Electrochemical performance and stability of LiMn0.6Fe0.4PO4/C composite

Fe-substituted lithium manganese phosphate (LiMn0.6Fe0.4PO4/C), with a small particle size of 50 nm in diameter, is successfully prepared using a two-step sol-gel method. TEM analysis reveals that LiMn0.6Fe0.4PO4 particles are embedded in a porous carbon matrix, and carbon interconnected particles to form a secondary spherical-like morphology. The composite prepared in this study exhibits excellent electrochemical behavior in terms of specific capacities and rate cycling ability. Furthermore, the XPS spectral studies before and after aging test reflect the much lower surface reactivity of the LiMn0.6Fe0.4PO4/C towards 1.5 M LiPF6 solutions. And the results also reveal the good stability of electrolyte/carbon interface.