Effect of electrode shape on lithium metal fog in LiCl-KCl

摘要

The so-called metal fog sometimes formed during the molten salt electrolysis. In this paper, the effect of the surface shape of electrode on the metal fog formation was investigated in LiCl-KCl. Cyclic voltammetry and potentiostatic electrolysis were carried out at Mo wire electrode with/without screw cutting. The dark blue metal fog was formed at both types of electrodes, while the gray metal fog was generated only at the screw-cut electrode. The gray fog formation also depended on the diameter of the electrode; the formation was intenser at a small electrode than at a large electrode. It is concluded that the shape of electrode strongly affects the gray metal fog formation, and it is suggested that the current concentration at the edge causes the formation.