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Issue 27, 2019
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Binder-free hierarchical VS2 electrodes for high-performance aqueous Zn ion batteries towards commercial level mass loading

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Abstract

Aqueous rechargeable zinc ion batteries with advantages of low cost and high level of safety have been considered as a promising candidate for large-scale energy storage. In this work, a freestanding, binder-free cathode comprising hierarchical VS2 in the 1T phase grown directly on a stainless steel mesh (VS2@SS) was developed for aqueous zinc ion batteries. The battery exhibited an excellent Zn ion storage capacity of 198 mA h g−1 and stable cycling performance (above 80% capacity retention over 2000 cycles at 2 A g−1). The detailed structural and chemical composition analyses revealed the phase evolution of VS2 and the reversible Zn ion insertion/extraction mechanism during the charge/discharge process. Notably, with an increased mass loading of VS2 over the commercial level (∼11 mg cm−2), a long-term cycling stability with 90% capacity retention after 600 cycles (only 0.017% loss per cycle) could be achieved, which suggests that the electrodes are promising for practical applications. Furthermore, flexible solid-state Zn ion batteries were demonstrated by using the VS2@SS electrodes, and reliable electrochemical performance could be observed even after 200 cycles.

Graphical abstract: Binder-free hierarchical VS2 electrodes for high-performance aqueous Zn ion batteries towards commercial level mass loading

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Supplementary files

Article information


Submitted
08 May 2019
Accepted
14 Jun 2019
First published
15 Jun 2019

J. Mater. Chem. A, 2019,7, 16330-16338
Article type
Paper

Binder-free hierarchical VS2 electrodes for high-performance aqueous Zn ion batteries towards commercial level mass loading

T. Jiao, Q. Yang, S. Wu, Z. Wang, D. Chen, D. Shen, B. Liu, J. Cheng, H. Li, L. Ma, C. Zhi and W. Zhang, J. Mater. Chem. A, 2019, 7, 16330
DOI: 10.1039/C9TA04798K

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