fig1

Figure 1. (A) Schematic illustration of the solid electrolyte interphase layer formed on a Li° anode in electrolytes with different lithium salts. Reproduced from Ref.^[28] with permission. Copyright 2018 American Chemical Society. (B) Role of the two salts in SPE-based Li-S batteries. (C) Long-term cycling stability of Li-S cells based on the LiDFTFSI/PEO electrolyte (0.1/0.1 C, after C-rate test, *erratic Coulombic efficiency at around 400th cycle). Figure 1B and C reproduced from Ref.^[39] with permission. Copyright 2019 Cell Press. Optical and scanning electron microscopy images (D) and X-ray photoelectron spectroscopy spectra (E) of lithium deposited onto Cu substrates in LiX/DME (X = TCM or TFSI) LEs. Reproduced from Ref.^[40] with permission. Copyright 2019 Wiley-VCH. (F) Schematic illustration of electrochemical reactions of LiN₃ in lithium-metal batteries. Reproduced from Ref.^[43] with permission. Copyright 2017 Wiley-VCH.