Stability of Al2O3/Al in ionic liquid BMI.BF4/γ-butyrolactone electrolytes for use in electrolytic capacitors
| Autor: | Roberto F. de Souza, Emilse M.A. Martini, Katiúscia M.N. Borba, Fernanda Trombetta |
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| Rok vydání: | 2016 |
| Předmět: |
Electrolytic capacitor
General Chemical Engineering Inorganic chemistry General Engineering Analytical chemistry General Physics and Astronomy 02 engineering and technology Electrolyte Conductivity 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences 0104 chemical sciences Dielectric spectroscopy chemistry.chemical_compound chemistry Ionic strength Ionic liquid Aluminium oxide Ionic conductivity General Materials Science 0210 nano-technology |
| Zdroj: | Ionics. 23:1165-1171 |
| ISSN: | 1862-0760 0947-7047 |
| DOI: | 10.1007/s11581-016-1912-x |
| Popis: | 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. |
| Databáze: | OpenAIRE |
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