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Ultrathin TiO2-B Nanowires as Anode Material for Mg-Ion Batteries Based on a Surface Mg Storage Mechanism

Abstract

Ultrathin TiO2-B nanowires with naked (-110) surface were prepared by a hydrothermal process and used as the anode material for Mg-ion batteries. The material delivered a reversible Mg2+ ion capacity of 110 mAh∙g-1 at the 0.1 C rate. Excellent cycle stability was achieved with a small capacity-fading rate of 0.08 % per cycle. In addition, a discharge capacity of 34 mAh∙g-1 was obtained at the 50 C rate, demonstrating the material’s excellent high rate capability. First-principles calculations showed that Mg2+ ions hardly penetrated into the TiO2-B lattice because of a very large Mg2+ ion diffusion barrier of 0.63 eV. Instead, the Mg2+ ions were stored at the 4-coordinated vacancies of TiO2-B nanowire (-110) surfaces. The adsorbed Mg2+ ions were bonded with unpaired surface oxygen atoms. Meanwhile, a small amount of electrons were transferred from the O-2p state to the Ti-3d state.

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Publication details

The article was received on 16 May 2017, accepted on 28 Jul 2017 and first published on 31 Jul 2017


Article type: Paper
DOI: 10.1039/C7NR03493H
Citation: Nanoscale, 2017, Accepted Manuscript
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    Ultrathin TiO2-B Nanowires as Anode Material for Mg-Ion Batteries Based on a Surface Mg Storage Mechanism

    Y. Meng, D. Wang, Y. Zhao, R. Lian, Y. Wei, X. Bian, Y. Gao, F. Du, B. Liu and G. Chen, Nanoscale, 2017, Accepted Manuscript , DOI: 10.1039/C7NR03493H

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