Effects of Different Granularity Control Methods on Morphology, Structure and Electrochemical Performance of LiFePO<sub>4</sub>/C

LiFePO 4 /C materials were synthesized by spray-drying method. The particle size of the LiFePO 4 /C was controlled by mechanical crushing or airflow crushing. The morphology, structure and electrochemical properties of the materials were characterized. The results show that: The smaller powder particle and better particle size distribution could be got using the two granularity control methods above. The special surface area of the material increased, the tap density decreased and the high rate performance deteriorated when the particle size of LiFePO 4 /C was controlled. After the particle size of LiFePO 4 /C is controlled the contacts of LiFePO 4 /C and carbon will deteriorate. The special capacity of the material decreases and the rate performance deteriorates, due to the stripping of carbon.