高等学校化学学报

高等学校化学学报 ›› 2002, Vol. 23 ›› Issue (6): 1100.

• 研究论文 • 上一篇    下一篇

以不同二氧化锰为原料制备的锂锰氧化物的性能研究

詹晖, 周运鸿   

  1. 武汉大学化学与分子科学学院, 武汉 430072
  • 收稿日期:2000-08-23 出版日期:2002-06-24 发布日期:2002-06-24
  • 通讯作者: 周运鸿(1940年出生),男,教授,博士生导师,从事电化学和化学电源的研究.E-mail:yhzhou@whu.edu.cn E-mail:yhzhou@whu.edu.cn
  • 基金资助:

    国家自然科学基金(批准号:29833090)资助

Studies on the Properties of Li-Mn Oxide Made from Various CMD

ZHAN Hui, ZHOU Yun-Hong   

  1. College of Chemistry & Molecule Science, Wuhan University, Wuhan 430072, China
  • Received:2000-08-23 Online:2002-06-24 Published:2002-06-24

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被引次数

23

摘要： 用几种典型的化学方法合成了8种CMD材料,并以其作锰源,制得锂锰氧化物.通过X射线衍射技术对CMD和锂锰氧化物的结构进行了分析.电化学实验结果显示,除了CMD的结构外,它的组成和其中的碱金属离子含量对锂锰氧化物的性能同样具有重大的影响.即使是属于相同类型的CMD材料,由于合成方法不同,其它离子的引入使材料的局部或微观结构发生变化,最终得到的锂锰氧化物的电化学行为出现差异.δ-MnO2虽然具有大隧道结构,但其结构的热不稳定性并不适于作为高温合成锂锰氧化物的锰源.

关键词: 化学二氧化锰, 锂锰氧化物, 碱金属离子, &delta, -MnO2

Abstract: Eight typical ways were used to synthesize chemical manganese dioxide(CMD) from which eight types of Li-Mn oxide were prepared. The structures of CMDand Li-Mn oxide were all investigated by XRDexperiment. The results of the electrochemical characterization show that except the structure type, the composition of CMDwhich was used in the preparation can also have a significant influence on the electrochemical performance of the final product—Li-Mn oxide. Even the CMDmaterial was of the same type, the difference under the synthesizing condition could bring out some microcosmic or local change in the structure, which may finally cause the great difference in the electrochemical behavior. Because of its instability at the high temperature, δ-MnO2 was unsuitable to be used as the manganese source for the preparation of the spinel material, although it was characteristic of large tunnel in its structure.

Key words: CMD, Li-Mn oxide, Alkaline cation, δ-MnO2

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