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 transformat.ion from orthorhombic LiMnO2 to defect-type spinel LiMn2O4 with minor Li2MnO3, which resulted in the capacity fading during cycling.
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