A Study of Current Collectors for Magnesium Batteries in Mg(AlCl2EtBu)2/THF Electrolyte Using the Scanning Vibrating Electrode Technique
The instability of a range of current collectors, when exposed to Grignard reagents, with the exception of Nickel, has been highlighted previously3. In the current study the scanning vibrating electrode technique (SVET) is used to map the current density over the surface of a selection of metals when polarised to an applied potential. The technique can then be used to spatially resolve anodic and cathodic activity. SVET has been used extensively in corrosion research where a wealth of literature is available. Figure 1 shows a typical SVET-derived current density surface map, obtained by scanning a metallic surface when fully immersed in electrolyte; the red peaks denote the anodic regions. The aim of the current study is to further understand the instability of certain metals, that are often considered as suitable current-collectors in Mg-based battery systems, when exposed to (Mg(AlCl2EtBu)2/THF). Copper, nickel, stainless steel and silver will be studied.
Figure 1 A typical SVET-derived current density surface map obtained by scanning a metallic surface when fully immersed in electrolyte.
1 P. Saha, M. K. Datta, O. I. Velikokhatnyi, A. Manivannan, D. Alman, and P. N. Kumta, Prog. Mater. Sci., 2014, 66, 1–86.
2 D. Aurbach, Z. Lu, A. Schechter, Y. Gofer, H. Gizbar, R. Turgeman, Y. Cohen, M. Moshkovich, and E. Levi, Nature, 2000, 407, 724–7.