Solid electrolyte interphases (SEI) enable the Li-ion intercalation chemistries to operate reversibly beyond the thermodynamic stability limits of non-aqueous electrolytes. The chemical building blocks of SEI mainly come from solvents decomposition products. Exceptions arise, when salt anion are reduction-labile, or when salt concentration exceeds certain thresholds, where anion starts to participate in the interphasial chemistry.<br/>Through understanding of SEI formation mechanism, Li<sup>+</sup>-solvation sheath structure was identified as a central factor in dictating the assembly and arrangement of SEI precursors at electrode surface. This knowledge provides an effective tool for us to tailor interphasial chemistries, and eventually leads us to extend the efforts into the realm of aqueous electrolytes, where SEI is hitherto unknown. The new class of aqueous electrolytes, with their widened voltage windows &gt; 3.0 V, have opened up a series of new opportunities for advanced electrochemical storage technologies. This talk summarizes our efforts to explore this realm of “uncharted water”.

Manipulating interphases in non-aqueous and aqueous electrolytes

254th National Meeting (2017)

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