Using fracture mechanics, we quantify the impact of stack pressure and in-plane stresses on dendrite trajectory, chart the residual stresses required to prevent short-circuit failure, and propose design approaches to achieve such stresses. For sufficient loading, this deflection averts cell failure. Operando microscopy reveals marked deflection in the dendrite growth trajectory at the onset of compressive loading. Here, we investigate this hypothesis by dynamically applying mechanical loads to growing dendrites in Li 6. If internal mechanical forces drive failure, superimposing a compressive load that counters internal stress may mitigate dendrite penetration. Whether dendrites are driven by mechanical failure or electrochemical degradation of solid electrolytes remains an open question. Metal-dendrite penetration is a mode of electrolyte failure that threatens the viability of metal-anode-based solid-state batteries.
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