Abstract
Hydrated amorphous FePO 4 was synthesized by a sonochemical reaction method, in which a solution of (NH 4) 2HPO 4 and FeSO 4·7H 2O was irradiated by an ultrasonic wave. From this material, two kinds of cathode materials were easily prepared: (1) an amorphous sample prepared by heating at 350 °C and (2) a crystalline sample prepared by heating at 700 °C. Both samples consisted of homogeneous sub-micron particles. The amorphous sample of FePO 4 exhibited high discharge capacities with more than 100 mAh g −1 in the range of 3.9–2.0 V versus Li/Li + at a current rate of 0.2 C. The sonochemical synthesis proposed herein has the following advantages: no use of oxidation agents for production of trivalent iron ions, reduction in reaction time, control of particle size, and enlargement in surface area for the preparation of the cathode material.
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