An electrochemical ac impedance study of Li_xNi_0.75)Co_0.05O_2 intercalation electrode

摘要

An EIS study on Li_xNi_0.75Co_0.25O_2 intercalation cathode has been performed. The spectra have been interpreted on the basis of an equivalent circuit based on a combination of a Voigt-type analog (Li ion migration through surface film and charge transfer) in series with a Warburg type element, an element that takes into account the electronic resistance of the material and a capacitor (Li accumulation).