Solid Electrolyte Interphase Evolution on Lithium Metal in Contact with Glyme-Based Electrolytes.

The formation of a stable solid electrolyte interphase (SEI) is a prerogative for functional lithium metal batteries. Herein, the formation and evolution of such SEI in contact with glyme-based electrolytes is investigated under open circuit voltage and several constant current cycles. An important conclusion of the study is that Lix Sy species are nonbeneficial SEI components, compared to the Li3 N counterpart. In addition, chemical (X-ray photoelectron spectroscopy, XPS) and electrochemical (impedance spectroscopy) evolution of SEI under galvanostatic conditions are comprehensively tracked.