Noise characterization of surface processes of the Li/organic electrolyte interface

Abstract

The processes occurring in aprotic electrolyte on a lithium electrode in the steady state conditions and under polarization are studied using the method of electrochemical noise characterization. The evidence of the electrochemical noise measurements on polarized lithium electrodes indicates that the discharge of lithium ions under cathodic polarization, as well as lithium anodic dissolution, is localized under the passive film rather than on its surface. An increase in the polarizing current results in local breakdown of the film; in this case, the electrochemical process emerges on the electrode surface affecting the character of potential fluctuations. The intensity of electrochemical noise significantly increases in the course of cathodic polarization with high currents. The reason is that lithium metal crystals, which are formed under the passive film, perforate the film, and dendrites grow on its surface. The method shows the dependence of electrochemical noise intensity on the nature of the electrolyte and establishes the correlation between the stability of the lithium electrode in the course of cycling and the intensity of fluctuations. This offers an opportunity of using the method of electrochemical noise for screening organic electrolytes for lithium batteries.

Electrochemical Noise as a Diagnostic Tool for PEMFC

“…Electrical fluctuations are inherent properties of any electrochemical system and could be used to direct characterization of its state. Diagnostic methods based on electrochemical noises are widely used for studying metal films and corrosion of electrodes , quality of passivation coatings , , estimation of state‐of‐charge and detection of overcharge for electrochemical batteries , , etc. An essential advantage of noise (fluctuation) method is absence of any perturbation of the electrochemical system by external probing signals.…”

New methodology of electrochemical noise analysis and applications for commercial Li-ion batteries

“…Noise measurements have been widely used not only in the 1960s in relation to communication systems [7] and semiconductors [8] but also from time to time in electrochemical studies [9][10][11][12]. Electrochemical noise can be caused by different phenomena such as turbulent mass transfer [13][14][15][16][17], gas evolution [18][19][20], electrode corrosion [21][22][23][24] and passivation [25], or water transfer in fuel cells [26].…”

The Model of Electrochemical Noise of a Hydrogen-Air Fuel Cell

“…There are a number of studies where authors attempted to measure and analyze electrochemical noise of different types of CPS of a practical interest, such as lithium systems, [16][17][18][19] as well as fuel cells. [20][21][22][23][24][25][26][27] We also made an attempt to study the change in the characteristics of ECN during the aging of the hydrogen-air fuel cell (FC).…”