电解质
阳极
电化学
钒
材料科学
化学工程
钠离子电池
乙醚
扩散
二硫化钼
无机化学
电极
化学
有机化学
法拉第效率
复合材料
物理化学
工程类
物理
热力学
作者
Lixin Li,Ruiqi Li,Xianqi Cao,Jianwei Bai,Wenjun Dong,Chunhong Zhang
出处
期刊:Small
[Wiley]
日期:2025-04-03
卷期号:21 (21): e2501371-e2501371
被引量:2
标识
DOI:10.1002/smll.202501371
摘要
Abstract Vanadium disulfide (VS 2 ) emerges as a great potential anode material for sodium‐ion batteries (SIBs) owing to its large layer spacing and high specific capacity. However, the severe capacity decay and ambiguous sodium storage mechanism severely impair its merits. Herein, the nano‐micro floral spherical VS 2 is designed and its performance enhancement mechanism in ether‐based electrolyte is deciphered. The VS 2 anode in ether‐based electrolyte undergoes multiple sodium storage mechanisms, involving a traditional reaction of VS 2 ↔NaVS 2 ↔Na 2 S and a unique reaction of Na 2 S↔Na 2 S x (2 < x <8) ↔S 8 facilitated by the Cu collector. Meanwhile, multiple reactions trigger decomposition‐reassembly of the original structure to form the hierarchical porous framework that mitigates the stress generated by volume changes. Notably, molecular dynamics simulations and electrochemical measurements indicate that the ether‐based electrolyte not only facilitates Na + de‐solvation and diffusion, but also endows the VS 2 electrode with speedy Na + diffusion kinetics. Consequently, the VS 2 electrode in ether‐based electrolyte demonstrates an outstanding reversible capacity of 655.8 mAh g −1 after 900 cycles at ultra‐high 20 A g −1 . In addition, the assembled Na 3 V 2 (PO 4 ) 3 //VS 2 full battery achieves superior cycling stability with an average capacity decayed rate of only 0.069% per cycle. This work can provide precious insights into the development of advanced metal‐sulfide anode materials.
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