Hydrothermal synthesis and electrochemical performance of multicomponent LiMn0.8Fe0.19Mg0.01PO4

Multicomponent olivine LiMn0.8Fe0.19Mg0.01PO4 is hydrothermally synthesized in a Li-excess reaction system. Our synthesis experiments show that undesirable oxidation obviously occurs during synthesis in an air atmosphere, and the obtained product exhibits poor electrochemical performance. In contrast, undesirable oxidation can be effectively suppressed during synthesis in a N-2 atmosphere. Thus, the electrochemical performance of the hydrothermal product is significantly improved. When the hydrothermally synthesized LiMn0.8Fe0.19Mg0.01PO4 is composited with carbon, increasing the sintering temperature from 600 to 700 degrees C can vastly improve the electrochemical performance of the composite, and a more continuous electron-conducting network can be formed in the LiMn0.8Fe0.19Mg0.01PO4/C composite when sucrose is used as the carbon source instead of carbon black. Thus, the composite derived from sucrose can exhibit better performance at a lower carbon content.

Automated summary

Hydrothermal synthesis of multicomponent olivine LiMn0.8Fe0.19Mg0.01PO4 in a Li-excess reaction system shows improved electrochemical performance when synthesized in a N-2 atmosphere, suppressing undesirable oxidation. Additionally, increasing the sintering temperature and using sucrose as the carbon source can further enhance the performance of the LiMn0.8Fe0.19Mg0.01PO4/C composite.