Tavabi, Chandramohan George, Qing Lee, Paolo Rosi, Violetta Arszelewska, Swapna Ganapathy, Ashwin Vijay, Frans Ooms, Roland Schierholz, Hermann Tempel, Hans Kungl, Joachim Mayer, Rafal E. Dunin-Borkowski, Rüdiger-A. Eichel, Marnix Wagemaker, Erik M. Kelder
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.