Nitrogen-Vacancy-Rich VN Clusters Embedded in Carbon Matrix for High-Performance Zinc Ion Batteries

被引:9
作者
Bai, Youcun [1 ]
Luo, Liang [2 ]
Song, Wenliang [3 ]
Man, Shuaishuai [4 ]
Zhang, Heng [1 ]
Li, Chang Ming [1 ]
机构
[1] Suzhou Univ Sci & Technol, Inst Mat Sci & Devices, Sch Mat Sci & Engn, Suzhou 215011, Peoples R China
[2] Chongqing Univ, Sch Chem & Chem Engn, Chongqing 401331, Peoples R China
[3] Univ Shanghai Sci & Technol, Sch Mat & Chem, Shanghai 200093, Peoples R China
[4] Jiangnan Univ, Sch Environm & Ecol, Wuxi 214122, Peoples R China
关键词
aqueous zinc ion battery; kinetics; nitrogen vacancies; quasi-solid-state battery; VN clusters; LITHIUM STORAGE;
D O I
10.1002/advs.202308668
中图分类号
O6 [化学];
学科分类号
0703 ;
摘要
Vanadium nitride (VN) is a potential cathode material with high capacity and high energy density for aqueous zinc batteries (AZIBs). However, the slow kinetics resulting from the strong electrostatic interaction of the electrode materials with zinc ions is a major challenge for fast storage. Here, VN clusters with nitrogen-vacancy embedded in carbon (C) (Nv-VN/C-SS-2) are prepared for the first time to improve the slow reaction kinetics. The nitrogen vacancies can effectively accelerate the reaction kinetics, reduce the electrochemical polarization, and improve the performance. The density functional theory (DFT) calculations also prove that the rapid adsorption and desorption of zinc ions on Nv-VN/C-SS-2 can release more electrons to the delocalized electron cloud of the material, thus adding more active sites. The Nv-VN/C-SS-2 exhibits a specific capacity and outstanding cycle life. Meanwhile, the quasi-solid-state battery exhibits a high capacity of 186.5 mAh g-1, ultra-high energy density of 278.9 Wh kg-1, and a high power density of 2375.1 W kg-1 at 2.5 A g-1, showing excellent electrochemical performance. This work provides a meaningful reference value for improving the comprehensive electrochemical performance of VN through interface engineering. Vanadium nitride clusters with nitrogen-vacancy embedded in carbon (Nv-VN/C-SS-2) are prepared for the first time. The nitrogen vacancies promote faster reaction kinetics and provide more active sites, and the carbon matrix improves the conductivity and effectively ensures the activity of the VN cluster. So, Nv-VN/C-SS-2 exhibits high specific capacity, excellent rate capability, and satisfactory cycle stability. image
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页数:11
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