| 초록 |
Recently, many research groups have reported that transition metal-substituted spinel materials (LiMn2-xMxO4, M = Cr, Co, Fe, Ni) showed a higher voltage plateau at around 5V. Among them, LiMn1.5Ni0.5O4 especially has good electrode performance. LiMn1.5Ni0.5O4 cathodes usually exhibit two plateaus around 4.3V and 4.7V, corresponding to the redox reactions of Mn3+/Mn4+ and Ni2+/Ni4+ redox couples, respectively. Co-precipitation method is a simple route to prepare fine, well-crystallized, high purity and homogeneous powders of single or multi-component oxide. In this study, the nanorod shpaped LiMn1.5Ni0.5O4 cathode powders were prepared by co-precipitation method with oxalic acid. Oxalic acid was added into the solution to control the morphologies of LiMn1.5Ni0.5O4 cathode powders. In addition, the use of oxalic acid further improved the electrochemical properties. The effects of the ratios of oxalic acid to metal on the characteristics of LiMn1.5Ni0.5O4 cathode powders prepared by co-precipitation are investigated. The structure and electrochemical properties of this cathode powders were characterized by XRD, SEM, and charge-discharge test. |
