期刊
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
卷 61, 期 38, 页码 -出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/anie.202208506
关键词
4-Acetylpyridine; Sodium Fluoride; Sodium-Metal Anodes; Solid Electrolyte Interphase; Solvation Sheath Regulation
资金
- National Natural Science Foundation of China [51971090, U21A20311, (PO4)2O]
By employing an additive strategy, the decomposition of PF6- and the formation of a stable NaF-rich solid electrolyte interphase (SEI) were achieved, resulting in the inhibition of dendrite growth on high-capacity sodium (Na) anodes. The use of electrolytes containing 4-acetylpyridine (4-APD) enabled excellent cycling performance and stability.
High-capacity sodium (Na) anodes suffer from dendrite growth due to the high reactivity, which can be overcome through inducing a stable NaF-rich solid electrolyte interphase (SEI). Herein, we propose an additive strategy for realizing the anion-enriched structure of Na+ solvation to obtain a NaF-rich SEI. The electron-withdrawing acetyl group in 4-acetylpyridine (4-APD) increases the coordination number of PF6- in the Na+ solvation sheath to facilitate PF6- to decompose into NaF. Thus, the NaF-rich SEI with high mechanical stability and interfacial energy is formed to repress the growth of Na dendrites. With the 4-APD-contained electrolyte, the symmetric Na||Na cells show excellent cycling performance over 360 h at 1.0 mA cm(-2). Meanwhile, excellent stability is also achieved for Na||Na3V2(PO4)(2)O2F full cells with high Coulombic efficiency (97 %) and capacity retention (91 %) after 200 cycles.
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