高等学校化学学报

高等学校化学学报

• 研究论文 • 上一篇    下一篇

以Fe2O3为原料制备LiFePO4/C复合材料及其性能研究

王冠, 苏刚, 严曼明, 蔡文斌, 江志裕   

  1. 复旦大学化学系, 上海分子催化和功能材料重点实验室, 上海 200433
  • 收稿日期:2006-02-09 修回日期:1900-01-01 出版日期:2007-01-10 发布日期:2007-01-10
  • 通讯作者: 江志裕

Preparation and Properties of LiFePO4/C Composite Materials with Fe2O3 as Starting Reactant

WANG Guan, SU Gang, YAN Man-Ming, CAI Wen-Bin, JIANG Zhi-Yu   

  1. Department of Chemistry, Shanghai Key Laboratory of Molecular Catalysis and Innovative Materials, Fudan University, Shanghai 200433, China
  • Received:2006-02-09 Revised:1900-01-01 Online:2007-01-10 Published:2007-01-10
  • Contact: JIANG Zhi-Yu

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摘要： 以Fe2O3为铁源原料, 利用热还原法成功地制备了LiFePO4/C复合材料. 用XRD以及SEM对材料的晶体结构以及表面形貌进行了表征. 通过循环伏安和充放电测试研究了材料的电化学性能. 研究结果表明， 于700 ℃下制备的LiFePO4/C复合材料在0.1C的倍率下可以得到放电容量144.8 mA·h/g, 在循环160次后, 容量仍保持在141.4 mA·h/g. 这种以廉价的Fe2O3代替目前常用的二价铁盐原料方法, 具有减少LiFePO4合成成本的优点.

关键词: Fe2O3； LiFePO4； 锂离子电池

Abstract: LiFePO4 was considered as a new kind of cathode material candidate for lithium ion batteries due to its advantages. LiFePO4/C composites were successfully prepared from Fe2O3 via solid state reaction by a thermal reduction method in Ar+5%(volume fraction) H2 atmosphere. The crystal structure and electrochemical behavior of the materials were investigated using XRD, SEM, CV and charge/discharge cycle measurements. Based on the results of TGA-DTA, LiFePO4/C composites were synthesized at different temperatures, and it was found that the LiFePO4/C composites synthesized at 700 ℃ with 8.76% mass fraction carbon content presented the initial discharge capacity of 144.8 mA·h/g at 0.1C, and after 160 cycles, the capacity remained as 141.4 mA·h/g. The method is available due to the low cost of Fe2O3 instead of using bivalent ferrous compound.

Key words: Fe2O3, LiFePO4, Lithium ion battery

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