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.
