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电化学(中英文) ›› 2003, Vol. 9 ›› Issue (1): 9-14. 

• 研究论文 • 上一篇    下一篇

LiFePO_4新型正极材料电化学性能的研究

施志聪,李晨,杨勇   

  1. 厦门大学化学系固体表面物理化学国家重点实验室,厦门大学化学系固体表面物理化学国家重点实验室,厦门大学化学系固体表面物理化学国家重点实验室 福建厦门361005 ,福建厦门361005 ,福建厦门361005
  • 收稿日期:2003-02-28 修回日期:2003-02-28 出版日期:2003-02-28 发布日期:2003-02-28

The Electrochemical Performance Studies on Novel LiFePO_4 Cathode Materials for Li_ion Batteries

SHI Zhi_cong,LI Chen,YANG Yong*Chemistry, Xiamen University, Xianmen 361005, China)   

  • Received:2003-02-28 Revised:2003-02-28 Published:2003-02-28 Online:2003-02-28

摘要:  采用固相反应结合高速球磨法,合成了锂离子电池新型正极材料LiFePO4,并对该材料进行碳包覆处理;采用XRD、SEM、元素分析以及价态化学分析等方法对样品进行表征.实验表明,LiFePO4具有3.4V的放电电压平台,而且包覆碳后的磷酸铁锂具有更好的电化学性能,首次放电容量达147mAh/g,充放电循环100次后容量只衰减9.5%.

关键词: 锂离子电池, 正极材料, 磷酸铁锂, 电化学性能

Abstract: The cathode materials of LiFePO4 and LiFePO4 coated with carbon were synthesized by means of solid state reaction and ballmilling. The samples were characterized by X_ray diffraction, scanning electron microscopy, gas_phase element analysis and titration analysis methods. Electrochemical tests of two kinds of materials showed that both of them exhibit a 3.4V discharge voltage plateau, however,the coated samples demonstrated the improved performance in terms of discharge capacity and cyclic stability.

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