SCI和EI收录∣中国化工学会会刊

Chinese Journal of Chemical Engineering ›› 2014, Vol. 22 ›› Issue (5): 590-595.DOI: 10.1016/S1004-9541(14)60067-7

• 催化、动力学与反应工程 • 上一篇    下一篇

A Facile Route for Synthesis of LiFePO4/C Cathode Material with Nano-sized Primary Particles

肖政伟, 胡国荣, 杜柯, 彭忠东   

  1. 1 Faculty of Metallurgical and Energy Engineering, Kunming University of Science and Technology, Kunming 650093, China;
    2 School of Metallurgy and Environment, Central South University, Changsha 410083, China
  • 收稿日期:2013-03-22 修回日期:2013-07-07 出版日期:2014-05-28 发布日期:2014-05-06
  • 通讯作者: XIAO Zhengwei,E-mail: csuxiao@163.com
  • 基金资助:

    Supported partially by the Natural Science Foundation of Yunnan Province (2010ZC051) and Analysis and Testing Foundation (2009-041) and Starting Research Fund (14118245) from Kunming University of Science and Technology.

A Facile Route for Synthesis of LiFePO4/C Cathode Material with Nano-sized Primary Particles

XIAO Zhengwei, HU Guorong, DU Ke, PENG Zhongdong   

  1. 1 Faculty of Metallurgical and Energy Engineering, Kunming University of Science and Technology, Kunming 650093, China;
    2 School of Metallurgy and Environment, Central South University, Changsha 410083, China
  • Received:2013-03-22 Revised:2013-07-07 Online:2014-05-28 Published:2014-05-06
  • Supported by:

    Supported partially by the Natural Science Foundation of Yunnan Province (2010ZC051) and Analysis and Testing Foundation (2009-041) and Starting Research Fund (14118245) from Kunming University of Science and Technology.

摘要: A facile and practical route was introduced to prepare LiFePO4/C cathode material with nano-sized primary particles and excellent electrochemical performance. LiH2PO4 was synthesized by using H3PO4 and LiOH as raw materials. Then, as-prepared LiH2PO4, reduced iron powder and α-D-glucose were ball-milled, dried and sintered to prepare LiFePO4/C. X-ray diffractometry was used to characterize LiH2PO4, ball-milled product and LiFePO4/C. Differential scanning calorimeter-thermo gravimetric analysis was applied to investigate possible reactions in sintering and find suitable temperature for LiFePO4 formation. Scanning electron microscopy was employed for the morphology of LiFePO4/C. As-prepared LiH2PO4 is characterized to be in P21cn(33) space group, which reacts with reduced iron powder to form Li3PO4, Fe3(PO4)2 and H2 in ball-milling and sintering. The appropriate temperature for LiFePO4/C synthesis is 541.3-976.7℃. LiFePO4/C prepared at 700℃ presents nano-sized primary particles forming aggregates. Charge-discharge examination indicates that as-prepared LiFePO4/C displays appreciable discharge capacities of 145 and 131 mA·h·g-1 at 0.1 and 1 C respectively and excellent discharge capacity retention.

关键词: lithium ion cell, reduced iron powder, ball-milling, LiFePO4/C, nano-sized primary particle

Abstract: A facile and practical route was introduced to prepare LiFePO4/C cathode material with nano-sized primary particles and excellent electrochemical performance. LiH2PO4 was synthesized by using H3PO4 and LiOH as raw materials. Then, as-prepared LiH2PO4, reduced iron powder and α-D-glucose were ball-milled, dried and sintered to prepare LiFePO4/C. X-ray diffractometry was used to characterize LiH2PO4, ball-milled product and LiFePO4/C. Differential scanning calorimeter-thermo gravimetric analysis was applied to investigate possible reactions in sintering and find suitable temperature for LiFePO4 formation. Scanning electron microscopy was employed for the morphology of LiFePO4/C. As-prepared LiH2PO4 is characterized to be in P21cn(33) space group, which reacts with reduced iron powder to form Li3PO4, Fe3(PO4)2 and H2 in ball-milling and sintering. The appropriate temperature for LiFePO4/C synthesis is 541.3-976.7℃. LiFePO4/C prepared at 700℃ presents nano-sized primary particles forming aggregates. Charge-discharge examination indicates that as-prepared LiFePO4/C displays appreciable discharge capacities of 145 and 131 mA·h·g-1 at 0.1 and 1 C respectively and excellent discharge capacity retention.

Key words: lithium ion cell, reduced iron powder, ball-milling, LiFePO4/C, nano-sized primary particle