物理化学学报 >> 2011, Vol. 27 >> Issue (10): 2347-2352.doi: 10.3866/PKU.WHXB20110905

电化学和新能源 上一篇    下一篇

前驱体配料温度对水热法制备LiFePO4的影响

赵浩川1, 宋杨1, 郭孝东1, 钟本和1, 董静1, 刘恒2   

  1. 1. 四川大学化学工程学院, 成都 610065;
    2. 四川大学材料科学与工程学院, 成都 610064
  • 收稿日期:2011-04-25 修回日期:2011-06-19 发布日期:2011-09-27
  • 通讯作者: 钟本和 E-mail:Zhongbenhe@hotmail.com
  • 基金资助:

    国家科技支撑计划(2007BAQ01055)资助项目

Effect of Precursor Ingredient Temperature on the Performance of LiFePO4 by Hydrothermal Method

ZHAO Hao-Chuan1, SONG Yang1, GUO Xiao-Dong1, ZHONG Ben-He1, DONG Jing1, LIU Heng2   

  1. 1. College of Chemical Engineering, Sichuan University, Chengdu 610065, P. R. China;
    2. College of Materials Science and Engineering, Sichuan University, Chengdu 610064, P. R. China
  • Received:2011-04-25 Revised:2011-06-19 Published:2011-09-27
  • Contact: ZHONG Ben-He E-mail:Zhongbenhe@hotmail.com
  • Supported by:

    The project was supported by the National Science & Technology Pillar Program of China (2007BAQ01055).

摘要: 研究了配料温度对水热法制备磷酸铁锂的影响. 通过X 射线衍射(XRD)、扫描电镜(SEM)、循环伏安(CV)以及元素分析等手段分析了不同温度下制备的前驱体和最终的LiFePO4样品, 其结果表明配料温度对磷酸铁锂前驱体颜色和特性有明显影响. 通过仔细控制该温度可以制得高纯Li3PO4 中间体并抑制前驱体中Fe(OH)3的形成. 有利于进一步获得结晶良好不含Fe3+的LiFePO4样品, 显著提高了LiFePO4材料的放电比容量. 当配料温度为30 °C时获得的样品, 0.1C倍率下放电比容量达到156 mAh·g-1, 0.5C倍率下放电比容量为151 mAh·g-1, 10C倍率下放电比容量为127 mAh·g-1, 循环20次容量保持率达99%.

关键词: 锂离子电池, 正极, 水热法, 磷酸铁锂, 温度

Abstract: We investigated LiFePO4 particles that were prepared by a hydrothermal reaction at different ingredient temperatures. The precursors and final LiFePO4 products were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), cyclic voltammetry (CV), and elemental analysis. The results show that ingredient temperature had a significant effect on the color and characteristics of the LiFePO4 precursors. High purity Li3PO4 was obtained and the formation of Fe(OH)3 in the precursors was inhibited by controlling the ingredient temperature carefully. In addition well-crystalline and free Fe3+ LiFePO4 samples were synthesized, which greatly increased the discharge capacity of the LiFePO4 cathode materials. At an ingredient temperature of 30 °C the discharge specific capacity of the as-prepared sample was found to be 156 mAh·g-1 at 0.1C rate, 151 mAh·g-1 at 0.5C rate and it remained 127 mAh·g-1 even at a rate of 10C while the cycling retention rate was 99% after 20 cycles.

Key words: Lithium ion battery, Cathode, Hydrothermal method, LiFePO4, Temperature

MSC2000: 

  • O646