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Coupling of Stack Pressure and Interface Contact Dictates SEI Stability in Li-Metal Solid-State Batteries
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DOI：10.1016/j.actamat.2026.122327.png)
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Abstract
En 中文
The stability of the solid-electrolyte interphase (SEI) remains a central barrier to the practical implementation of lithium-metal all-solid-state batteries (Li-ASSBs). Yet, its dynamic failure pathways under coupled electrochemo-mechanical conditions are not fully understood. Existing models often neglect how stack pressure and interfacial contact jointly regulate current distribution, stress localization, and SEI degradation. Here, we develop an electrochemo-mechanical model that resolves SEI failure driven by the interplay of mechanical constraints and contact heterogeneity. Spatially resolved stress and damage fields reveal that insufficient contact leads to strong current localization, resulting in nonuniform Li deposition and stress concentration. A key finding is a volcano-type dependence of the SEI failure ratio on stack pressure: moderate pressures homogenize mechanical constraints and reduce peak stresses, whereas excessive pressures accelerate internal stress buildup and damage. Integrating these effects, we construct a phase-stability map identifying an SEI stability window at high interfacial contact (>0.6) and moderate stack pressure (1-5 MPa). This framework provides a quantitative mechanistic interpretation of pressure-dependent SEI damage trends reported in the literature. Overall, this work offers fundamentally new insights into the electrochemo-mechanical origins of SEI failure and provides a mechanistic basis for improving interfacial stability in next-generation Li-ASSBs.
Keywords:
SEI stability
Stack pressure
Interface contact
Electrochemo-mechanical model
Lithium-metal batteries
Journal
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9.3
Papers:
2.0W
Citations:
12.9W
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Cited Papers