Abstract
As the byproduct of TiO2 industrial production, impure FeSO4·7H2O was used for the synthesis of LiFePO4. With the purified solution of FeSO4·7H2O, FePO4·xH2O was prepared by a normal titration method and a controlled crystallization method, respectively. Then LiFePO4 materials were synthesized by calcining the mixture of FePO4·xH2O, Li2CO3, and glucose at 700°C for 10 h in flowing Ar. The results indicate that the elimination of FeSO4·7H2O impurities reached over 95%, and using FePO4·xH2O prepared by the controlled crystallization method, the obtained LiFePO4 material has fine and sphere-like particles. The material delivers a higher initial discharge specific capacity of 149 mAh·g−1 at a current density of 0.1C rate (1C = 170 mA·g−1); the discharge specific capacity also maintains above 120 mAh·g−1 after 100 cycles even at 2C rate. Thus, the employed processing is promising for easy control, low cost of raw material, and high electrochemical performance of the prepared material.
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Peng, Z., Cao, Y., Zhou, Y. et al. Synthesis of LiFePO4 using FeSO4·7H2O byproduct from TiO2 production as raw material. Rare Metals 28, 612–617 (2009). https://doi.org/10.1007/s12598-009-0117-0
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DOI: https://doi.org/10.1007/s12598-009-0117-0