Synthesis of FePO4 from Fe2O3 and Its Application in Synthesizing Cathode Material LiFePO4

doi:10.3724/SP.J.1077.2013.12178

Abstract

Abstract:

FePO₄ was synthesized by rheological phase method using Fe₂O₃, NH₄H₂PO₄ and H₂NCONH₂ as row materials. The influence of temperature on the synthesis process was investigated. Taking prepared FePO₄ as iron source, LiFePO₄was also synthesized by rheological phase method. The structure and morphology of as prepared FePO₄and LiFePO₄ were characterized by XRD and SEM, respectively. XRD results indicate that FePO₄ is belong to the triclinic system, with α-quartz structure and LiFePO₄ is belong to the orthorhombic system, with olivine structure. SEM results showed that the FePO₄ particles were layered distribution, while the LiFePO₄ particles seemed like spherical. Both of the particles were well dispersed, and the average particle sizes were about 2 μm. Electrochemical properties of the obtained LiFePO₄ cathode material were investigated by galvanostatic charge-discharge test, cyclic voltammetry(CV) and alternating current(AC) impedance methodes, the initial discharge capacity could reach 163.4 mAh/g, indicating excellent electrochemical performance. All the above results indicated that the prepared iron phosphate is an ideal iron source for the synthesis of lithium-ion battery cathode material LiFePO₄.

Key words: lithium-ion batteries, cathode material, FePO₄, LiFePO₄, rheological phase method

CLC Number:

TM912

WANG Tao, YIN Ye, LIU Hao-Wen. Synthesis of FePO₄ from Fe₂O₃ and Its Application in Synthesizing Cathode Material LiFePO₄[J]. Journal of Inorganic Materials, 2013, 28(2): 207-211.

Figures/Tables 11

Fig. 1 XRD patterns of FePO4 particles synthezised at different temperatures (700℃, 800℃, 900℃)

Fig. 2 SEM images of FePO4 particles calcined at 900℃

Fig. 3 XRD pattern of LiFePO4 sample and standand LiFePO4 (PDF 40-1499)

Fig. 4 TG/DSC curves of LiFePO4 particles

Fig. 5 SEM images of LiFePO4 sample

Fig. 6 Initial charge-discharge curve of LiFePO4 at 2.0-3.8 V, 0.1C

Fig. 7 Cyclic voltammograms for LiFePO4 at 2.0-4.8 V, scaning rate of 0.1 and 0.01 V/s

Fig. 8 EIS analysis of LiFePO4 sample

References 18

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Synthesis of FePO₄ from Fe₂O₃ and Its Application in Synthesizing Cathode Material LiFePO₄

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