Formation of NaF-Rich Solid Electrolyte Interphase on Na Anode through Additive-Induced Anion-Enriched Structure of Na+ Solvation

被引：95

作者：

Wang, Huaping ^{[1
]}

Zhu, Chunlei ^{[1
]}

Liu, Jiandong ^{[1
]}

Qi, Shihan ^{[1
]}

Wu, Mingguang ^{[1
]}

Huang, Junda ^{[1
]}

Wu, Daxiong ^{[1
]}

Ma, Jianmin ^{[1
]}

机构：

[1] Hunan Univ, Sch Phys & Elect, Changsha 410082, Peoples R China

来源：

ANGEWANDTE CHEMIE-INTERNATIONAL EDITION | 2022年 / 61卷 / 38期

基金：

中国国家自然科学基金;

关键词：

4-Acetylpyridine; Sodium Fluoride; Sodium-Metal Anodes; Solid Electrolyte Interphase; Solvation Sheath Regulation; METAL ANODES; ION; CHEMISTRY; INTERFACE;

D O I：

10.1002/anie.202208506

中图分类号：

O6 [化学];

学科分类号：

0703 ;

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||Na3V2(PO4)(2)O2F full cells with high Coulombic efficiency (97 %) and capacity retention (91 %) after 200 cycles.

引用

页数：5