| Popis: |
LiFePO4/C materials were synthesized by spray-drying using FePO4·2H2O, LiOH·H2O as raw materials, with three kinds of organic carbon sources: soluble starch, crystal sugar and glucose. The particle size, tap density, specific surface area, morphology, structure and electrochemical properties of the LiFePO4/C were tested and analyzed. The results indicate that the organic carbon source has no effect on the phase of LiFePO4, but has a remarkable influence on the tap density and specific surface area of LiFePO4. The LiFePO4/C synthesized with crystal sugar and glucose has higher tap density, smaller particle size and specific surface area. The LiFePO4/C synthesized with the glucose as the carbon source exhibited the most excellent electrochemical performance. The discharge capacities are 160.6, 148.5 and 114.1mAh/g respectively at 0.1C, 1C and 5C. Under low temperature 253K, the discharge capacity is 56.2% of that at 298K with 0.2C. |
