Ultrathin TiO2-B nanowires as an anode material for Mg-ion batteries based on a surface Mg storage mechanism. Issue 35 (23rd August 2017)

• Record Type: Journal Article
• Authors: Meng, Yuan; Wang, Dashuai; Zhao, Yingying; Lian, Ruqian; Wei, Yingjin; Bian, Xiaofei; Gao, Yu; Du, Fei; Liu, Bingbing; Chen, Gang
• Is Part Of: Nanoscale. Volume 9:Issue 35(2017)
• Page Start: 12934
• Page End: 12940
• Publication Date: 2017-08-23
• Subjects: Nanoscience -- Periodicals; Nanotechnology -- Periodicals; 620.505
• DOI: 10.1039/c7nr03493h
• Languages: English
• ISSNs: 2040-3364

Abstract

Abstract : Ultrathin TiO2 -B nanowires with a naked (−110) surface were prepared by a hydrothermal process and used as the anode material for Mg-ion batteries. Abstract : Ultrathin TiO2 -B nanowires with a naked (−110) surface were prepared by a hydrothermal process and used as the anode material for Mg-ion batteries. The material delivered a reversible Mg 2+ ion capacity of 110 mA h g −1 at the 0.1C rate. Excellent cycling stability was achieved with a small capacity-fading rate of 0.08% per cycle. In addition, a discharge capacity of 34 mA h g −1 was obtained at the 50C rate, demonstrating the material's excellent high rate capability. First-principles calculations showed that Mg 2+ ions hardly penetrated into the TiO2 -B lattice because of a very large Mg 2+ ion diffusion barrier of 0.63 eV. Instead, the Mg 2+ ions were stored at the 4-coordinated vacancies of TiO2 -B nanowire (−110) surfaces. The adsorbed Mg 2+ 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.