Improved electrochemical performance of nano-crystalline Li2FeSiO4/C cathode material prepared by the optimization of sintering temperature

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• 作者：Pengjian Zuo (1)
  Tao Wang (1)
  Guangyu Cheng (1)
  Chunyu Du (1)
  Yulin Ma (1)
  Xinqun Cheng (1)
  Geping Yin (1)
  
• 关键词：Lithium ; ion battery ; Lithium iron silicate ; Cathode materials ; Sintering temperature ; Electrochemical performance
• 刊名：Journal of Solid State Electrochemistry
• 出版年：2013
• 出版时间：July 2013
• 年：2013
• 卷：17
• 期：7
• 页码：1955-1959
• 全文大小：806KB
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• 作者单位：Pengjian Zuo (1)
  Tao Wang (1)
  Guangyu Cheng (1)
  Chunyu Du (1)
  Yulin Ma (1)
  Xinqun Cheng (1)
  Geping Yin (1)
  
  1. School of Chemical Engineering and Technology, Harbin Institute of Technology, Harbin, 150001, China
  
• ISSN：1433-0768

文摘

Li2FeSiO4/C cathode materials have been prepared using the conventional solid-state method by varying the sintering temperature (650?°C, 700?°C and 750?°C), and the structure and electrochemical performance of Li2FeSiO4/C materials are investigated by X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), galvanostatic charge–discharge tests, respectively. The results show that Li2FeSiO4 nano-crystals with a diameter of about 6-?nm are inbedded in the amorphous carbon, and the Li2FeSiO4/C material obtained at 700?°C exhibits an initial discharge capacity of 195?mA?h g? at 1/16 C in the potential range of 1.5-.8?V. The excellent electrochemical performance of Li2FeSiO4/C attributes to the improvement of conductivity and reduction of impurity by the optimization of the sintering temperature.