Journal
JOURNAL OF ENERGY STORAGE
Volume 32, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.est.2020.101904
Keywords
Ternary deep eutectic solvent; Wide temperature region; Supercapacitor; Superior performance; Density functional theory
Categories
Funding
- National Natural Science Foundation of China [51602003]
- Startup Foundation for Doctors of Anhui University [J01003211]
- Key Laboratory of Photovoltaic and Energy Conservation Materials, CAS [PECL2019KF001]
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In present work, we successfully synthesize a novel ternary deep eutectic solvent electrolyte for wide-temperature region supercapacitor (-40-115 degrees C) through adjusting the molar ratio between choline chloride, ethylene glycol and urea. Notably, when the molar ratio is 1: 2: 1 (choline chloride:ethylene glycol:urea), the electrolyte under 115 degrees C not only exhibits prominent transport properties (viscosity: 3.39 cP; conductivity: 13.41 mS cm(-1)), but also delivers the excellent electrochemical performances with specific capacitance up to 317 F g(-1) (specific energy: 74.37 Wh kg(-1)), and the stability after 10,000 cycles close to 100%. Besides, the theoretical calculation by density functional theory reveals that the total energy of electrolyte with a molar ratio of 1: 2: 1 is the largest (24.66 eV), confirming its outstanding performances. More importantly, hydrogen bonding indeed occurs in such electrolytes which helps the electrolyte to achieve normal operation over a wide-temperature range. This electrolyte possesses the capacity for lighting bulb and maintaining brightness for 50 s. The present ternary deep eutectic solvent offers a bran-new research idea for wide-temperature region electrolyte employed to supercapacitors.
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