Solid-state batteries have seen a dramatic increase in research in recent years because of their ability to address safety challenges associated with flammable liquid electrolytes, and the potential to enable Li metal anodes.  However, all solid-state interfaces present unique challenges, including high interfacial impedances, accommodation of mechanical stresses due to solid-solid interfacial contact, and (electro)chemical instabilities that can evolve during dynamic cycling conditions. Furthermore, a significant challenge facing the scale-up of SSBs is to improve our understanding of processing science needed to enable manufacturing.<br/><br/>To address these challenges, in this talk, I will describe our recent progress in understanding the fundamnetal challenges at solid-state battery interfaces, on both the metal anode and composite cathode sides.  To develop a mechanistic understanding of the dynamic phenomena that occur at these interfaces, we have applied <i>operando</i> video microscopy to study Li metal nucleation and growth and filament propagation on the anode side, and local state-of-charge (SoC) gradients on the cathode.  A key challenge is to improve the homogeneity of the lithium flux accross these electrode-electrolyte interfaces. Therefore, I will describe strategies to engineer these interfaces through nanoscale coatings and engineering the interfacial microstructure.  Finally, I will conclude with a future perspective on remaining challenges facing the field.

Interfacial engineering of solid-state batteries

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