Synthesis and characterization of nano-LiFePO4/carbon composite cathodes from 2-methoxyethanol–water system
Synthesis and characterization of nano-LiFePO4/carbon composite cathodes from 2-methoxyethanol–water system
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DOI：
10.1016/j.jallcom.2007.05.031
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发表时间：
2008-07
影响因子：
6.2
通讯作者：
Hui Liu;Jing-ying Xie;Ke Wang
中科院分区：
文献类型：
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作者：
Hui Liu;Jing-ying Xie;Ke Wang
以硝酸铁、磷酸二氢锂为原料，以乙二醇-水溶液为介质，采用溶胶-凝胶法合成了纳米LiFePO 4/碳复合正极材料。X射线衍射分析、场发射扫描电子显微镜和透射电子显微镜观察表明，热处理后的粉体中出现了结晶良好的橄榄石结构的LiFePO 4，平均粒径约为65 nm，分布均匀。在热处理过程中，蔗糖在LiFePO 4颗粒表面分解，原位形成碳导电网结构。纳米LiFePO 4/碳复合材料具有良好的物理特性，表现出优异的倍率性能和循环性能，50次循环后的放电容量为103 mAhg −1（10 C充放电倍率）。
Using 2-methoxyethanol–water solution as the media, nano-LiFePO4/carbon composite cathodes material have been synthesized via a simple and new sol–gel route from iron nitrate, lithium dihydrogen phosphate. X-ray diffraction analysis, field emission scanning electron microscopy and transmission electron microscope observations showed that LiFePO4with a well-crystallized olivine structure appeared in the heat-treated powder and the average particle size was about 65nm with uniform distribution. In the process of heat treatment, the sucrose decomposed on the surface of LiFePO4particles to in situ form carbon conductive webs structure. The favorable physical characteristics of the nano-LiFePO4/carbon composite materials exhibited excellent rate performance and cyclability, delivering a discharge capacity of 103mAhg−1(10C charge/discharge rate) after 50 cycles.