Noise characterization of surface processes of the Li/organic electrolyte interface |
| |
Authors: | BM Grafov LS Kanevskii MG Astafiev |
| |
Affiliation: | (1) A.N. Frumkin Institute of Electrochemistry of Russian Academy of Sciences, Leninskii prosp., 31, Moscow, 119071, Russia |
| |
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 electro-chemical 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. |
| |
Keywords: | aprotic organic electrolytes electrochemical noise formation of dendrites lithium battery lithium electrode |
本文献已被 SpringerLink 等数据库收录! |
|