介孔硅酸锰镁可充镁电池正极材料的制备及其电化学性能研究

doi:10.3724/SP.J.1077.2011.00129

无机材料学报 ›› 2011, Vol. 26 ›› Issue (2): 129-133.DOI: 10.3724/SP.J.1077.2011.00129 CSTR: 32189.14.SP.J.1077.2011.00129

介孔硅酸锰镁可充镁电池正极材料的制备及其电化学性能研究

努丽燕娜, 杨军, 郑育培, 王久林

上海交通大学化学化工学院, 上海 200240

收稿日期:2010-04-29 修回日期:2010-06-21 出版日期:2011-02-20 网络出版日期:2011-01-21
作者简介:努丽燕娜(1973-), 女, 副教授. E-mail: nlyn@sjtu.edu.cn
基金资助:
国家自然科学基金(20603022,20973112);国家973计划(2007CB209700)

Mesoporous Magnesium Manganese Silicate as a CathodeMaterial for Rechargeable Magnesium Batteries

NULI Yan-Na, YANG Jun, ZHENG Yu-Pei, WANG Jiu-Lin

Departmentof Chemical Engineering, Shanghai Jiao Tong University, Shanghai 200240, China

Received:2010-04-29 Revised:2010-06-21 Published:2011-02-20 Online:2011-01-21
Supported by:
National Natural Science Foundation of China (20973112 , 20603022); 973 Program ( 2007CB209700 )

摘要/Abstract

摘要： 采用介孔二氧化硅MCM-41作模板和硅源, 合成了具有介孔结构的可充镁电池正极材料硅酸锰镁. 分别用XRD、SEM、TEM和氮气吸脱附测试研究了合成材料的介孔结构, 并通过循环伏安、恒电流充放电测试比较了介孔与无孔硅酸锰镁材料的电化学性能. 由于介孔材料活性表面较大, 可增加电解液与活性材料的接触, 使材料具有较多的电化学反应位. 因而, 与相应的无孔材料相比, 具有介孔结构的硅酸锰镁材料呈现出较低的充放电极化、较大的放电容量和较高的放电电压平台. 在0.25 mol/L Mg(AlCl₂EtBu)₂/THF 电解液中, 0.2 C(约62.8 mA/g)充放电速率下, 介孔硅酸锰镁材料首次放电容量可达到241.8 mAh/g, 放电平台为1.65 V ( vs Mg/Mg²⁺). 设计具有介孔结构的材料为提高可充镁电池正极的电化学性能提供了一条有效的途径.

关键词: 可充镁电池, 正极材料, 介孔结构, 电化学性能, 硅酸锰镁

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

中图分类号:

TM911

努丽燕娜, 杨军, 郑育培, 王久林. 介孔硅酸锰镁可充镁电池正极材料的制备及其电化学性能研究[J]. 无机材料学报, 2011, 26(2): 129-133.

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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介孔硅酸锰镁可充镁电池正极材料的制备及其电化学性能研究

Mesoporous Magnesium Manganese Silicate as a CathodeMaterial for Rechargeable Magnesium Batteries

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