Interfacial degradation and mechanical stress interplay in solid state lithium metal batteries. (IMAGE)
Caption
This schematic summarizes the intertwined failure mechanisms at the anode/solid‑electrolyte interface. Mechanical stress arising from the cathode and anode can initiate cracks, while the interface itself is plagued by microstructural imperfections—voids, interphases, and grain boundaries—that concentrate local current densities. These inhomogeneities promote lithium filament (dendrite) growth. Simultaneously, lithium self‑diffusion and creep are depicted as critical, yet often rate‑limiting, processes for maintaining interfacial contact during stripping and plating. The combined effect of these mechanical and interfacial phenomena ultimately dictates the cycling stability and critical current density of all‑solid‑state batteries, underscoring the need for holistic strategies rather than single‑fix solutions.
Credit
Luca Weckelmann, et al.
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License
CC BY-NC-ND