Electrochemical performance of LiFePO₄/(C+Fe₂P) composite cathode material synthesized by sol-gel method

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• 作者：Quan-qi Chen (12) qqchen@xtu.edu.cn
  Xiao-shuan Li (1)
  Jian-ming Wang (2)
• 关键词：Key words LiFePO4/(C+Fe2P) composite – ; sol ; gel – ; sphere ; like morphology – ; electrochemical performance
• 刊名：Journal of Central South University of Technology
• 出版时间：August 2011
• 出版年：2011
• 期刊代码：pc528_1005-9784
• 类别：et
• 卷：18
• 期：4
• 页码：978-984
• 数据来源：sp

摘要

A LiFePO₄/(C+Fe₂P) composite cathode material was prepared by a sol-gel method using Fe(NO₃)₃路9H₂O, LiAc路H₂O, NH₄H₂PO₄ and citric acid as raw materials, and the physical properties and electrochemical performance of the composite cathode material were investigated by X-ray diffractometry (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM) and electrochemical tests. The Fe₂P content, morphology and electrochemical performance of LiFePO₄/(C+Fe₂P) composite depend on the calcination temperature. The optimized LiFePO₄/(C+Fe₂P) composite is prepared at 650 掳C and the optimized composite exhibits sphere-like morphology with porous structure and Fe₂P content of about 3.2%(mass fraction). The discharge capacity of the optimized LiFePO₄/(C+Fe₂P) at 0.1C is 156 and 161 mA路h/g at 25 and 55 掳C, respectively, and the corresponding capacity retentions are 96%after 30 cycles; while the capacity at 1C is 142 and 149 mA路h/g at 25 and 55 掳C, respectively, and the capacity still remains 135 and 142 mA路h/g after 30 cycles at 25 and 55 掳C, respectively.