关键词: 磷酸铁, 磷酸铁锂, 锂离子电池, 正极材料

Abstract: The precursor，FePO₄·2H₂O with different particle sizes and morphologies was syhthesized by co-precipitation method with FeSO₄·7H₂O by-produced from the production of titanium dioxide as the iron source，industrial NH₄H₂PO₄ as the phosphorus source，and with H₂O₂ as the oxidant.LiFePO₄/C cathode material was prepared through carbon thermal reduction technology with as-prepared FePO₄·2H₂O as iron source.The structure，morphology，and electrochemical properties of FePO₄·2H₂O and LiFePO₄/C samples were characterized by XRD，SEM，and galvanostatic charge-discharge tests.Results showed that LiFePO₄/C had much smaller particle size and superior electrochemical performance when the FePO₄·2H₂O with smaller particle size was used as iron source.The initial discharge capacity of the sample was 154，148，144，140，130，120 mA·h/g at 0.1，0.5，1，2，5，10 C rates，respectively.

Key words: hydrated iron（Ⅲ） phosphate, lithium iron phosphate, lithium-ion battery, cathode material