their electric field increases aaracFng more Li ions from the electrolyte, forming a rough and porous Li film. This process is more pronounced by increasing electroplaFng current density. The excessive growth of irregular Li structures can lead to growth of Li whiskers dubbed "dendrites" . The rough and irregular metallic Li film has a high surface area in contact with the liquid organic electrolyte. Since Li metal can react with the organic solvents present in the electrolyte forming a well-known solid-electrolyte interface (SEI), the reacFon leads to acFve Li loss which ulFmately decreases the Coulombic efficiency. Furthermore, the needlelike dendrites can fall off the metallic Li film resulFng in so-called "dead lithium" leading to further capacity loss. Even worse, extreme dendrite growth can pierce through the separator leading to a short-circuit of the cell and possibly a fire . Drvarič Talian et al. employed a transiFon line model describing the impedance response of metallic Li in contact with the electrolyte to study the dynamics of surface processes upon cycling. In this work, dendrites are divided into "live porous lithium" containing acFve lithium covered with SEI on the surface, and "dead porous lithium" at the electrolyte side containing passivated lithium consisFng of SEI-like components electronically and ionically disconnected from the bulk acFve lithium. It is shown that as the thickness of dead lithium increases and the electrolyte dries out, the overall resistance of a cell increases significantly, which is a consequence of extensive lithium passivaFon.