锂电池正极材料Li_(1.06)Mn_(0.8)Cr_(0.14)O_2的水热合成及其光谱研究  

Hydrothermal Synthesis and Spectroscopic Studies of Li_(1.06)Mn_(0.8)Cr_(0.14)O_ 2

作　　者：赵立竹[1] 陈岗[1] 张丽娟[1] 

机构地区：[1]吉林大学材料科学与工程学院

出　　处：《高等学校化学学报》2006年第10期1815-1818,共4页Chemical Journal of Chinese Universities

基　　金：国家'九七三'计划(批准号:2002CB211802);教育部科学技术研究重大项目(批准号:重大10411);吉林省基础研究计划(批准号:20030504)资助.

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.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 Mn^3＋ This result should restrain Jahn-Teller effect and trend a stable structure for the material.

关 键 词：水热合成 六方Li1.06Mn0.8Cr0.14O2 JAHN-TELLER畸变 

分 类 号：O614[理学—无机化学]