Orthorhombic LiMnO2 (o-LiMnO2) was prepared under hydrothermal conditions using sol-gel derived Mn2O3 and LiOH as precursors and the effects of hydrothermal reaction parameters such as reaction temperature and LiOH and Mn2O3 concentrations on the phase purity of o-LiMnO2 were studied. The as-prepared samples were characterized by X-ray diffraction (XRD), field emission scanning electron microscopy (FESEM), and galvanostatic charge-discharge tests. Phase purity of o-LiMnO2 was affected by hydrothermal temperature and LiOH and Mn2O3 concentrations. High LiOH concentration facilitated the synthesis of pure phase o-LiMnO2. Low reaction temperature, lower than 140 °C, did not lead to the formation of pure phase of o-LiMnO2. Galvanostatic charge-discharge test results showed that pure o-LiMnO2 had larger discharge capacity than the mixed phases of o-LiMnO2 and Li2MnO3. However, the cycling performance of the mixed phases of o-LiMnO2 with Li2MnO3 was found to be better than that of pure o-LiMnO2.
All Science Journal Classification (ASJC) codes
- Electronic, Optical and Magnetic Materials
- Ceramics and Composites
- Process Chemistry and Technology
- Surfaces, Coatings and Films
- Materials Chemistry