Effect of Heating Time on the Structural and Electrochemical Properties of LiFePO4 by Molten Salt Method
Well-crystallized LiFePO4 cathode materials were synthesized by NaCl-KCl molten salt method. The effect of heating time on the structure, morphology and electrochemical properties of the materials were studied in detail. Single olivine-type LiFePO4 phase was obtained, and the morphology and particle size of the powders could be controlled by changing the synthesis conditions. It was shown that LiFePO4 cathode material synthesized at 680°C for 3h with the salt content N=2 (defining the molar ratio of NaCl-KCl/LiFePO4 as N) had a narrow particle-size distribution and spherical or quasi-spherical shape. Meanwhile, the tap density of the cathode material reached the maximum of 1.501gcm-3. The charge-discharge test indicated that the initial charge and discharge specific capacity reached 138mAhg-1 and 125mAhg-1 respectively at the current density of 0.3mAcm-2.
Wei Pan and Jianghong Gong
Z. G. Zou et al., "Effect of Heating Time on the Structural and Electrochemical Properties of LiFePO4 by Molten Salt Method", Key Engineering Materials, Vols. 368-372, pp. 299-301, 2008