Fe-doping enabled a stable vanadium oxide cathode with rapid Zn diffusion channel for aqueous zinc-ion batteries

被引：98

作者：

Wu, Fangfang ^{[1
]}

Wang, Youwei ^{[1
]}

Ruan, Pengchao ^{[1
]}

Niu, Xinxin ^{[1
]}

Zheng, Dong ^{[1
]}

Xu, Xilian ^{[1
]}

Gao, Xiaobin ^{[1
]}

Cai, Yanhui ^{[1
]}

Liu, Wenxian ^{[1
]}

Shi, Wenhui ^{[2
]}

Cao, Xiehong ^{[1
]}

机构：

[1] Zhejiang Univ Technol, Coll Mat Sci & Engn, 18 Chaowang Rd, Hangzhou 310014, Zhejiang, Peoples R China

[2] Zhejiang Univ Technol, Ctr Membrane Separat & Water Sci & Technol, 18 Chaowang Rd, Hangzhou 310014, Zhejiang, Peoples R China

来源：

MATERIALS TODAY ENERGY | 2021年 / 21卷

基金：

中国国家自然科学基金;

关键词：

Aqueous zinc ion batteries; Vanadium oxides; High stability; Cathodes; Doping; V2O5; GROWTH;

D O I：

10.1016/j.mtener.2021.100842

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

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 angstrom. 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 cointercalation 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 highperformance aqueous zinc ion batteries. (C) 2021 Elsevier Ltd. All rights reserved.

引用

页数：7

共 52 条

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