Proceedings of Materials for Sustainable Development Conference (MAT-SUS) (NFM22)
DOI: https://doi.org/10.29363/nanoge.nfm.2022.030
Publication date: 11th July 2022
Solid-state batteries (SSBs) offer the opportunity to leverage energy dense metallic anodes and high voltage cathodes to achieve safe, durable, and affordable secondary energy storage systems1-3. However, the intrinsic thermodynamic, electrochemical and mechanical instabilities at the buried interfaces limits their performance. Unfavorable electro-chemo-mechanical dynamics can contribute to non-optimal material utilization, mechanical degradation, and poor ion transport. These mechanisms occur at various time- and length- scales and are not fully understood. Lithium metal anodes undergo a lithium deposition reaction which involves the reduction reaction of Li/Li+, and a lithium stripping reaction which involves the oxidation of surface Li atoms. Deposition processes are surface driven mechanisms and have been widely studied in order to understand dendrite formation. Stripping processes are sub-surface driven mechanisms and involve charge transfer at the interface between lithium and the solid electrolyte (Li|SE). Li stripping can alter the morphology and structure of the lithium metal interface and affect the subsequent deposition process. Non-uniform stripping can lead to sub-surface/interfacial void formation and decrease interfacial contact area between the Li anode and solid electrolyte. Smaller interfacial surface area can lead to high local current densities and decrease the cells threshold for dendrite formation (cell failure). While there are numerous theoretical studies that provide mechanistic hypotheses for pore formation, directly probing lithium stripping is challenging because the phenomena of interest occurs at buried interfaces. Multi-scale characterization of these materials and their electro-chemo-mechanical responses are pivotal towards engineering solid electrolytes for high power and energy applications. Herein, we combine bench top experiments with synchrotron techniques to resolve chemo-mechanics across multiple length scales which impact electrodeposition and dissolution mechanisms (grain, pore, interface).
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Previously nanoGe Spring Meeting (NSM) and nanoGe Fall Meeting (NFM), MATSUS is a multiple symposia conference focused on a broad set of topics of advanced materials preparation, their fundamental properties, and their applications, in fields such as renewable energy, photovoltaics, lighting, semiconductor quantum dots, 2-D materials synthesis, charge carriers dynamics, microscopy and spectroscopy semiconductors fundamentals, etc.
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