Mesoporous Magnesium Manganese Silicate as a CathodeMaterial for Rechargeable Magnesium Batteries

doi:10.3724/SP.J.1077.2011.00129

Abstract

Abstract: Mesoporousmagnesium manganese silicate as a cathode material for rechargeable magnesiumbatteries was prepared using mesoporous silica MCM-41 as both template and siliconsource. X-ray diffraction (XRD), scanning electron microscope (SEM),transmissionelectron microscope (TEM) and N₂ adsorption-desorption measurementswere performed to characterize the mesoporous structure of the as-preparedmaterial. Furthermore, the electrochemical performance of mesoporous and bulkmaterials were compared by cyclic voltammetry and direct currentcharge-discharge measurements. The larger surface area of the mesoporous material favors the efficientcontact between active material and electrolyte, providing more active sitesfor the electrochemical reaction. As a result, the mesoporous material exhibitsbetter electrochemical performance with lower polarization for magnesium de-intercalationand intercalation, larger discharge capacity and higher discharge flat plateaucompared with corresponding bulk material. In 0.25 mol/L Mg(AlCl₂EtBu)₂/THFelectrolyte, the initialdischarge capacity and discharge voltage plateau of the mesoporous material canreach 241.8 mAh/g and 1.65V, respectively. The mesoporous structure may providea new approach to improve the reaction activity of the cathode materials for rechargeablemagnesium batteries.

Key words: rechargeable magnesium batteries, cathodematerials mesoporous structure, electrochemical performance, magnesium manganese silicate

CLC Number:

TM911

NULI Yan-Na, YANG Jun, ZHENG Yu-Pei, WANG Jiu-Lin. Mesoporous Magnesium Manganese Silicate as a CathodeMaterial for Rechargeable Magnesium Batteries[J]. Journal of Inorganic Materials, 2011, 26(2): 129-133.

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