Abstract
LiFePO4 batteries play a crucial role in energy storage and electric vehicles, with their precursor, FePO4, directly determining the electrochemical performance of LiFePO4. The key to preparing high-quality FePO4 is the precise regulation of crystal morphology. This study investigates the inter-ionic interaction of Fe3+ in a complex phosphate system to form monoclinic FePO4 with high crystallinity by precisely controlling process parameters such as pH and reaction temperature. The optimized process parameters are as follows: during the leaching stage, a P/Fe feeding ratio of 3:1 and a reaction temperature of 90 °C; during the oxidation stage, a 140 % excess of H2O2 and a reaction temperature of 50 °C; and during the crystallization stage, a pH of 1.5 and a reaction temperature of 90 °C, with an aging time of 1 h. The resulting FePO4 has a round cake morphology with a diameter of approximately 1.5 μm and a thickness of about 0.5 μm. The particle size distribution is narrow, with a D50 of 2.64 μm. The products exhibit consistent crystalline morphology, high crystallinity, an Fe content of 36.595 %, a P content of 20.676 %, and an Fe/P ratio of 0.981. The synthesized LiFePO4/C derived from this FePO4 shows a discharge capacity of 154 mAh/g at 0.2C. The proposed preparation mechanism has significant theoretical implications for the efficient and environmentally friendly production of FePO4 in the industry.
Published Version
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