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K+ intercalated V2O5 nanorods with exposed facets as advanced cathodes for high energy and high rate zinc-ion batteries

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Abstract

Aqueous rechargeable zinc-ion batteries (ARZIBs) have drawn enormous attention because of their low-cost and eco-friendly cell components. However, designing high-performance cathode materials towards practical application of ARZIBs remains a major challenge. Therefore, in this contribution, a comprehensive study on K+ intercalated V2O5 (KVO) nanorods with exposed facets as a high-performance cathode for ARZIBs is presented. The KVO cathode exhibits remarkable discharge capacities of 439 and 286 mAh g−1 at current densities of 50 and 3000 mA g−1, respectively. Furthermore, it recovers 96% of the capacity after 1500 cycles at 8000 mA g−1. Impressively, the Zn/KVO battery offers a specific energy of 121 W h kg−1 at high specific power of 6480 W kg−1. The storage mechanism of the KVO cathode in an ARZIB is systematically elucidated using in operando synchrotron X-ray diffraction, ex situ synchrotron X-ray absorption spectroscopy, ex situ TEM analyses and first-principles calculations. The superior performance of the cathode is attributed to its unique exposed layer structure with high surface energy, high conductivity and low migration barrier for Zn2+ migration. This study provides insight into designing high-performance cathode materials for ARZIBs and other electrochemical systems.

Graphical abstract: K+ intercalated V2O5 nanorods with exposed facets as advanced cathodes for high energy and high rate zinc-ion batteries

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Publication details

The article was received on 30 May 2019, accepted on 08 Aug 2019 and first published on 08 Aug 2019


Article type: Paper
DOI: 10.1039/C9TA05767F
J. Mater. Chem. A, 2019, Advance Article

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    K+ intercalated V2O5 nanorods with exposed facets as advanced cathodes for high energy and high rate zinc-ion batteries

    S. Islam, M. H. Alfaruqi, D. Y. Putro, V. Soundharrajan, B. Sambandam, J. Jo, S. Park, S. Lee, V. Mathew and J. Kim, J. Mater. Chem. A, 2019, Advance Article , DOI: 10.1039/C9TA05767F

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