LiFePO4/C composites derived from precipitated FePO4 precursor: effects of mixing processes

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• 作者：Zhenxin Liu (1) (2)
  Jingjing Li (2)
  Yu Xing (2)
  Lizhen Wang (2)
  Shaoming Fang (2)
  Bei Xu (2)
  Xiongwei Qu (3)
  
• 关键词：Li ; ion batteries ; Cathodes ; Charging/discharging ; Materials preparations
• 刊名：Ionics
• 出版年：2014
• 出版时间：November 2014
• 年：2014
• 卷：20
• 期：11
• 页码：1511-1516
• 全文大小：1,093 KB
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• 作者单位：Zhenxin Liu (1) (2)
  Jingjing Li (2)
  Yu Xing (2)
  Lizhen Wang (2)
  Shaoming Fang (2)
  Bei Xu (2)
  Xiongwei Qu (3)
  
  1. School of Materials Science and Engineering, Hebei University of Technology, Tianjin, 300130, China
  2. Henan Provincial Key Laboratory of Surface and Interface Science, School of Materials and Chemical Engineering, Zhengzhou University of Light Industry, Zhengzhou, 450002, China
  3. School of Chemical Engineering, Hebei University of Technology, Tianjin, 300130, China
  
• ISSN：1862-0760

文摘

Grinding, general incipient wetness and competitive incipient wetness were investigated on the preparation of LiFePO4/C (LFP) composites from precipitated FePO4 precursor. This article focuses on the fundamental details of mixing processes for LFP production, of which the literature is sparse. The structure features of LiFePO4/C composites were analyzed by X-ray diffraction (XRD), while the morphologies were characterized by field emission scanning electron microscopy (FESEM). The electrochemical performances were studied by galvanostatic charge/discharge measurements. Both mixing processes and lithium sources are capable of affecting the electrochemical performances by altering the crystallinity, the quality of carbon coating, or even the impurity formation of LiFePO4/C composites. Liquid alkalis caused the formation of impurities and mild decrease of crystallinity, whereas competitive cations did not produce impurities but significantly decreased the crystallinity of LiFePO4/C composites.