fig10

Figure 10. (A) XPS spectra of Li deposits formed on Cu in Li_X/DME electrolytes; (B) Depth-dependent atomic concentrations (Li, S, F, N) of the Li deposits. Figure 10A and B is reprinted with permission from Ref. [127], Copyright © 2018 American Chemical Society; (C) Multilayer design of the salt-differentiated SPE; (D) Voltage profiles of Li/Li symmetric cells with the salt-differentiated SPE at 0.25 mA·cm^-2 (60 °C). Figure 10C and D is reprinted with permission from Ref. [128], Copyright © 2019 Wiley. XPS: X-ray photoelectron spectroscopy; DME: dimethoxyethane; SPE: solid polymer electrolyte; LiFTFSI: lithium (fluorosulfonyl)(trifluoromethanesulfonyl)imide; LiFSI: lithium bis(fluorosulfonyl)imide; LiTFSI: lithium bis(trifluoromethanesulfonyl)imide; LCO: lithium cobalt oxide; PEO: polyethylene oxide; LiTFPFB: lithium trifluoro(perfluoro-tert-butoxyl)borate; DSM: designed solid-state membrane.