Improved Electrochemical Performance of Nd3+- Doped LiNi0.5Mn1.5O4 Cathode Material for 5 V Lithium-Ion Batteries

Spinel powders of Nd-doped LiNi0.5NdxMn1.5−xO4 with different Nd3+ contents (x = 0, 0.01, and 0.02) have been synthesized by a solid-state ball milling method. The samples was characterized by XRD, SEM and EDS. XRD shows the doping of Nd3+ did not destroy the formation of spinel LNMO.The results show that LiNi0.5Nd0.01Mn1.49O4 sample exhibits a higher rate performance with specific discharge capacities of 134.8, 137.2, 136.5, 130.4, 123.8, 106.4, and 83.1 mAh g−1 at 0.2, 0.5, 1, 2, 3, 5, and 7 C (1 C = 140 mAh g−1), respectively. The results indicate that the Nd3+ doping could reduce the electrode polarization and enhance the rate capacities.