溶剂化
电解质
法拉第效率
阳极
相间
化学
枝晶(数学)
离子
钠
无机化学
化学工程
电极
物理化学
有机化学
生物
遗传学
数学
工程类
几何学
作者
Huaping Wang,Chunlei Zhu,Jiandong Liu,Shihan Qi,Mingguang Wu,Junda Huang,Daxiong Wu,Jianmin Ma
标识
DOI:10.1002/anie.202208506
摘要
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||Na3 V2 (PO4 )2 O2 F full cells with high Coulombic efficiency (97 %) and capacity retention (91 %) after 200 cycles.
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