材料科学
钒
氧化钒
阴极
水溶液
插层(化学)
电化学
X射线光电子能谱
化学工程
扩散
兴奋剂
氧化物
溶解
无机化学
电极
冶金
化学
物理化学
物理
工程类
热力学
光电子学
作者
Fangfang Wu,Youwei Wang,Pengchao Ruan,Xinxin Niu,Zheng Dang,Xilian Xu,Xiaobin Gao,Yanhui Cai,Wenxian Liu,Wenhui Shi,Xiehong Cao
标识
DOI:10.1016/j.mtener.2021.100842
摘要
Vanadium-based oxides with high theoretical specific capacity and open crystal structure are promising cathodes for aqueous zinc ion batteries. However, the frustrating dissolution and structural collapse of vanadium-based oxides, especially when cycling at a low current density, lead to severe performance degradation. Here, we demonstrate doping of Fe opens up a rapid Zn2+ diffusion channel, and results in a stable layer-structured vanadium oxide nanobelt (FeVO) with an expanded interlayer spacing up to 10.8 Å. This enables a cathode with high structural stability, leading to an outstanding cyclic stability of 300 cycles at a low current density of 0.5 A g−1 with a high retention of 94.6%. Even cycling at 0.2 A g−1, the Fe-doped vanadium oxide still maintains a retention of 93.6% after 150 cycles. A reversible co-intercalation mechanism of Zn2+ and H2O is further revealed via ex-situ X-ray powder diffraction (XRD) and X-ray photoelectron spectra techniques. Such boosted electrochemical performance is attributed to the large interlayer space providing ion diffusion path and a stable layered structure. These excellent characteristics of the prepared vanadium oxide cathode show great potential for high-performance aqueous zinc ion batteries.
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