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化学学报
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化学学报 ›› 2005, Vol. 63 ›› Issue (11): 1028-1032. 上一篇    下一篇

研究论文

流变相法合成LiNi0.85Co0.15O2的结构与电化学性能

陈宏浩，詹晖，朱先军，周运鸿*   

  1. (武汉大学化学与分子科学学院 武汉 430072)
  • 投稿日期:2004-06-15 修回日期:2005-01-20 发布日期:2010-12-10
  • 通讯作者: 周运鸿

Structure and Electrochemical Performance of LiNi0.85Co0.15O2 Synthesized via a Rheological Phase Method

CHEN Hong-Hao, ZHAN Hui, ZHU Xian-Jun, ZHOU Yun-Hong*   

  1. (College of Chemical and Molecule Science, Wuhan University, Wuhan 430072)
  • Received:2004-06-15 Revised:2005-01-20 Published:2010-12-10
  • Contact: ZHOU Yun-Hong

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以一种新型的软化学方法——流变相法, 成功地合成了锂离子电池正极材料LiNi0.85Co0.15O2. 将在600～850 ℃氧气氛下处理6 h后得到的LiNi1－yCoyO2 (y＝0.10, 0.15, 0.20, 0.25), 进行X射线粉末衍射(XRD)与电化学测试. 测试结果表明, 流变相前体经过800 ℃烧结后合成的LiNi0.85Co0.15O2晶胞参数a＝0.2866 nm, c＝1.4193 nm及晶胞体积V＝0.1010 nm3, 以0.1 C倍率在3.0～4.3 V (vs. Li＋/Li)放电时, 首次放电容量可以达到198.2 mAh/g, 20次循环后, 其放电容量仍在174 mAh/g以上.

关键词: 流变相, 锂离子电池, 正极材料, LiNi0.85Co0.15O2

A rheological phase method was employed successfully to synthesize LiNi0.85Co0.15O2 cathode materials for lithium-ion batteries. LiNi1－yCoyO2 (y＝0.10, 0.15, 0.20, 0.25) compounds were calcined for 6 h at 600～850 ℃ under flowing oxygen. And these samples were characterized by powder X-ray diffraction (XRD) and electrochemical tests. Lattice parameters from XRD patterns of LiNi0.85Co0.15O2 calcined at 800 ℃ show that a＝0.2866 nm, c＝1.4193 nm and the lattice volume V＝0.1010 nm3. The first discharge capacity of LiNi0.85Co0.15O2 synthesized at 800 ℃ for 6 h was 198.2 mAh/g, and the 20th discharge capacity was still above 174 mAh/g, at a 0.1 C rate between 3.0～4.3 V (vs. Li＋/Li).

Key words: rheological phase method, lithium-ion battery, cathode material, LiNi0.85Co0.15O2