Journal
JOURNAL OF INORGANIC MATERIALS
Volume 26, Issue 2, Pages 129-133Publisher
SCIENCE CHINA PRESS
DOI: 10.3724/SP.J.1077.2011.00129
Keywords
rechargeable magnesium batteries; cathode materials mesoporous structure; electrochemical performance; magnesium manganese silicate
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Funding
- National Natural Science Foundation of China [20973112, 20603022]
- 973 Program [2007CB209700]
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Mesoporous magnesium manganese silicate as a cathode material for rechargeable magnesium batteries was prepared using mesoporous silica MCM-41 as both template and silicon source. X-ray diffraction (XRD), scanning electron microscope (SEM), transmission electron microscope (TEM) and N(2) adsorption-desorption measurements were performed to characterize the mesoporous structure of the as-prepared material. Furthermore, the electrochemical performance of mesoporous and bulk materials were compared by cyclic voltammetry and direct current charge-discharge measurements. The larger surface area of the mesoporous material favors the efficient contact between active material and electrolyte, providing more active sites for the electrochemical reaction. As a result, the mesoporous material exhibits better electrochemical performance with lower polarization for magnesium de-intercalation and intercalation, larger discharge capacity and higher discharge flat plateau compared with corresponding bulk material. In 0.25 mol/L Mg(AlCl(2)EtBu)(2)/THF electrolyte, the initial discharge capacity and discharge voltage plateau of the mesoporous material can reach 241.8 mAh/g and 1.65V, respectively. The mesoporous structure may provide a new approach to improve the reaction activity of the cathode materials for rechargeable magnesium batteries.
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