The prepared and electrochemical property of Mg-doped LiMn0.6Fe0.4PO4/C as cathode materials for lithium-ion batteries

Driven by the demand for high-performance lithium-ion batteries, improving the energy density and high rate discharge performance is the key goal of current battery research. Here, Mg-doped LiMn0.6Fe0.4PO4 (LMFP) cathode materials are synthesized by the solid-phase method. The effects of different doping amounts of Mg on the microstructure and electrochemical properties of LMFP materials were studied. The results show that Mg is successfully doped into LMFP to reduce the lattice volume. Large doping of Mg will distort the lattice. LiMn0.6Fe0.39Mg0.01PO4/C has the best electrochemical performance, with a discharge capacity of 159.6 mAh g(-1) at 0.2 C and 124.5 mAh g(-1) even at 10 C. EIS shows that the electrochemical impedance of the sample is significantly reduced and the diffusion coefficient of lithium-ion is increased after the doping of proper amount of Mg. The successful synthesis of the material provides a reference for the preparation of high rate discharge cathode materials.