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Issue 20, 2020
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A three-dimensional interconnected V6O13 nest with a V5+-rich state for ultrahigh Zn ion storage

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Abstract

Aqueous zinc ion batteries (ZIBs) have attracted intensive attention due to their low cost, environmental friendliness and high safety. However, exploring suitable cathode materials and a deep understanding of their energy storage mechanisms remain a daunting challenge. In this work, a three-dimensional (3D) nest-like V6O13 structure is grown on carbon cloth (CC) as a free-standing ZIB cathode. Such interconnected V6O13 nanoneedles forming a 3D nest structure provide a large accessible surface area to the electrolyte and rapid channels for Zn2+ diffusion, and V6O13 with a V5+-rich state allows for more possibilities of multielectron reaction upon Zn (de)intercalation. As a result, an aqueous ZIB based on the V6O13/CC cathode and low-cost ZnSO4 electrolyte shows an ultrahigh capacity of 520 mA h g−1 (at a current density of 0.5 A g−1), desirable rate capability and cycle life (showing a stable capacity of 335 mA h g−1 over 1000 cycles). Moreover, the Zn2+ storage mechanism is deeply investigated based on experimental data and density functional theory simulation, and flexible solid-state ZIBs are established based on such a V6O13/CC cathode to reveal its high functional flexibility and excellent electrochemical performance, showing great potential applications in high-performance and safe electronic devices.

Graphical abstract: A three-dimensional interconnected V6O13 nest with a V5+-rich state for ultrahigh Zn ion storage

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Supplementary files

Article information


Submitted
20 Mar 2020
Accepted
04 May 2020
First published
05 May 2020

J. Mater. Chem. A, 2020,8, 10370-10376
Article type
Paper

A three-dimensional interconnected V6O13 nest with a V5+-rich state for ultrahigh Zn ion storage

P. He, J. Liu, X. Zhao, Z. Ding, P. Gao and L. Fan, J. Mater. Chem. A, 2020, 8, 10370
DOI: 10.1039/D0TA03165H

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