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化学学报
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化学学报 ›› 2002, Vol. 60 ›› Issue (10): 1742-1746. 上一篇    下一篇

研究论文

LiNi_(0.85)Co_(0.15)O_2合成和结构与电化学性能关系

朱先军;詹晖;周运鸿   

  1. 武汉大学化学与分子科学学院,武汉(430072)
  • 发布日期:2002-10-15

Synthesis, Structure and Electrochemical Behavior of LiNi_(0.85)Co_ (0.15)O_2

Zhu Xianjun;Zhan Hui;Zhou Yunhong   

  1. College of Chemistry & Molecular Sciences, Wuhan University,Wuhan (430072)
  • Published:2002-10-15

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介绍了一种以LiOH·H_2O, Co_2O_3和Ni_2O_3为原料通过高温法合成LiNi_(0. 85)Co_(0.15)O_2的方法，通过XRD和电化学测试对制得的产物进行了表征，讨论了 合成条件对产物结构的影响以及结构与电化学性能之间的关系。实验结果表明，合 成反应温度、Li/Ni/Co摩尔比对LiNi_(0.85)Co_(0.15)O_2的结构和电化学性能有 较大的影响，合成出具有电化学活性的LiNi_(0.85)Co_(0.15)O_2需要严格控制反 应条件。本文合成出具有高度结晶层状结构的LiNi_(0.85)Co_(0.15)O_2, Rietveld精化结果表明a = 0.2874 nm, c = 1.4229 nm，最大晶胞体积V = 0. 10180 nm~3，其首次放电容量可达197 mA·h/g, 15次循环后，其放电容量仍在 180 mA·h/g以上。

关键词: 锂离子, 电池, 电极, 氧化锂, 氧化镍, 氧化钴, X射线衍射分析, 晶体结构

LiNi_(0.85)Co_(0.15)O_2 compounds were synthesized under various conditions by heating a mixture of lithium hydroxide (LiOH·H_2O), nickel oxide (Ni_2O_3) and cobalt oxide (Co_2O_3). The products of LiNi_(0.85)Co_(0.15)O_2 were characterized by XRD and electrochemical tests. Based on the experimental results, the influence of synthetic conditions, including temperature and Li/Ni/Co molar ratio on the structure of the products, and the relationship between structure and electrochemical behavior are discussed. It is important to control synthetic conditions in order to obtain layered and highly crystallized product. By Rietveld refinement, the asprepared product shows a = 0.2874 nm, c = 1.4229 nm, and maximum cell volume V = 0. 10180 nm~3 and it also shows a high initial discharge capacity of 197 mA·h/g and retention of over 180 mA·h/g after 15 cycles.

Key words: LITHIUM ION, BATTERIES, ELECTRODE, LITHIUM OXIDE, NICKEL OXIDE, COBALT OXIDE, XRD, CRYSTAL STRUCTURE

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