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Issue 28, 2018
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New anatase phase VTi2.6O7.2 ultrafine nanocrystals for high-performance rechargeable magnesium-based batteries

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Abstract

Magnesium-based batteries are regarded as a potential candidate for next-generation energy storage devices due to their safety and low cost. However, existing cathode materials still suffer from slow ion diffusion kinetics and relatively inferior electrochemical performance. In this work, we design and synthesize a kind of new anatase phase VTi2.6O7.2 ultrafine nanocrystal (VTO) with fast intercalation kinetics. As a cathode material for magnesium batteries (MBs), VTO exhibits a capacity of 121.9 mA h g−1 at 20 mA g−1. When applied to magnesium–lithium hybrid batteries (MLHBs), VTO exhibits a high specific capacity (265.2 mA h g−1 at 50 mA g−1), good cycling stability (84.2% capacity retention after 1200 cycles) and high rate capability (64.9 mA h g−1 at 2 A g−1). These good performances are attributed to the enhanced diffusion kinetics, increased cation storage active sites and shortened ion diffusion path. Furthermore, the lithium storage mechanism in VTO was studied via the in situ XRD measurements. These results show that VTO is a promising electrode material for magnesium-based batteries, and constructing a substitutional solid solution is an effective way to exploit and optimize new types of electrode materials with enhanced performances.

Graphical abstract: New anatase phase VTi2.6O7.2 ultrafine nanocrystals for high-performance rechargeable magnesium-based batteries

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Publication details

The article was received on 24 Feb 2018, accepted on 12 Jun 2018 and first published on 13 Jun 2018


Article type: Paper
DOI: 10.1039/C8TA01818A
Citation: J. Mater. Chem. A, 2018,6, 13901-13907
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    New anatase phase VTi2.6O7.2 ultrafine nanocrystals for high-performance rechargeable magnesium-based batteries

    J. Sheng, C. Peng, S. Yan, G. Zhang, Y. Jiang, Q. An, Q. Wei, Q. Ru and L. Mai, J. Mater. Chem. A, 2018, 6, 13901
    DOI: 10.1039/C8TA01818A

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