Citation: CAO Yan-Bing, DUAN Jian-Guo, JIANG Feng, HU Guo-Rong, PENG Zhong-Dong, DU Ke. Synthesis of LiFePO₄ Cathode Materials by Mechanical-Activation-Assisted Polyol Processing[J]. Acta Physico-Chimica Sinica, ;2012, 28(05): 1183-1188. doi: 10.3866/PKU.WHXB201202221 shu

Synthesis of LiFePO₄ Cathode Materials by Mechanical-Activation-Assisted Polyol Processing

1.
1. School of Metallurgical Science and Engineering, Central South University, Changsha 410083, P. R. China;
2. School of Materials Science and Engineering, Central South University, Changsha 410083, P. R. China

Received Date: 2 November 2011
Available Online: 22 February 2012
Fund Project: 国家科技支撑计划项目(2007BAE12B01) (2007BAE12B01)湖南省科技计划项目(2009GK3150)资助 (2009GK3150)

A low-temperature approach for efficient preparation of LiFePO₄ was developed. The rod-shaped [Fe₃(PO₄)₂·8H₂O + Li₃PO₄] precursor was prepared, using a mechanochemical liquid-phase activation technique, from LiH₂PO₄ and reduction iron powder. Pure LiFePO₄ was then synthesized in boiling tetra(ethylene glycol) (TEG) by polyol processing with the as-prepared precursor. In order to improve the electrical conductivity, carbon coating of the pure LiFePO₄ was carried out, using poly(vinyl alcohol) (PVA) as the carbon source. The products were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), galvanostatic charge-discharge test and electrochemical impedance spectroscopy (EIS). The results show that well-crystallized LiFePO₄ was successfully synthesized by polyol processing at low temperature. Carbon coating significantly improves the conductive properties of LiFePO₄ and reduces charge-transfer impedance. The obtained LiFePO₄/C composite delivers specific discharge capacities of 139.8 and 129.5 mAh·g^-1 at 1C and 2C rates, respectively, displaying od cycling performance and rate capability.
- Cathode Material, LiFePO₄,
- Mechanical activation,
- Polyol processing,
- Carbon coating
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Synthesis of LiFePO₄ Cathode Materials by Mechanical-Activation-Assisted Polyol Processing