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电化学(中英文) ›› 2013, Vol. 19 ›› Issue (6): 550-557.  doi: 10.13208/j.electrochem.130362

• 锂离子电池近期研究专辑 (厦门大学 杨勇教授主编) • 上一篇    下一篇

粒径可控纳米LiFePO4/C的制备及其电化学性能研究

王明娥,刘敬源,侯孟炎,夏永姚*   

  1. 复旦大学 化学系,上海市分子催化和功能材料重点实验室,上海 200433
  • 收稿日期:2013-06-25 修回日期:2013-08-28 出版日期:2013-12-28 发布日期:2013-12-23
  • 通讯作者: 夏永姚 E-mail:yyxia@fudan.edu.cn
  • 基金资助:

    国家自然科学基金重点项目(20925312)资助

Preparation of the Particle Size Controllable LiFePO4/C and Its Electrochemical Profile Characterization

WANG Ming-e, LIU Jing-yuan, HOU Meng-yan, XIA Yong-yao*   

  1. Department of Chemistry and Shanghai Key Laboratory of Molecular Catalysis and Innovative Materials, Fudan University, Shanghai 200433, China
  • Received:2013-06-25 Revised:2013-08-28 Published:2013-12-28 Online:2013-12-23
  • Contact: XIA Yong-yao E-mail:yyxia@fudan.edu.cn

摘要: LiFePO4电极的倍率特性与材料的粒度和电子导电性有很大关系. 采用共沉淀方法,调控预处理温度,将3种不同尺寸的FePO4前驱体通过表面修饰对-羟基苯甲酸的聚合物,可合成不同尺度的LiFePO4/C材料,分别为80 nm、200 nm和 1 μm. 纳米尺度LiFePO4-a/C电极,30C放电比容量达到了100 mAh·g-1,而微米级LiFePO4-c/C电极放电比容量仅为54 mAh·g-1. 均一碳包覆的LiFePO4/C电极表现出强抗氧化性,不仅提高其导电性,还可防止材料氧化.

关键词: LiFePO4, 锂离子电池, 正极材料, 原位合成

Abstract: We adopted an effective route to prepare the particle size controllable core-shell structure carbon-coated LiFePO4 from different sized FePO4 precursors, varying from 80 nm, 200 nm and 1 μm by an in situ polymerization method integrated with a surface modification technology. The discharge capacities of the three sized LiFePO4/C are, respectively, 162 mAh·g-1, 142 mAh·g-1 and 92 mAh·g-1 at 0.1C rate. The nano-sized LiFePO4-a/C (80 nm) delivers a discharge capacity as large as 100 mAh·g-1 even at 30C, while the macroscopic LiFePO4-c/C (1 μm) exhibits a much poorer discharge capacity of 54 mAh·g-1 under the same current density. The carbon coated LiFePO4 (LiFePO4/C) also shows good chemical stability after the exposure to air atmosphere, in which the uniform carbon layer could prevent the LiFePO4 from reacting with H2O and O2.

Key words: LiFePO4 , Lithium-ion batteries, cathode materials, in-situ synthesis

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