Study the structure and electrochemical performance of BaTiO3/S electrode for magnesium-ion batteries

• Published in: Materials letters 2021-02, Vol.284, p.129033, Article 129033
• Main Authors: Sheha, E., Kamar, E.M., Fan, Li-Zhen
• Format: Article
• Language: English
• Subjects: Barium titanates; BaTiO3; Composite materials; Diffusion coefficient; Electrochemical analysis; Electrochemical impedance spectroscopy; Electrode materials; Electrodes; Energy storage and conversion; Magnesium; Magnesium battery; Materials science; Rechargeable batteries; Room temperature; Sulfur
• ISSN: 0167-577X; 1873-4979
• DOI: 10.1016/j.matlet.2020.129033

•The BaTiO3/S nanocomposite is synthesized by a sonochemical method.•The BaTiO3/S nanocomposite exhibits 270 mA h g−1 at 55 °C.•APC electrolyte decomposes at the surface of the cathode result irreversible electrolyte/electrode interface.•DMg2+ ~ 10−22 cm2 s−1 confirms high Mg diffusion energy barrier in the framework of BTO and BTO/S. This paper is an attempt to design new cathodic materials for rechargeable magnesium batteries (RMBs) via combining sulfur (S) with BaTiO3 (BTO) by a sono-chemical method. X-ray diffraction (XRD) demonstrates that the introduction of sulfur within the framework of a tetragonal BTO results a small shift of the (101) plane of BTO from 31.44° to 31.61°. The electrochemical performance of the composite is analyzed by cyclic voltammetry (CV), electrochemical impedance spectroscopy and battery testing system. CV curves of BaTiO3 and BTO_S composite electrodes show capacitive behavior correspond to reactions at the cathode surface with magnesium ions. BaTiO3 and BTO_S composite electrodes display low diffusion coefficient of Mg2+ ~10−22 cm2 s−1. Mg/BTO and Mg/(BTO_S) button cells deliver initial discharge capacity of 1.6/1.4 mAh g−1, at room temperature and 315/270 mA h g−1 at 55 °C, respectively.