Time-difference impedance spectroscopy of growing films containing a single mobile charge carrier, with application to surface films on Li electrodes

Article Abstract:

A new approach to analyze the electrochemical impedance spectroscopy (EIS) data for electrodes covered by passivating surface films that grow in time is reported. The time-difference impedance spectra (DIS), which is the difference between two complex impedance curves, Z(omega, T1)-Z(omega, t2) measured after different period of storage, t1and t2 as a function of frequency provide an useful tool for characterizing the nature of the growing passivating films.

Usage, Spectrum analysis, Spectroscopy

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Impedance of single intercalation particle and of non-homogenous, multilayered porous composite electrodes for Li-ion batteries

Article Abstract:

The problem of the formation of low-frequency arcs and well-defined semicircles in the impedance spectra of a variety of porous, composite Li intercalated electrodes, presented in the form of Nyquist plots are discussed. The appearance of the low-frequency semicircle with a high capacitance value, can be achieved by adopting a nonhomogenous, layered distribution of the active electrode mass.

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Nanostructured Li ion insertion electrodes. 2. Tin dioxide nanocrystalline layers and discussion on "nanoscale effect"

Article Abstract:

The participation of a large amount of inserted charge in the Sb-doped sample can be possible due to the "nanoscale factor" which causes rapid charging of the faradaic capacitance- related process. The "nanoscale effect" provides the rapid ionic insertion into the nanostructured particles, while the Sb-doped atoms supply greater electronic conductivity.

Crystallization, Structure

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