Synthesis of LiFePO4 Using FePO4 Produced by Electrolyzing Fe1.5P Waste Slag

doi:10.3724/SP.J.1077.2012.00475

Abstract

Abstract:

Fe_1.5P waste slag was galvanostatically electrolyzed without separator in a H₃PO₄ aqueous solution using graphite as the cathode, and the electrolyte color turned from achromatism to yellow after electrolysis. Light yellow powder was finally obtained by adjusting the value of pH using ammonia water, filtering, washing and drying in sequence. The results of XRD and TG-DTA showed that the as-electrolyzed product was FePO₄·2H₂O. The as-obtained FePO₄·2H₂O was mixed well with LiOH·H₂O and glucose to form a rheological phase precursor by using ethanol as a dispersing agent. LiFePO₄/C composite was synthesized successfully by calcining the above precursor at 700℃ in an Ar atmosphere. The electrolysis process was investigated via a potentiodynamic polarization method. The structure, morphology and electrochemical performance of the as-synthesized LiFePO₄/C composite were characterized by XRD, SEM and cyclic voltammetry, respectively. There was no impurity indexed peaks from Fe_1.5P raw material, and the oxidization potential and the reduction potential were at 3.54 V and 3.33 V, respectively. The good experimental results indicated that electrolysis of Fe_1.5P waste slag using an anode bag can eliminate the effect of impurities from raw material and the polarization between lithium ion intercalation and de-intercalation was low.

Key words: lithium-ion battery, LiFePO₄, Fe_1.5P, electrolysis, cyclic voltammetry

CLC Number:

TM911

LIU Yan, WANG Gui-Xin, YAN Kang-Ping, LI Cheng-Jia. Synthesis of LiFePO₄ Using FePO₄ Produced by Electrolyzing Fe_1.5P Waste Slag[J]. Journal of Inorganic Materials, 2012, 27(5): 475-479.

Figures/Tables 7

Fig. 1 XRD pattern of the Fe-P raw material

Fig. 2 Potentiodynamic polarization curves of the Fe1.5P in H3PO4 aqueous solution

Fig. 3 ? XRD patterns of the electrolytic products (a) uncalcined and (b) calcined at 600℃ in air for 3 h

Fig. 4 TG-DTA curves of the electrolytic product

Fig. 5 XRD pattern of the as-synthesized LiFePO4/C from the electrolytic product

Fig. 6 SEM image of the as-synthesized LiFePO4/C

Fig. 7 ββCyclic voltammogram of the as-synthesized LiFePO4/C

References 16

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Synthesis of LiFePO₄ Using FePO₄ Produced by Electrolyzing Fe_1.5P Waste Slag

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