介孔四氧化三锰纳米棒的快速低成本制备与电化学性能(英文)  

Rapid Low-cost Synthesis and Enhanced Electrochemical Properties of Mesoporous Mn_3O_4 Nanorods

作　　者：胡英瑛[1] 温兆银[1] 靳俊[1] 

机构地区：[1]中国科学院上海硅酸盐研究所,上海200050

出　　处：《无机材料学报》2013年第9期1045-1050,共6页Journal of Inorganic Materials

基　　金：Foundation item:National Natural Science Foundation of China(50730001);Chinese Science and Technology Ministry(2007 CB 209700)

摘　　要：仅以乙醇和四水合醋酸锰为原料, 快速低成本地合成了介孔四氧化三锰 纳米棒, 并将其应用于锂离子电池负极材料。通过 X 射线衍射、热重分析仪、扫描电子显微镜、透射电子显微镜和比表面积仪等分析手段对四氧化三锰样品进行了表征。实验结果表明： 介孔四氧化三锰纳米棒的平均直径约为 150 nm, 孔的尺寸范围为 6~20 nm, BET 比表面积高达 37.3 m2/g。同时, 介孔四氧化三锰纳米棒负极材料在 141 mA/g 的电流密度下循环 100 次后可逆充放电容量为 676.1 和 662.4 mAh/g, 而且其在不同的电流密度下继续循环 80 次后可逆放电容量高达 850 mAh/g, 体现出了较高的容量、好的循环稳定性能和倍率性能。Mesoporous Mn3O4 nanorods, as anode materials for Li-ion batteries, were fabricated by a novel process using only ethanol and manganese acetate tetrahydrate as the reaction precursors. The as-prepared mesoporous Mn3O4 nanorods were characterized by X-ray diffraction, thermogravimetry-differential scanning calorimetry, scanning elec- tron microscope, transmission electron microscope and Brunauer-Emmett-Teller surface area analyzer. The results in- dicate that the average diameter ofmesoporous Mn3O4 nanorods is about 150 nm, and their pore size is mainly distrib- uted in the range of 6-20 nm with the BET specific surface area as high as 37.3 mE/g. The Mn3O4 nanorods anode dis- plays reversible capacities of 676.1 and 662.4 mAh/g after 100 cycles at a current rate of 141 mA/g, demonstrating a higher capacity and more stable cyclability than Mn3O4 nano-powders. Furthermore, excellent rate capability is real- ized with the mesoporous Mn3O4 nanorods. A capacity of 850 mAh/g is retained after 80 cycles at various current den- sities.

关 键 词：氧化锰 介孔 纳米棒 锂离子电池 

分 类 号：TB34[一般工业技术—材料科学与工程]