High-performance zinc-ion batteries enabled by electrochemically induced transformation of vanadium oxide cathodes

被引：0

作者：

Li Y. ^{[1
]}

Yang W. ^{[2
]}

Huang Y. ^{[3
]}

Wang G. ^{[2
]}

Xu C. ^{[3
]}

Kang F. ^{[3
]}

Dong L. ^{[1
,2
]}

机构：

[1] College of Chemistry and Materials Science, Jinan University, Guangzhou, 511443, Guangdong

[2] Centre for Clean Energy Technology, University of Technology Sydney, 2007, NSW

[3] Tsinghua Shenzhen International Graduate School, Tsinghua University, Shenzhen, 518055, Guangdong

来源：

Journal of Energy Chemistry | 2021年 / 60卷

基金：

澳大利亚研究理事会; 中国国家自然科学基金;

关键词：

Cathode material; Electrochemically induced transformation; Vanadium oxide; Zinc-ion battery;

D O I：

10.1016/j.jechem.2021.01.025

中图分类号：

学科分类号：

摘要：

Rechargeable aqueous zinc-ion batteries (ZIBs) have become a research hotspot in recent years, due to their huge potential for high-energy, fast-rate, safe and low-cost energy storage. To realize good electrochemical properties of ZIBs, cathode materials with prominent Zn2+ storage capability are highly needed. Herein, we report a promising ZIB cathode material based on electrochemically induced transformation of vanadium oxides. Specifically, K2V6O16·1.5H2O nanofibers were synthesized through a simple stirring method at near room temperature and then used as cathode materials for ZIBs in different electrolytes. The cathode presented superior Zn2+ storage capability in Zn(OTf)2 aqueous electrolyte, including high capacity of 321 mAh/g, fast charge/discharge ability (96 mAh/g delivered in 35 s), high energy density of 235 Wh/kg and good cycling performance. Mechanism analysis evidenced that in Zn(OTf)2 electrolyte, Zn2+ intercalation in the first discharge process promoted K2V6O16·1.5H2O nanofibers to transform into Zn3+xV2O7(OH)2·2H2O nanoflakes, and the latter served as the Zn2+-storage host in subsequent charge/discharge processes. Benefiting from open-framework crystal structure and sufficiently exposed surface, the Zn3+xV2O7(OH)2·2H2O nanoflakes exhibited high Zn2+ diffusion coefficient, smaller charge-transfer resistance and good reversibility of Zn2+ intercalation/de-intercalation, thus leading to superior electrochemical performance. While in ZnSO4 aqueous electrolyte, the cathode material cannot sufficiently transform into Zn3+xV2O7(OH)2·2H2O, thereby corresponding to inferior electrochemical behaviors. Underlying mechanism and influencing factors of such a transformation phenomenon was also explored. This work not only reports a high-performance ZIB cathode material based on electrochemically induced transformation of vanadium oxides, but also provides new insights into Zn2+-storage electrochemistry. © 2021 Science Press

引用

页码：233 / 240

页数：7

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