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铁道科学与工程学报

JOURNAL OF RAILWAY SCIENCE AND ENGINEERING

Vol. 13    No. 5    October 2003

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Effect of Cr doping on structure of LiMnO2
GU Yi-jie(谷亦杰), ZHOU Heng-hui(周恒辉),
CHEN Ji-tao(陈继涛), CHANG Wen-bao(常文保)

College of Chemistry and Molecular Engineering,
Peking University, Beijing 100871,China

Abstract:The monoclinic and orthorhombic ordered-rocksalt polymorphs of LiMnO↓2 are of interest as high-capacity cathode materials for rechargeable Li batteries. LiMnO2 and LiMn1-xCrxO2 were prepared by a high temperature solid-state route. In comparison with undoping Cr orthorhombic LiMnO2, monoclinic LiMnO2 was preserved with Cr doping. The volume of m-LiMnO2 decreasing with increasing Cr confirms that the length of bond around Cr ion decreases with Mn substituted by Cr ion. A phase transformation mechanism was proposed for understanding the structure relationship between the LiMnO2 and chromium-substituted LiMnO2 oxides.

 

Key words: LiMnO2; Cr doping; phase transformation mechanism

ISSN 1672-7029
CN 43-1423/U

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