The synthesis of LiFePO4/C with polyaniline as coated carbon source and sucrose as reducing carbon source

LiFePO4/C was prepared by the carbothermal reduction method with FePO4/polymer prepared by in situ polymerization-precipitation method as raw material. The effects of carbonization temperature of carbon source and its graphitization degree on the electrochemical properties of LiFePO4/C were investigated. Particle size, morphology, structure, and electrochemical properties of the prepared material were characterized. The carbonization temperature of the coated carbon source should be higher than the lithium reaction temperature and the carbonization temperature of the reduction carbon source to ensure that the carbonization product of the coated carbon source was not consumed by the lithium reaction. The addition of monomer should be beneficial to control the particle size and morphology of the precursor, as well as the thickness and uniformity of coated carbon layer on the LiFePO4/C. The initial discharge specific capacity was 163.7 mAh g−1 at 0.1 C, and the specific capacity retention rate was 93.7% after 50 cycles for the LiFePO4/C prepared.