On high-temperature evolution of passivation layer in Li-10 wt % Mg alloy via in situ SEM-EBSD.
basic_science · Level V
Where this comes from
- Record sourced from PubMed, PMID 33298450.
- Also identified by DOI 10.1126/sciadv.abd5708 and PMC identifier 7725460.
- Licence recorded as CC BY-NC.
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Abstract
Li-10 wt % Mg alloy (Li-10 Mg) is used as an anode material for a solid-state battery with excellent electrochemical performance and no evidence of dendrite formation during cycling. Thermal treatment of Li metal during manufacturing improves the interfacial contact between a Li metal electrode and solid electrolyte to achieve an all solid-state battery with increased performance. To understand the properties of the alloy passivation layer, this paper presents the first direct observation of its evolution at elevated temperatures (up to 325°C) by in situ scanning electron microscopy. We found that the morphology of the surface passivation layer was unchanged above the alloy melting point, while the bulk of the material below the surface was melted at the expected melting point, as confirmed by in situ electron backscatter diffraction. In situ heat treatment of Li-based materials could be a key method to improve battery performance.