Design of a novel redox-active gel polymer electrolyte with a dual-role ionic liquid for flexible supercapacitors
| Autor: | Jihuai Wu, Yun Gu, Qiu-Mei Tu, Jianming Lin, Leqing Fan, Miaoliang Huang, Fei Pan, Yunfang Huang, Jian-Ling Huang |
|---|---|
| Rok vydání: | 2018 |
| Předmět: |
Supercapacitor
Vinyl alcohol Materials science General Chemical Engineering 02 engineering and technology Electrolyte 010402 general chemistry 021001 nanoscience & nanotechnology Electrochemistry 01 natural sciences Pseudocapacitance 0104 chemical sciences Dielectric spectroscopy chemistry.chemical_compound Chemical engineering chemistry Ionic liquid Cyclic voltammetry 0210 nano-technology |
| Zdroj: | Electrochimica Acta. 268:562-568 |
| ISSN: | 0013-4686 |
| Popis: | By choosing an ionic liquid 1-butyl-3-methylimidazolium iodide (BMIMI) as plasticizer and redox additive, along with a neutral Li2SO4 aqueous solution to achieve wide operating voltage, a redox-active poly(vinyl alcohol) (PVA)-Li 2 SO 4 -BMIMI gel polymer electrolyte (GPE) was prepared and used for the assemble of an activated carbon-based flexible supercapacitor. The electrochemical performances of the flexible supercapacitor with an optimized PVA-Li 2 SO 4 -BMIMI GPE were evaluated by cyclic voltammetry, galvanostatic charge-discharge and electrochemical impedance spectroscopy techniques. The mechanical performance of the flexible supercapacitor under different bending angles was also discussed. The obtained PVA-Li 2 SO 4 -BMIMI GPE exhibits the rarely found elongation at break of up to about 1200%. The flexible supercapacitor can reach a high energy density of 29.3 Wh kg−1, which is attributed to the wide voltage (1.5 V) resulted from the strong solvation of Li+ cations and SO42− anions, and the pseudocapacitance contributed by Faradaic reactions of the I-based ions in the GPE. Moreover, the flexible supercapacitor shows good cyclic durability and superior mechanical performance. For comparison, the PVA-Li 2 SO 4 - BMIMCl GPE was also synthesized and then its performance was studied. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|
Full Text from ScienceDirect