Comparative study of LiNi0.05Mn1.95O4 powders prepared by different materials for Li-ion battery

LiNi_0.05Mn_1.95O₄ powders were prepared by manganese tetraoxide (MTO) and electrolytic manganese dioxide (EMD). The phase identification, surface morphology, and electrochemical properties of the prepared powders were studied by X-ray diffraction, scanning electron microscopy, cyclic voltammetry, and galvanostatic charge?Cdischarge experiments. Compared to LiNi_0.05Mn_1.95O₄ powders prepared by EMD, LiNi_0.05Mn_1.95O₄ powders prepared by MTO show better crystallinity. Both powders possess a typical cubic structure with uniform particle size. The specific capacity and coulombic efficiency of LiNi_0.05Mn_1.95O₄ powders prepared by MTO are higher than the one prepared by EMD. The capacity retention of LiNi_0.05Mn_1.95O₄ powders prepared by MTO cycled 30 times at room temperature and 55?°C are 98.3% and 90.6%, respectively, which are much higher than those of 86.63% and 77.7% for the one prepared by EMD. LiNi_0.05Mn_1.95O₄ powders prepared by MTO show higher specific capacity and better cycling performance than the one prepared by EMD.