A facile precursor-separated method to synthesize nano-crystalline LiFePO4/C cathode materials

• The nano-crystalline LiFePO4 was prepared by precursor-separated method.
• The precursors were separated by packing the iron sulfate solution in polymer bag.
• The iron sulfate solution released when the temperature reached a certain value.
• The polarization was reduced and the high rate capacity was improved.
• The reaction mechanism of this method was investigated.

A facile precursor-separated hydrothermal synthesis (PSHS) method was developed to synthesize LiFePO4 nano-crystallines at low temperature where the iron sulfate solution precursor was packed in polymer film to divide it from Phosphoric acid and Lithium hydroxide before reaction. X-ray diffraction (XRD), transmission electron microscopy (TEM) and field emission scanning electron microscopy (FE-SEM) were adopted to characterize the morphology and crystal structure of the products. The electrochemical properties and conductivity of the products were also investigated. This method avoided the probably generated Fe3+ at the precursors mixing process. The particle size was reduced to nanoscale without any additives. The as-prepared product showed excellent electrochemical properties especially rate capability. The reaction mechanism of this method was also studied.

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