Preparation of Micro–Nano-Structured FePO(4)·2H(2)O for LiFePO(4) Cathode Materials by the Turbulent Flow Cycle Method

[Image: see text] 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.