Study on the electrochemical performance of LiNi0.5Mn1.5O4 with different precursor

LiNi0.5Mn1.5O4 cathodes were synthesized by three different raw materials at high temperature. The samples were characterized by X-ray diffraction and scanning electron microscopy tests, respectively. The results indicate that the synthesized samples show pure spinel structure, and the samples synthesized by nickel-manganese hydrate and nickel-manganese oxide show regular geometrical shape. The electrochemical performance of sample synthesized by nickel-manganese oxide is best. The first discharge capacity is 141 mAh/g, and the capacity retention is 98.6% after 50 cycles at 0.5 C rate. The discharge capacity at 5 C rate is still 120 mAh/g. Better crystallization, smaller specific surface area, and lower polarization may be responsible for the excellent electrochemical performance of the LiNi0.5Mn1.5O4.