Effect of Surface Oxide Films of Aluminum on Anodic Oxidation Process in Organic Electrolytes

Abstract

The influence of surface oxide films on anodic oxidation process in an organic electrolyte was investigated from the perspective of the breakdown voltage (E_bd). Composites of anodic oxide films were analyzed using X-ray photoelectron spectroscopy (XPS). Pre-oxidized anodic oxide film at 15 V drastically increased E_bd from 26 V to 63 V in organic electrolyte (1M LiBF₄/ethylene carbonate : diethyl carbonate (1 : 1 v/v%)). Furthermore, XPS analysis of the anodic oxide film structure revealed AlF₃/AlO_x/2F_3−x/Al. The rise in E_bd would be explained by the change in the unevenness of anodic oxide film.