Evolving contact mechanics and microstructure formation dynamics of the lithium metal-Li<sub>7</sub>La<sub>3</sub>Zr<sub>2</sub>O<sub>12</sub> interface.
basic_science · Level V
Where this comes from
- Record sourced from PubMed, PMID 34737263.
- Also identified by DOI 10.1038/s41467-021-26632-x and PMC identifier 8569160.
- Licence recorded as CC BY.
- The licence permits redistribution, so the abstract is shown in full and the full text is available from the publisher.
Abstract
The dynamic behavior of the interface between the lithium metal electrode and a solid-state electrolyte plays a critical role in all-solid-state battery performance. The evolution of this interface throughout cycling involves multiscale mechanical and chemical heterogeneity at the micro- and nano-scale. These features are dependent on operating conditions such as current density and stack pressure. Here we report the coupling of operando acoustic transmission measurements with nuclear magnetic resonance spectroscopy and magnetic resonance imaging to correlate changes in interfacial mechanics (such as contact loss and crack formation) with the growth of lithium microstructures during cell cycling. Together, the techniques reveal the chemo-mechanical behavior that governs lithium metal and Li<sub>7</sub>La<sub>3</sub>Zr<sub>2</sub>O<sub>12</sub> interfacial dynamics at various stack pressure regimes and with voltage polarization.