A weakly coordinating-intervention strategy for modulating Na+ solvation sheathes and constructing robust interphase in sodium-metal batteries.
Nat Commun
; 15(1): 6292, 2024 Jul 26.
Article
em En
| MEDLINE
| ID: mdl-39060294
ABSTRACT
Constructing powerful anode/cathode interphases by modulate ion solvation structure is the principle of electrolyte design. However, the methodological and theoretical design principles of electrolyte/solvation structure and their effect on electrochemical performance are still vague. Here, we propose a cationic weakly coordinating-intervention strategy for modulating the Na+ solvation sheathes and constructing robust anode/cathode interphases in sodium-metal batteries. Unlike the local highly concentrated electrolytes, 1,2-difluorobenzene can weakly coordinate with Na+ thus transforming the solvation structure into Na+-anion-incorporated structures and strengthening anode/cathode interphases formation by combining with salt decomposition. Furthermore, the correlations between the electrode interface properties and solvation structure are revealed, which can be tuned by the weakly coordination. Ultimately, the modulated electrolyte achieves 97.5% Coulombic efficiency for 600 cycles in NaâCu cells at 1 mA cm-2 and a beneficial lifetime (2500 h) in NaâNa cells. Meanwhile, NaâPB cells have achieved long-term operation at 4.8 V, along with operation at wide temperatures.
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MEDLINE
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En
Ano de publicação:
2024
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Article