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New Anatase Phase VTi2.6O7.2 Ultrafine Nanocrystals for High-Performance Rechargeable Magnesium-Based Batteries

Abstract

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

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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, Accepted Manuscript
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    New Anatase Phase VTi2.6O7.2 Ultrafine Nanocrystals for High-Performance Rechargeable Magnesium-Based Batteries

    J. Sheng, P. Chen, S. Yan, G. Zhang, Y. Jiang, Q. An, Q. Ru, Q. Wei and L. Mai, J. Mater. Chem. A, 2018, Accepted Manuscript , DOI: 10.1039/C8TA01818A

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