Article
Pressure-Driven Interface Evolution in Solid-State Lithium Metal Batteries

https://doi.org/10.1016/j.xcrp.2019.100012Get rights and content
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Highlights

  • A simple technique to determine the absolute Li-solid electrolyte interface resistance

  • A method to predict regions of discharge instability

  • A suggestion that the preferred stack pressure should be at least 20 MPa

  • Quantitative determinations of effective yield strength of 16 ± 2 MPa for Li

Summary

The development of solid-state batteries has encountered a number of problems due to the complex interfacial contact conditions between lithium (Li) metal and solid electrolytes (SEs). Recent experiments have shown that applying stack pressure can ameliorate these problems. Here, we report a multi-scale three-dimensional time-dependent contact model for describing the Li-SE interface evolution under stack pressure. Our simulation considers the surface roughness of the Li and SEs, Li elastoplasticity, Li creep, and the Li metal plating/stripping process. Consistency between the very recent experiments from two different research groups indicates effective yield strength of the Li used in those experiments of 16 ± 2 MPa. We suggest that the preferred stack pressure be at least 20 MPa to maintain a relatively small interface resistance while reducing void volume.

Keywords

Li metal
solid electrolyte
creep
interface resistance
contact mechanics
multi-scale
stack pressure
surface roughness
void

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