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The micro-nano-structured FePO 4 ·2H 2 O was prepared from mixed solution of FeSO 4 oxidized in diluted H 3 PO 4 with H 2 O 2 and NaOH solution in the turbulent flow cycle state at 90 °C. The resulting products were characterized by thermogravimetric analysis (TGA), scanning electron microscopy (SEM), and transmission electron microscopy (TEM). Constant current charge/discharge tests were adopted to investigate the electrochemical performance and the rate capability (from 0.1C to 5C) of the carbon-coated LiFePO 4 composite materials prepared from the micro-nano-structured FePO 4 . The carbon-coated LiFePO 4 composite materials deliver a high specific discharge capacity of 153.7 mAh·g -1 , exhibit excellent cycle performance with 98.6% of the capacity retained after 30 cycles. This study demonstrates that the turbulent flow cycle method may be an economical and effective method for industrial production of fine and uniform micro-nano-structured FePO 4 ·2H 2 O particles for LiFePO 4 cathode materials for Li-ion batteries.

Preparation of Micro–Nano-Structured FePO4·2H2O for LiFePO4 Cathode Materials by the Turbulent Flow Cycle Method

Preparation of Micro–Nano-Structured FePO₄·2H₂O for LiFePO₄ Cathode Materials by the Turbulent Flow Cycle Method