Electrochemical Properties of Mn-Doped Nanosphere LiFePO4

LiFePO4 with an olivine structure has attracted extensive interest as a cathode material for rechargeable lithium batteries. However, due to the inherent low ionic and low conductivity of LiFePO4, its electrochemical performance still has a lot of room for improvement. LiMnxFe1−xPO4 (x = 0, 0.10, 0.18, 0.50) materials with different Mn doping amounts were synthesized by a solvothermal method. The experimental results show that the initial discharge specific capacities of LiMn0.1Fe0.9PO4 at 0.1 C and 0.5 C are 142.8 mAh g−1 and 123.4 mAh g−1, respectively. The synthesized olivine LiMn0.1Fe0.9PO4/C composite has better electrochemical properties. The initial discharge capacity of the composite reaches 151.9 mAh g−1 at 0.1 C rate and 105.1 mAh g−1 at 2 C rate. The improvement of electrochemical performance is attributed to the columnar effect of the Mn-stabilized crystal structure and the lithium-ion diffusion rate caused by Mn doping.