Interfacial issues are believed to be a key issue challenging the long-time operation of solid-state batteries. In particular on the anode side, where the use of metallic lithium will be a requirement to achieve high energy density, understanding plating morphology and the ability for lithium to penetrate and grow into hard solid electrolytes has been challenging. Using modeling that integrates electrolyte transport with the mechanical behavior of the electrolyte and metallic lithium we show that the ability of lithium to grow through a solid conductor depends on just a few intrinsic materials parameters, which can be used to design more dendrite resistant electrolytes. We also delineate the particular conditions under which electronic conductivity can lead to lithium deposition in the conductor. On the cathode side the lack of high voltage stability of solid electrolytes and coating materials is the main driver for impedance growth. Using basic chemical principles, similar to those used to make high voltage cathodes, one can design coating materials that remain intact even for high voltage charging. We belief that the development of more quantitative guidelines for interfacial stability is important for advancing the solid-state battery field.
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