Journal
ELECTROCHIMICA ACTA
Volume 354, Issue -, Pages -Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.electacta.2020.136721
Keywords
Aqueous zinc-ion battery; V10O24 center dot 12H(2)O; Sepiolite; Self-supporting; Hydrophilicity
Categories
Funding
- Natural Science Foundation of Hunan Province [2020JJ5737]
- National Science Fund for distinguished Young Scholars [51225403]
- Central South University [ZLXD2017005]
- National Ten Thousand Talents Program in China
- Hunan Provincial Science and Technology Project [2016RS2004, 2015TP1006]
- Innovation Driven Plan of Central South University [2016CX015]
- ShengHua Scholar Project of CSU
- State Key Laboratory of Powder Metallurgy, Central South University [2015-19]
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The preparation of cathode materials for aqueous Zn-ion batteries (ZIBs) with excellent electrochemical properties is an attractive research focus. However, the large size and high polarization of hydrated zinc ions limit the diffusion kinetics of Zn2+/electron, and the side reactions in the system also affect the performance of the battery. Herein, we present a novel hydrophilic self-supporting composite cathode for aqueous ZIBs, which employs V10O24 center dot 12H(2)O as active materials, acid-treated natural sepiolite and carbon nanotubes as structural and interfacial modifiers. It is demonstrated that the devices exhibit a high specific capacity of 191 mAh g(-1) at a current density of 500 mA g(-1) (93.6% retention after 100 cycles) and excellent rate performance. This good electrochemical performance is mainly related to the formation of hydrophilic surface/interface, the design of self-supporting and the good conductivity of the composite electrode. Specifically, the addition of acid-treated natural sepiolite and carbon nanotubes could improve the mechanical properties, hydrophilicity and the conductivity of electrode materials, respectively, making this strategy a promising choice for ZIBs. (C) 2020 Elsevier Ltd. All rights reserved.
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