Hydrothermal Synthesis and Electrochemical Behavior of Nanosized Orthorhombic LiMnO2
摘要
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.