Hydrothermal synthesis of lithium iron phosphate using pyrrole as an efficient reducing agent

作者：Liang, Yi-Ping; Li, Chia-Chen; Chen, Wen-Jing; Lee, Jyh-Tsung^*

来源：Electrochimica Acta, 2013, 87: 763-769.

DOI：10.1016/j.electacta.2012.09.088

• Lithium iron phosphate
• Hydrothermal
• Lithium-ion batteries
• Pyrrole
• Polypyrrole

Lithium iron phosphate (LiFePO4) is synthesized by a hydrothermal process using pyrrole as an efficient reducing agent and a subsequent calcination. Observations through a scanning electron microscope and a transmission electron microscope (TEM) show that LiFePO4 has a diameter and length of 500 nm and 3 mu m, respectively. The results of TEM and X-ray diffraction confirm that the structure of LiFePO4 is orthorhombic olivine. Raman and X-ray photoelectron spectroscopy results indicate that Fe3+ oxidized from reactant Fe2+ by air reacts with pyrrole, generating polypyrrole (PPy), and reduces to Fe2+. PPy that is generated can also serve as a carbon source in the subsequent calcination. In addition, the electrochemical measurement results show that the energy capacity of calcined LiFePO4/PPy is 153 mAh g(-1) at 0.2 C. Calcined LiFePO4/PPy offers promising cycle-life performance in lithium-ion batteries.

• 出版日期2013-1-1
• 单位中山大学