Synthesis and characterization of active cathode material of LiFeSi_XP_1-xO₄/C with variation of doping Si ions

LiFeSi_xP_1-xO₄/C (x=0, 0.05, 0.1, and 0.15) has successfully synthesized by a solid-state reaction method. The material were calcinated at 700 °C then sintered at 900 °C in a Nitrogen environment. Tapioca and CH₃COOH as the carbon sources mixed with weight ratio 2:8 then carbonized at 700 ^oC in a Nitrogen environment. Characterization was performed using XRD, SEM-EDS, CV and CD tests. The result shows that the samples have a pure olivine LiFePO₄phase and the largest capacity and the excellent performance approached in the sample with x=0.15 with a specific discharge capacity of 35.51 mAh/g based on half-cell testing.