Synthesis and optimization of three-dimensional lamellar LiFePO4 and nanocarbon composite cathode materials by polyol process
Synthesis and optimization of three-dimensional lamellar LiFePO4 and nanocarbon composite cathode materials by polyol process
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多元醇法制备三维层状LiFePO4与纳米碳复合正极材料的合成与优化
DOI：
10.1016/j.ceramint.2015.09.063
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发表时间：
2016
影响因子：
5.2
通讯作者：
Pengcheng Wang
中科院分区：
文献类型：
--
作者：
Jiming Lu;Yingke Zhou;Tingting Jiang;Xiaohui Tian;Xiaofeng Tu;Pengcheng Wang
采用原位多元醇法合成了三维层状LiFePO4复合正极材料（碳纳米管纳米碳和石墨烯）。进行了一系列实验来优化纳米碳的含量以及后热处理的温度和持续时间。通过扫描电子显微镜、X射线衍射、透射电子显微镜、能谱和X射线光电子能谱对复合材料的形貌和微观结构进行了表征。通过恒流充放电测试、循环伏安法和电化学阻抗技术研究了其电化学性能。研究发现，通过适当的实验条件，可以优化LiFePO4的形貌和晶体结构，从而提高其电化学性能。优化后的复合材料在0.1和1 C下的放电比容量显着提高，分别为163和127 mAh g−1，并且在1 C下100次循环后容量保持率接近99%，在锂离子动力电池中具有广阔的应用前景。
Three-dimensional lamellar LiFePO4composite cathode materials (with nanocarbon of carbon nanotube and graphene) have been synthesized by anin-situpolyol process. A series of experiments have been conducted to optimize the content of nanocarbon, and the temperature and duration of the post heat treatment. The morphologies and microstructures of the composites were characterized by scanning electron microscopy, X-ray diffraction, transmission electron microscopy, energy dispersive spectroscopy and X-ray photoelectron spectroscopy. The electrochemical properties were investigated by constant current charge/discharge tests, cyclic voltammetry and electrochemical impedance techniques. It’s found that the morphology and crystal structure could be optimized to improve the electrochemical performance of LiFePO4by the appropriate experimental conditions. The optimized composite materials present greatly enhanced specific discharge capacities of 163 and 127 mAh g−1at 0.1 and 1 C, along with excellent capacity retention close to 99% after 100 cycles at 1 C, which are promising for applications in lithium-ion power batteries.
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