Hydrothermal Synthesis and Electrochemical Behavior of Nanosized Orthorhombic LiMnO2

Abstract

Abstract: Nanosized orthorhombic LiMnO2 was successfully synthesized using Mn2O3 and LiOH•H2O as starting materials. Not only the reaction temperature was lower, but the reaction time for synthesizing was notably shortened to 1 h. In this hydrothermal process, the cations of the starting materials were capable of mixing and interacting in ionic scale, which resulted in the rapid formation of o-LiMnO2 powders at relatively low temperature. The particle size conformed by transmission electron microscopy is around 50~150 nm. Benefiting from its small particle size and good uniformity, the obtained o-LiMnO2 can reach the maximum discharge capacity of 163 mA•h•g-1 at 0.1 C rate after several cycles. X-ray diffraction data and electrochemical properties suggested the phase transformation from orthorhombic LiMnO2 to defect-type spinel LiMn2O4 with minor Li2MnO3, which resulted in the capacity fading during cycling.

Key words: Orthorhombic LiMnO2, Hydrothermal synthesis, Mn2O3, Electrochemistry

Xiaoyan TU, Guanglie LU, Yuewu ZENG, Zhiqing YUAN, Xiurong HU. Hydrothermal Synthesis and Electrochemical Behavior of Nanosized Orthorhombic LiMnO2[J]. J Mater Sci Technol, 2005, 21(04): 552-554.

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