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电化学(中英文) ›› 2006, Vol. 12 ›› Issue (3): 315-318. 

• 研究论文 • 上一篇    下一篇

Zr~(4+)离子掺杂对LiFePO_4结构及电化学性能的影响

阮艳莉;唐致远;   

  1. 天津大学化工学院应用化学系,天津大学化工学院应用化学系 天津300072,天津300072
  • 收稿日期:2006-08-28 修回日期:2006-08-28 出版日期:2006-08-28 发布日期:2006-08-28

Effects on the Structure and Electrochemical Performance of LiFePO_(4) by Zr~(4+) Doping

RUAN Yan-li,TANG Zhi-yuan~   

  1. (*)(Department of Applied Chemistry,School of Chemical Engineering andTechnology,Tianjin University,Tianjin 300072,China
  • Received:2006-08-28 Revised:2006-08-28 Published:2006-08-28 Online:2006-08-28

摘要: 应用固相反应法于惰性气氛下合成掺Zr的L iFePO4正极材料.考察Zr4+掺杂浓度对于目标化合物结构及其电化学性能的影响.XRD,交流阻抗和恒流充放电测试等实验表明,少量的Zr4+掺杂并未影响目标材料产物的结构,反而有利于降低L iFePO4电荷转移反应的阻抗,从而有利于克服该电极过程中的动力学限制.该正极材料表现出优良的倍率放电性能,在0.1C倍率下,L i0.99Zr0.01FePO4的首次放电比容量达135.6mAh.g-1.30次循环后,容量衰减仅3.8%.

关键词: 磷酸铁锂, 正极材料, 掺杂, 电化学性能

Abstract: Stoichiometric Zr-doped lithium iron phosphate(LiFePO_(4)) cathode material was synthesized by a solid-state reaction in an inert atmosphere.The effects of doping content on the physical and electrochemical properties of as-synthesized cathode materials were investigated.The samples were characterized by powder X-ray diffraction(XRD),and their electrochemical performance was systematically measured by impedance response and constant current charge/discharge cycling tests.The results indicate that the low concentration Zr~(4+)doping does not affect the structure of the material but considerably improves its kinetics in terms of capacity delivery and cycle performance.At 0.1C discharging rate,the reversible specific capacities of the Li_(0.99)Zr_(0.01)FePO_(4)cathode material is 135.6mAh g~(-1).After 30 cycles,the capacity fade was only 3.8%.The cathode material also displays a better rate performance.

Key words: LiFePO_(4), Cathode material, Doping, Electrochemical performance

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