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›› 2008, Vol. 8 ›› Issue (4): 808-813.

• 材料工程专栏 • 上一篇    下一篇

锂离子电池正极材料LiNi1/2Co1/6Mn1/3O2的制备与性能

国海鹏 贾梦秋 廖煜炤 翟中楠   

  1. 北京化工大学 北京化工大学材料科学与工程学院 北京化工大学材料科学与工程学院 北京化工大学材料科学与工程学院
  • 收稿日期:2008-04-17 修回日期:2008-05-26 出版日期:2008-08-20 发布日期:2008-08-20
  • 通讯作者: 贾梦秋

Synthesis and Characterization of Cathode Material LiNi1/2Co1/6Mn1/3O2 for Lithium-ion Secondary Batteries

GUO Hai-peng JIA Meng-qiu LIAO Yu-zhao ZHAI Zhong-nan   

  1. College of Materials Science and Engineering，Beijing University of Chemical Technology College of Material Science and Engineering, Beijing University of Chemical Technology College of Material Science and Engineering, Beijing University of Chemical Technology
  • Received:2008-04-17 Revised:2008-05-26 Online:2008-08-20 Published:2008-08-20
  • Contact: JIA Meng-qiu

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被引次数

9

摘要： 采用Co2+浓度递增的金属离子混合溶液分次共沉淀方法制备Ni1/2Co1/6Mn1/3(OH)2，以其为前驱体，通过高温固相反应得到具有Co含量梯度的层状LiNi1/2Co1/6Mn1/3O2，探讨了焙烧温度及Co含量梯度对材料的结构和电化学性能的影响. 通过X射线衍射、扫描电镜、热重分析及恒电流充放电测试对合成的样品进行了表征. 结果表明，700℃合成产物即具有类LiNiO2的六方层状结构，800和850℃合成产物阳离子排列有序度高，层状结构显著. 材料结晶度好，粒度均匀，粒径在亚微米级. 合成温度800℃的梯度材料具有最佳的电化学性能, 2.5~4.2 V, 0.1 C倍率充放电50次后，梯度材料的容量仍保持在171.2 mA×h/g. 相同的焙烧温度，梯度材料比均匀材料的电化学性能更加优异.

关键词: 锂离子电池正极材料, 分层结构, 梯度材料, 分次共沉淀

Abstract: n1/3(OH)2 with 5% excess LiOH×H2O followed by heat treatment. The precursor Ni1/2Co1/6Mn1/3(OH)2 was prepared via multiple co-precipitation of solutions with different compositions of Ni2+, Co2+, Mn2+. The cathode material was characterized using X-ray diffraction (XRD), scanning electron microscope (SEM), galvanostatic charge-discharge test and electrochemical impedance spectroscopy (EIS). The XRD pattern and the SEM photos of the material indicated that the layered crystal structure of the material with a-NaFeO2 type (space group R m) was perfect and its morphology was well distributed. The galvanostatic charge-discharge (0.1 C, 2.5~4.2 V, vs. Li+/Li) tests showed that not only the first discharge specific capacity of the gradient material was higher than that the homogeneous material, but its cyclic stability was improved greatly. The gradient material sintered at 800℃ delivered high discharge specific capacity of 171.2 mA×h/g after multiple cycling.

Key words: lithium ion battery cathode material, layered structure, gradient material, co-precipitation

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