fig7

Figure 7. Inorganic electrolytes regulate SEI for dendrite-inhibited SMAs. (A) Schematic of the bilayer β”-Al₂O₃ electrolyte structure. Reproduced with permission from^[50]. Copyright 2021, Elsevier. (B) Impact of heat-treatment temperature on interfacial resistance at room temperature. (left) Schematic of Na/Na-β”-alumina/Na cell and equivalent circuit for fitting the impedance spectra. (middle) Representative Nyquist plots for the different heat-treatment temperatures. Markers represent experimental data and lines represent the fitted data. (right) Interfacial resistance according to heat-treatment temperature. Reproduced with permission from^[122]. Copyright 2020, Wiley-VCH. (C) Crystal structure view of Na_3.4Mg_0.1Zr_1.9Si_2.2P_0.8O₁₂. Reproduced with permission from^[120]. Copyright 2021, Elsevier. (D) Diagram of the ultrasound solid welding method. Reproduced with permission from^[126]. Copyright 2021, Nature Publishing Group. (E) (left) SEM-EDS mapping images of NZSP-0.2Mg against sodium metal after cycling. (right) Confined Na plating at the interface of Na/NZSP-0.2Mg. Reproduced with permission from^[127]. Copyright 2021, Wiley-VCH. (F) (top) Diagram of the reactive Na/sulfide-based SSEs interface and stable Na@alucone/sulfide-based SSEs interface. Top-side SEM of the cycled Na|Na₃SbS₄|Na using (bottom left) bare Na and (bottom right) Na@mld 150 C electrodes. Reproduced with permission from^[129]. Copyright 2021, Wiley-VCH. SEI: Solid electrolyte interphase; SMAs: sodium metal anodes.