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Proximity Matters: Interfacial Solvation Dictates Solid Electrolyte Interphase Composition
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DOI：10.1021/acs.nanolett.3c02037.png)
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Abstract
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Thecomposition of the solid electrolyte interphase (SEI) playsan important role in controlling Li-electrolyte reactions,but the underlying cause of SEI composition differences between electrolytesremains unclear. Many studies correlate SEI composition with the bulksolvation of Li ions in the electrolyte, but this correlation doesnot fully capture the interfacial phenomenon of SEI formation. Here,we provide a direct connection between SEI composition and Li-ionsolvation by forming SEIs using polar substrates that modify interfacialsolvation structures. We circumvent the deposition of Li metal byforming the SEI above Li+/Li redox potential. Using theory,we show that an increase in the probability density of anions neara polar substrate increases anion incorporation within the SEI, providinga direct correlation between interfacial solvation and SEI composition.Finally, we use this concept to form stable anion-rich SEIs, resultingin high performance lithium metal batteries.
Keywords:
solid electrolyte interphase formation
interfacialsolvation
lithium metal batteries
atomic layerdeposition
polar substrates
Journal
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9.1
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2.7W
Citations:
16.5W
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