阳极
材料科学
钠
离子
铜
退火(玻璃)
化学工程
化学物理
纳米技术
冶金
复合材料
化学
电极
物理化学
有机化学
工程类
作者
Zhihao Wang,Yongyi Lu,Guangdi Zhang,Lanping Quan,Mingzu Liu,Haimei Liu,Yonggang Wang
出处
期刊:Small
[Wiley]
日期:2024-03-01
被引量:2
标识
DOI:10.1002/smll.202310518
摘要
Abstract Due to their significant capacity and reliable reversibility, transition metal sulphides (TMSs) have received attention as potential anode materials for sodium‐ion batteries (SIBs). Nonetheless, a prevalent challenge with TMSs lies in their significant volume expansion and sluggish kinetics, impeding their capacity for rapid and enduring Na + storage. Herein, a Cu 1.96 S@NC nanodisc material enriched with copper vacancies is synthesised via a hydrothermal and annealing procedure. Density functional theory (DFT) calculations reveal that the incorporation of copper vacancies significantly boosts electrical conductivity by reducing the energy barrier for ion diffusion, thereby promoting efficient electron/ion transport. Moreover, the presence of copper vacancies creates ample active sites for the integration of sodium ions, streamlines charge transfer, boosts electronic conductivity, and, ultimately, significantly enhances the overall performance of SIBs. This novel anode material, Cu 1.96 S@NC, demonstrates a reversible capacity of 339 mAh g −1 after 2000 cycles at a rate of 5 A g −1 . In addition, it maintains a noteworthy reversible capacity of 314 mAh g −1 with an exceptional capacity retention of 96% even after 2000 cycles at 20 A g −1 . The results demonstrate that creating cationic vacancies is a highly effective strategy for engineering anode materials with high capacity and rapid reactivity.
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