锌
无机化学
材料科学
插层(化学)
离子
钒
硝酸锌
扩散
兴奋剂
水溶液
化学工程
化学
物理化学
热力学
冶金
光电子学
有机化学
工程类
物理
作者
Xin Gu,Juntao Wang,Xiaobin Zhao,Xin Jin,Yuzhe Jiang,Pengcheng Dai,Nana Wang,Zhongchao Bai,Mengdi Zhang,Mingbo Wu
标识
DOI:10.1016/j.jechem.2023.05.043
摘要
Vanadium-based compounds with high theoretical capacities and relatively stable crystal structures are potential cathodes for aqueous zinc-ion batteries (AZIBs). Nevertheless, their low electronic conductivity and sluggish zinc-ion diffusion kinetics in the crystal lattice are greatly obstructing their practical application. Herein, a general and simple nitrogen doping strategy is proposed to construct nitrogen-doped VO2(B) nanobelts (denoted as VO2-N) by the ammonia heat treatment. Compared with pure VO2(B), VO2-N shows an expanded lattice, reduced grain size, and disordered structure, which facilitates ion transport, provides additional ion storage sites, and improves structural durability, thus presenting much-enhanced zinc-ion storage performance. Density functional theory calculations demonstrate that nitrogen doping in VO2(B) improves its electronic properties and reduces the zinc-ion diffusion barrier. The optimal VO2-N400 electrode exhibits a high specific capacity of 373.7 mA h g−1 after 100 cycles at 0.1 A g−1 and stable cycling performance after 2000 cycles at 5 A g−1. The zinc-ion storage mechanism of VO2-N is identified as a typical intercalation/de-intercalation process.
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