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无机材料学报

无机材料学报

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柠檬酸凝胶燃烧法合成新型LiCoVO4锂离子电池阴极材料

麦立强; 陈文; 徐庆; 朱泉峣   

  1. 武汉理工大学材料科学与工程学院 武汉 430070
  • 收稿日期:2002-08-15 修回日期:2002-09-26 出版日期:2003-09-20 网络出版日期:2003-09-20

Citrate-gel-combustion Synthesis of LiCoVO4 as Novel High-voltage Cathode Material for Li-ion Batteries

MAI Li-Qiang; CHEN Wen; XU Qing; ZHU Quan-Yao   

  1. Institute of Materials Science and Engineering; Wuhan University of Technology; Wuhan 430070; China）
  • Received:2002-08-15 Revised:2002-09-26 Published:2003-09-20 Online:2003-09-20

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摘要： 研究了一种制备锂离子电池阴极材料的新方法,通过柠檬酸凝胶燃烧法制备出高电压阴极材料LiCoVO4,并采用DSC、TG、XRD、IR、Raman、SEM、EDAX和模拟电池组装等测试方法对合成材料进行了表征和测试.结果表明高结晶单相LiCoVO4在450℃形成. LiCoVO4位于820cm-1处的红外吸收带和拉曼吸收带分别归属于VO4四面体具有A1对称的伸缩振动和VO4四面体中V-O键振动的内模振动峰,而335cm-1处的红外和拉曼吸收带则对应于VO4四面体具有E对称的变角振动.产物一次粒子平均粒径为300nm,粒径分布和元素分布基本均匀.产物的首次充电容量为160mAh·g-1,充电平台电压为4.8V,放电容量为152mAh·g-1,具有较好的电化学性能.

关键词: LiCoVO4, 柠檬酸凝胶燃烧法, 电化学性能, 阴极材料

Abstract: A new method by combining Chimie Douce method with sol-gel route and using citrate as complex reagent was introduced for preparing inverse spinel
LiCoVO4 as novel high-voltage cathode material for Li-ion batteries. Investigations were conducted by XRD, DSC and TG, IR, Raman, SEM and EDAX, and electrochemical techniques. The results of XRD and thermal analysis
show the high crystalline LiCoVO4 with high phase purity are formed at 450℃. The results of the IR and Raman investigations show
the band located at ～820cm-1 corresponding to the stretching vibration mode with the A1 symmetry, whereas the band situated at ～335cm-1 corresponding
to the bending mode of the VO4 tetrahedron with E symmetry. The SEM and EDAX results show that the average diameter of the original particles is
300nm and the distributions of particle diameter and elements are even. Electrochemical measurement shows that the initial charge capacity is
160mAh·g-1 with the platform voltage of 4.8V and its discharge capacity is 152mAh·g-1.

Key words: LiCoVO4, novel citrate-gel-combustion method, electrochemical performance, cath-ode materials

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