Abstract
Ionic liquids (ILs) based on sulfonylamide-type anions have gained widespread utility as electrolytes for secondary batteries. Although sulfonylamide-based IL electrolytes are known to form a stable passivation layer that prevents Al corrosion, the Al electrode in the Na[FSA]-[C2C1im][FSA] ([FSA] = bis(fluorosulfonyl)amide and [C2C1im] = 1-ethyl-3-methylimidazolium) IL, is found to be afflicted by pitting corrosion at potentials above 4 V vs Na+/Na during electrochemical measurement at 90 °C. Therefore, this study investigates the suppressive effect of [FAP]− (FAP = tris(pentafluoroethyl)trifluorophosphate) on the Al corrosion behavior of the IL electrolyte. Here, the inhibited corrosion of the Al electrode is confirmed through a series of cyclic voltammetry measurements, scanning electron microscopy, and energy-dispersive X-ray spectroscopy. Charge-discharge tests performed using a Na3V2(PO4)2F3 positive electrode demonstrates that the addition of [FAP]– into the IL enhances cycling performance at the intermediate temperature of 90 °C.
Funder
Japan Society for the Promotion of Science
Publisher
The Electrochemical Society
Subject
Materials Chemistry,Electrochemistry,Surfaces, Coatings and Films,Condensed Matter Physics,Renewable Energy, Sustainability and the Environment,Electronic, Optical and Magnetic Materials
Cited by
9 articles.
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