Electrolytes highly enriched with oxygen for lithium-oxygen (Li-O<inf>2</inf>) batteries were prepared by combining perfluorohexyl bromide as an oxygen-uptake perfluorochemical (PFC) medium with lithium perfluorooctane sulfonate (LiPFOS) as a perfluoro-surfactant and a supporting electrolyte, which allowed an exceptionally high miscibility of PFCs with tetraethylene glycol dimethyl ether (TEGDME). The electrochemical reduction current of oxygen was enhanced three times in the LiPFOS-TEGDME electrolyte with ca. 60 wt% PFC content in comparison with that of a conventional Li-O<inf>2</inf> battery electrolyte, which was ascribed to the high oxygen solubility of the electrolyte. A Li-O<inf>2</inf> cell fabricated with the PFC-based electrolyte exhibited an excellent discharging capacity of 6500 mA h g<sup>-1</sup> which was approximately 1.5 times higher than that obtained with the conventional electrolyte.
ASJC Scopus subject areas
- Renewable Energy, Sustainability and the Environment
- Materials Science(all)