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Batteries 2022, 8, 157 tions, it was observed that the Na metal deposit exhibited a needle-like shape after depo- sition in 1 M NaPF6-DME electrolyte. After the introduction of Li+ additives, the Na metal showed a smooth morphology deposition, which was extremely disparaged from the nee- dle-like Na dendrites. This result validated the resisted Na dendritic growth d6uoef 2t5o the electrostatic shield effect and enhanced electrolyte stability after introducing Li+ additives. Figure 2. (a) C 1 s, F 1 s, and N 1 s XPS spectra of the Na metal anode surface during the initial Figure 2. (a) C 1 s, F 1 s, and N 1 s XPS spectra of the Na metal anode surface during the initial Na Na plating. Reproduced with permission from Reference [70] Copyright 2018, American Chemical plating. Reproduced with permission from Reference [70] Copyright 2018, American Chemical So- Society. (b) The comparison of LUMO energy levels decreases and binding energy of ion–DME ciety. (b) The comparison of LUMO energy levels decreases and binding energy of ion–DME com- complexes. Reproduced with permission from Reference [71] Copyright 2020, Elsevier. plexes. Reproduced with permission from Reference [71] Copyright 2020, Elsevier. From the aforementioned discussion, it is found that the increase in inorganic con- From the aforementioned discussion, it is found that the increase in inorganic con- stituents, especially NaF could improve the stability of the SEI layer, leading to the elec- stituents, especially NaF could improve the stability of the SEI layer, leading to the elec- trochemical enchantment performance for NMBs. Based on this result, the F-containing trochemical enchantment performance for NMBs. Based on this result, the F-containing ingredients were also utilized as electrolyte additives in NMBs. Fang et al. utilized SbF3 as ingredients were also utilized as electrolyte additives in NMBs. Fang et al. utilized SbF3 an electrolyte additive in 4 M NaFSI-DME-based electrolytes for NMBs and found that the asSabnFelaedcdtritoivlyetceoaudldibtuiviledianb4ilMayeNraSFESIIl-aDyeMr E[7-2b]a. sOendeellaeycetrowlyastecsonfosrtitNutMedBbsyanthdefNoau-nSdb that 3 alloy layer from the Sb-ion electrolyte. Another layer was derived from the F ion of the SbF3PDF Image | Recent Development for Sodium Metal Batteries
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