Abstract
The stability of aluminium oxide has been investigated in mixtures of ionic liquid 1-butyl-3-methylimidazolium tetrafluoroborate (BMI.BF4) and γ-butyrolactone (GBL) for application as the impregnation electrolyte of aluminium electrolytic capacitors. Ionic conductivity measurements of BMI.BF4/GBL electrolytes at different temperatures were performed, as well as electrochemical impedance spectroscopy and cyclic voltammetry experiments. The results show that the highest ionic conductivity value of 40 mS cm−1 (70 °C) is achieved in electrolyte x BMI.BF4 = 0.2. The total capacitance values, associated with the dielectric oxides, vary between 1 and 8 μF cm−2 for all studied electrolytes after 30 days of immersion. The polarization resistance and total capacitance of the electrolyte/Al2O3/Al system decrease slightly with immersion time, showing the stability of Al2O3/Al in ionic liquid BMI.BF4/GBL electrolytes.
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The authors acknowledge the support of this work by TDK EPCOS.
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In memory of Roberto F. de Souza
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Borba, K.N., Trombetta, F., de Souza, R.F. et al. Stability of Al2O3/Al in ionic liquid BMI.BF4/γ-butyrolactone electrolytes for use in electrolytic capacitors. Ionics 23, 1165–1171 (2017). https://doi.org/10.1007/s11581-016-1912-x
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DOI: https://doi.org/10.1007/s11581-016-1912-x