Effect of sintering temperature on the morphology and electrochemical properties of LiMn0.5Fe0.5PO4/C synthesized via solid state method

LiMn0.5Fe0.5PO4 cathode materials were prepared via a low-cost solid-state method and mixed with sucrose and then calcined at different temperatures. The structure, morphology, and electrochemical performance of the synthesized material were analyzed via X-ray diffraction, scanning electron microscopy-energy dispersive spectroscopy, high-resolution transmission electron microscopy, galvanostatic charge-discharge tests, cyclic voltammetry, and electrochemical impedance spectroscopy. The results showed that materials prepared via the solid-state method contained nanosized particles with a good olivine structure and exhibited excellent particle dispersibility at various sintering temperatures, resulting in high electrochemical performance. Moreover, at a high sintering temperature of 650 degrees C, the battery material exhibited the highest conductivity and lithium-ion diffusion coefficient of 150.9 O and 2.15 x10(-5) S cm(- 1), respectively. The material featured a high discharge specific capacity of 110.0 mAh g(- 1) at a current density of 5 C owing to its good dispersion and regular spherical particle morphology obtained at 650 degrees C. The electrochemical properties of battery materials were directly affected by the improvement and optimization of the parameters in the preparation process.