Preparation, characterization and electrochemical properties of mesoporous LiFe0.99Mo0.01PO4/C
Preparation, characterization and electrochemical properties of mesoporous LiFe0.99Mo0.01PO4/C
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DOI：
10.1007/s12598-009-0062-y
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发表时间：
2009-07
期刊：
影响因子：
8.8
通讯作者：
Chunyang Yu;Zhongli Wang;Yu Chen;D. Xia;Wangsheng Chu;Ziyu Wu
中科院分区：
文献类型：
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作者：
Chunyang Yu;Zhongli Wang;Yu Chen;D. Xia;Wangsheng Chu;Ziyu Wu
以(NH4)2MoO4为掺杂起始原料，采用溶胶-凝胶法合成了LiFe0.99Mo0.01PO4/C介孔复合材料。在所制备的材料中同时实现了导电碳、金属掺杂和介孔的形成。用X射线衍射仪、扫描电子显微镜、透射电子显微镜、扩展X射线吸收精细结构、X射线吸收近结构能谱等手段对样品的晶体结构和微观结构进行了表征，并用氮气吸附技术测定了样品的比表面积。采用循环伏安法(CV)和充放电循环性能对其进行了表征。结果表明，介孔材料LiFe0.99Mo0.01PO4/C在0.1C、1C和5C下的可逆容量分别为160mAh/g、135mAhg/g和90mAhg/g。容量衰落是可以忽略的。
A mesoporous LiFe0.99Mo0.01PO4/C composite was synthesized by the sol-gel method using (NH4)2MoO4as a doping starting material. The formation of conductive carbon, metal doping and mesopores was achieved simultaneously in the prepared material. The characterizations of crystal structures and microstructures were investigated using X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), extended X-ray-absorption fine-structure (EXAFS) and X-ray-absorption near-structure spectroscopy (XANES), while the surface area was determined using N2adsorption techniques. Cyclic voltammetry (CV) and charge-discharge cycling performance were used to characterize its electrochemical properties. The sample possessed uniformly distributed mesopores with an average pore size of 4 nm, and the specific surface area was about 69.368 m2/g. The results show that the reversible capacity of mesoporous LiFe0.99Mo0.01PO4/C is about 160 mAh/g at 0.1C, 135 mAh/g at 1C and 90 mAh/g at 5C, respectively. The capacity fading is neglectable.