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化学学报
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化学学报 ›› 2005, Vol. 63 ›› Issue (16): 1500-1504. 上一篇    下一篇

研究论文

不同碳源对LiFePO4/C复合正极材料性能的影响

唐致远*, 阮艳莉   

  1. (天津大学化工学院应用化学系 天津 300072)
  • 投稿日期:2004-09-28 修回日期:2005-04-14 发布日期:2010-12-10
  • 通讯作者: 唐致远

Effects of Different Carbon Source on the Performance of LiFePO4/C Composite Cathode Material

TANG Zhi-Yuan*,RUAN Yan-Li   

  1. (Department of Applied Chemistry, School of Chemical Engineering and Technology, Tianjin University, Tianjin 300072)
  • Received:2004-09-28 Revised:2005-04-14 Published:2010-12-10
  • Contact: TANG Zhi-Yuan

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采用固相反应法在惰性气氛下合成了橄榄石型LiFePO4/C复合正极材料. 采用XRD, SEM和激光粒度分布(LSD)以及电化学测试等手段对目标材料进行了结构表征和性能测试. 考察了葡萄糖、乙炔黑以及石墨等不同碳源对目标材料性能的影响. 结果表明, 以葡萄糖作为碳源的正极材料具有优良的电化学性能, 首次放电比容量达142.5 mAh/g, 循环30次后, 容量衰减只有2.5%. 分析了不同碳源对目标材料性能影响的原因.

关键词: 碳源, 磷酸亚铁锂, 橄榄石型, 正极材料

Olivine LiFePO4/C composite cathode materials were synthesized by a solid state method in an inert atmosphere. The crystal structure and the electrochemical performance were characterized by XRD, SEM, laser particle-size distribution measurement and electrochemical performance testing. The effects of different carbon source, such as dextrose, acetylene black and graphite, on the performance of as-synthesized cathode materials were investigated and the causes also analyzed. The results demonstrated that the composite material carbon-doped by dextrose had the most excellent electrochemical performances. The initial discharge capacity, namely 142.5 mAh/g, was delivered at room temperature and C/20 discharge rate. After 30 cycles, the capacity fade was only 2.5%.

Key words: carbon source, lithium iron(II) phosphate, olivine, cathode material