Abstract
Oxygen selective membranes (OSMs) are considered to be an optimal solution for problems of lithium-air batteries (LABs) operating in an open environment. In this study, we use an electrostatic spinning method to fabricate a porous polytetrafluoroethylene hexafluoropropylene (PVDF-HFP) based oxygen selective membrane that was further impregnated with perfluoropolyether (PFPE) to achieve the goal of preventing permeation of moisture. The lithium-air battery under the protection of PFPE@PVDF-HFP can cycle stably for 620 h in an ambient air with relative humidity (RH) of 50%, which is 8 times better than the battery without the protection of OSM. In addition, through in situ electrochemical impedance spectroscopy (EIS) measurements, we illustrate the characterization of OSM more accurately. This electrochemical method provides a novel idea for the characterization of the performance of OSMs. The introduction of ruthenium oxide (RuO2) nanoparticles to the cathode can further improve the cycling performance from 620 to 1200 h by promoting the decomposition of by-products.
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