Citation: DONG Jing, ZHONG Ben-He, ZHONG Yan-Jun, TANG Yan, LIU Heng, GUO Xiao-Dong. EDTA-Assisted Hydrothermal Synthesis for Rod-Like LiFePO4 with Enhanced Electrochemical Properties[J]. Chinese Journal of Inorganic Chemistry, ;2013, 29(10): 2257-2264. doi: 10.3969/j.issn.1001-4861.2013.00.333
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Rod-like LiFePO4 was synthesized by hydrothermal method using ethylene diamine tetraacetic acid (EDTA) as complexing agent to control the growth of the crystal. The materials were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscope (TEM), cyclic voltammetry (CV), electrochemical impedance spectroscopy (EIS) and galvanostatic charge-discharge test. The results show that EDTAhas great influence on the morphology and electrochemical performance. The crystal morphology develops from irregular particles to rod-like particles and the thickness of the particles decreases from 140~200 nm to 40~90 nm by adding EDTAand the obtained LiFePO4/Cwith EDTAexhibits a homogenous carbon coating layer with a thickness of ~3.5 nm. The discharge capacity is 167 mAh·g-1 (close to the theoretical capacity of 170 mAh·g-1) at 0.1C. The CVand EISresults indicate the samples prepared with EDTAhave a lower polarization and lower interfacial resistance.
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