Hydrothermal synthesis of lithium iron phosphate using pyrrole as an efficient reducing agent
| Autor: | Yi-Ping Liang, Wen-Jing Chen, Jyh-Tsung Lee, Chia-Chen Li |
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| Rok vydání: | 2013 |
| Předmět: |
Materials science
Reducing agent Scanning electron microscope General Chemical Engineering Lithium iron phosphate Inorganic chemistry chemistry.chemical_element Polypyrrole Electron spectroscopy law.invention chemistry.chemical_compound chemistry Chemical engineering law Electrochemistry Hydrothermal synthesis Calcination Lithium |
| Zdroj: | Electrochimica Acta. 87:763-769 |
| ISSN: | 0013-4686 |
| DOI: | 10.1016/j.electacta.2012.09.088 |
| Popis: | Lithium iron phosphate (LiFePO 4 ) 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 LiFePO 4 has a diameter and length of 500 nm and 3 μm, respectively. The results of TEM and X-ray diffraction confirm that the structure of LiFePO 4 is orthorhombic olivine. Raman and X-ray photoelectron spectroscopy results indicate that Fe 3+ oxidized from reactant Fe 2+ by air reacts with pyrrole, generating polypyrrole (PPy), and reduces to Fe 2+ . 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 LiFePO 4 /PPy is 153 mAh g −1 at 0.2 C. Calcined LiFePO 4 /PPy offers promising cycle-life performance in lithium-ion batteries. |
| Databáze: | OpenAIRE |
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