Journal
JOURNAL OF NANOTECHNOLOGY
Volume 2019, Issue -, Pages -Publisher
HINDAWI LTD
DOI: 10.1155/2019/2501039
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Funding
- Kansai University Fund for the Promotion and Enhancement of Education and Research, 2017 Development of Environmental Friendly Functional Materials
- Kansai University Outlay Support for Establishing Research Centers (2016-2017)
- Private University Research Branding Project: from the Ministry of Education, Culture, Sports, Science and Technology (MEXT), Japan (2016-2020)
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A novel nanofibrous gel electrolyte was prepared via gelatin electrospinning for use as a nonaqueous electrolyte in electric double-layer capacitors (EDLCs). An electrospinning technique with a 25wt% gelatin solution was applied to produce gelatin electrospun (GES) nanofiber electrolytes. Structural analysis of the GES products showed a clearly nanofibrous structure with fiber diameters in the 306.2-428.4nm range and exhibiting high thermal stability, high tensile strength, and a stable form of nanofibrous structure after immersion in 1-ethyl-3-methylimidazolium tetrafluoroborate (EMImBF(4)). After testing over a range of spinning times, GES electrolytes that were produced at 25min (GES-25) had a suitable thickness for the assembly of EDLC with the optimized tensile properties and were used to fabricate EDLC test cells with EMImBF(4). These test cells were compared to those with pure EMImBF(4) and a separator as an electrolyte. The electrochemical properties of the test cells were characterized by charge-discharge testing, discharge capacitance, and alternative current (AC) impedance measurements. AC impedance measurements showed that the test cell with the GES-25/EMImBF(4) gel electrolyte showed slightly poorer contact with the electrode when compared to that with pure EMImBF(4), whereas exhibited comparable IR drop and discharge capacitance (calculated capacitance retention was 56.6%). The results demonstrated that this novel gel electrolyte can be used as a nonaqueous electrolyte in order to improve the safety in EDLCs.
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