高等学校化学学报

高等学校化学学报

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锂电池正极材料Li1.06Mn0.8Cr0.14O2的水热合成及其光谱研究

赵立竹1,2, 陈岗1, 张丽娟1   

    1. 吉林大学材料科学与工程学院, 长春 130012;
    2. 东北师范大学物理学院, 长春 130024
  • 收稿日期:2005-10-21 修回日期:1900-01-01 出版日期:2006-10-10 发布日期:2006-10-10
  • 通讯作者: 陈岗

Hydrothermal Synthesis and Spectroscopic Studies of Li1.06Mn0.8Cr0.14O2

ZHAO Li-Zhu1,2, CHEN Gang1, ZHANG Li-Juan1   

    1. College of Materials Science and Engineering, Jilin University, Changchun 130012, China;
    2. College of Physics, Northeast Normal University, Changchun 130024, China
  • Received:2005-10-21 Revised:1900-01-01 Online:2006-10-10 Published:2006-10-10
  • Contact: CHEN Gang

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摘要： 采用水热方法合成了掺铬锂锰氧化合物, X射线衍射和Raman光谱分析结果表明, 所得材料为具有NaFeO2结构的晶体. 由等离子发射光谱(CIP)确定其组分为Li1.06Mn0.8Cr0.14O2. X射线光电子能谱(XPS)研究结果表明, 与未掺杂的LiMnO2相比, 所得材料中Mn的平均价态增加, 这将抑制因Mn3+离子的存在而产生的Jahn-Teller畸变, 有利于提高材料的电化学循环性能.

关键词: 水热合成, 六方Li1.06Mn0.8Cr0.14O2, Jahn-Teller畸变

Abstract: The Cr-doped lithium manganese oxide was prepared by the hydrothermal technique. Structural characterization based on X-ray diffraction and Raman spectroscopy reveals that Li1.06Mn0.8Cr0.14O2 possesses a hexagonal crystal structure which is much favorable for improving electrochemical properties of the material. X-ray photoelectron spectroscopy(XPS) shows that the average oxidation state of Mn of the layered Li1.06Mn0.8Cr0.14O2 is more than Mn3+. This result should restrain Jahn-Teller effect and trend a stable structure for the material.

Key words: Hydrothermal synthesis, Hexagonal Li1.06Mn0.8Cr0.14O2, Jahn-Teller distortion

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