Abstract
The raw carbon nanotubes were synthesized by electric arc method and doped with lithium. Electrochemical impedance spectroscopy was applied for the raw carbon nanotubes pre-doped with lithium during Li-ion insertion in the electrolyte of 1 M LiClO 4/EC+DMC. After treated with lithium compounds the reversible capacity was increased than that of raw carbon nanotubes. The impedance spectra measured consist of a depressed semicircle in the high frequency range and a straight line at low frequency. Obtained spectroscopies were analyzed with an equivalent circuit model. Kinetic parameters such as the charge transfer resistance and the chemical diffusion coefficient of Li-ion in the carbon nanotubes were evaluated. It showed that the D Li increased as the Li concentration increased. The possible reasons that can explain the variations in the diffusion coefficient with the open circuit voltage are controlled by the effective cross-section of the diffusion.
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