期刊
JOURNAL OF COLLOID AND INTERFACE SCIENCE
卷 560, 期 -, 页码 659-666出版社
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.jcis.2019.10.092
关键词
Zn-ion batteries; beta-AgVO3; Cathode; High performance; Energy storage mechanism
资金
- National Natural Science Foundation of China [51772249]
- Innovation Foundation for Doctor Dissertation of Northwestern Polytechnical University [CX201942]
- Fundamental Research Funds for the Central Universities [G2017KY0308, 3102019JC005]
- National Natural Science Foundation of Shaanxi Province [2018JM5092, 2019JLM-26]
- Innovation Program for Talent [2019KJXX066]
- Post-doctoral Program of Shaanxi Province [2018BSHTDZZ16]
- Hongkong Scholar Program [XJ2017012]
- Key R&D Program of Shaanxi [2017ZDCXL-GY-08-03]
Rechargeable aqueous Zn-ion batteries have shown considerable potential for stationary grid-scale energy storage systems owing to their characteristics of low cost and non-pollution. Nevertheless, the development of high-performance cathode materials is still a formidable challenge. In this work, for the first time, we report a superior silver vanadate (beta-AgVO3) cathode for Zn-ion batteries, and demonstrate the fundamental Zn2+ storage mechanism in detail. In sharp contrast to the previously-reported layered vandium-based materials, the beta-AgVO3 cathode experiences an initial phase transition to form a layered Zn3V2O7(OH)(2)center dot 2H(2)O through a displacement/reduction reaction of Zn2+/Ag+ in the first discharge process. The in situ generated Ag-0 along with the residual Ag+ and structural water within the framework afford high electronic/ionic conductivity, thus enabling enhanced Zn2+ intercalation/deintercalation kinetics in the layered phase. As a consequence, the cathode can deliver remarkable rate performance (103 mAh g(-1) at 5000 mA g(-1)) and long-term cycling stability (95 mAh g(-1) after 1000 cycles at 2000 mA g(-1) ). The present study offers a totally new insight into the exploration of non-layered-structured vandium-based cathodes for high performance Zn-ion batteries. (C) 2019 Elsevier Inc. All rights reserved.
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