Enhancing the electrochemical performance of LiNi_0.5Mn_1.5O₄ cathode material by Li⁺/F⁻ co-doping

Abstract A solid-state ball-milling method was used to prepare the Li+/F− co-doped LiNi0.5Mn1.5O4 materials. XRD characterizations reveal that the Li+/F− co-doping decreases the LixNi1-xO impurities contents and enhances the structural stability. It can be seen from SEM analysis that the crystal morphology of LiNi0.5Mn1.5O4 material changes into a phase octahedron morphology because of Li+/F− co-doping. The electrochemical performance tests results show Li1.03Ni0.5Mn1.5O3.97F0.03 material possesses a higher rate capability. Specifically, the discharge capacity of Li1.03Ni0.5Mn1.5O3.97F0.03 material at 2, 3, 5, and 7 C-rate was 127.3, 120.4, 103.3 and 79.0 mAh·g−1, respectively, while that of the Pure LNMO yields only 117.7, 109.8, 88.3 and 54.2 mAh·g−1.