LAUSR

Abstract 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.