Synthesis and Electrochemical Properties of Molybdenum-Doped LiMn0.6Fe0.4PO4 Cathode Materials

In this paper, molybdenum-doped LiMn0.6Fe0.4PO4 cathode materials were prepared by spray drying combined with carbon thermal reduction. XRD and SEM test results showed that the doping of molybdenum was successful, and the appropriate doping amount could effectively adjust the crystal structure of the material, refine the particle size, and thus improve the diffusion rate of ions. The synthesized Mo-doped LiMn0.6Fe0.4PO4 exhibited good electrochemical properties, where the best Mo doping amount x = 0.15, reached a first discharge-specific capacity of 153.2 mAh g(-1) at 0.2 C and a discharge-specific capacity of 94.2 mAh g(-1) even at 10 C current density. The cycling performance of the material was also improved to a great extent, with a capacity retention of 91.4% after 100 cycles at 1 C. The EIS results showed that the electrochemical impedance of the material decreased significantly with the appropriate amount of Mo doping, which proved that Mo doping helped to improve the Li+ diffusion rate of the material.