Effect of solvents on electrochemical performance of polypyrrole coated LiFePO4/C cathode materials for Li-ion battery
作者： Rajeev Sehrawat , Anjan Sil
DOI: 10.1007/S10854-015-3048-6
关键词: Dielectric spectroscopy 、 Materials science 、 Acetonitrile 、 Scanning electron microscope 、 Coating 、 Solvent 、 In situ chemical oxidation 、 Chemical engineering 、 Analytical chemistry 、 Polypyrrole 、 Electrochemistry
摘要: The effect of the nature solvent on polypyrrole (PPy) synthesis by in situ coating prior synthesized carbon coated LiFePO4 for electrochemical properties composite materials designated as LiFePO4/C-PPy has been investigated. An chemical oxidation method is used polymerization pyrrole using three different solvents e.g. water, ethanol and acetonitrile (ACN). structure morphology PPy grown characterized Raman spectroscopy scanning electron microscopy respectively. X-ray diffraction patterns composites confirm presence Li0.05FePO4 compound a minor phase along with major phase. ACN assisted shows best performance cathode material among selected synthesis. Electrochemical impedance indicates lowest electrode highest Li-ion diffusion compared to water derived samples. higher rate capability (82 mAh g−1) LiFePO4/C (42 g−1), attributed polymer coating.
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