Deep eutectic solvent-based supramolecular gel polymer electrolytes for high-performance electrochemical double layer capacitors |
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Authors: | Guoqiang Li He Yang Danying Zuo Jing Xu Hongwei Zhang |
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Affiliation: | College of Materials Science and Engineering, Wuhan Textile University, WuHan, 430073, PR China |
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Abstract: | Gel polymer electrolytes (GPEs) can avoid the electrolyte leakage risk of electrochemical double layer capacitors (EDLCs). But aqueous GPEs often suffer from narrow electrochemical windows. Herein, a series of deep eutectic solvent (DES)-based supramolecular GPEs are firstly developed for carbon-based EDLCs with wide voltage windows. The as-fabricated DES-based GPE shows an ionic conductivity of ~58 mS cm?1, which makes the stable voltage window of a carbon-based EDLC reach 2.4 V. The carbon-based EDLC exhibits a specific capacitance of 32.1 F g?1, an energy density of 24.6 Wh kg?1 and a capacitance retention of ~90% after 15,000 charge-discharge cycles. Moreover, when quinhydrone is added into the DES-based GPE, the specific capacitance and energy density of the corresponding EDLC can be further expanded to 60 F g?1 and 43.6 Wh kg?1, respectively. Therefore, our work may present a universal strategy to prepare novel supramolecular GPEs for high-performance EDLCs with wide voltage windows. |
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Keywords: | Deep eutectic solvent Supramolecular gel polymer electrolyte Ionic conductivity EDLC Energy density |
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