標題: Supercapacitive Properties of Micropore- and Mesopore-Rich Activated Carbon in Ionic-Liquid Electrolytes with Various Constituent Ions
作者: Quoc Dat Nguyen
Patra, Jagabandhu
Hsieh, Chien-Te
Li, Jianlin
Dong, Quan-Feng
Chang, Jeng-Kuei
材料科學與工程學系
Department of Materials Science and Engineering
關鍵字: carbon;electric double-layer;ionic liquids;pore size;supercapacitors
公開日期: 24-一月-2019
摘要: Ionic-liquid (IL) electrolytes, characterized by large potential windows, intrinsic ionic conductivity, low environmental hazard, and high safety, are used for micropore- and mesopore-rich activated-carbon (AC(micro) and AC(meso)) supercapacitors. IL electrolytes consisting of various cations [1-ethyl-3-methylimidazolium (EMI+), N-propyl-N-methylpyrrolidinium (PMP+), and N-butyl-N-methylpyrrolidinium (BMP+)] and various anions [bis(trifluoromethylsulfonyl)imide (TFSI-), BF4-, and bis(fluorosulfonyl)imide (FSI-)] are investigated. The electrolyte conductivity, viscosity, and ion transport properties at the AC(micro) and AC(meso) electrodes are studied. In addition, the capacitance, rate capability, and cycling stability of the two types of AC electrodes are systematically examined and post-mortem material analyses are conducted. The effects of IL composition on the charge-discharge capacitances of the AC(micro) electrodes are more pronounced than those for the AC(meso) electrodes. The FSI-based IL electrolytes, for which electrochemical properties are cation dependent, are found to be promising. Incorporating EMI+ with FSI- results in a low electrolyte viscosity and a fast ion transport, giving rise to optimized electrode capacitance and rate capability. Replacing EMI+ with PMP+ increases the cell voltage (to 3.5 V) and maximum energy density (to 42 Wh kg(-1)) of the AC(micro) cell at the cost of cycling stability.
URI: http://dx.doi.org/10.1002/cssc.201802489
http://hdl.handle.net/11536/148931
ISSN: 1864-5631
DOI: 10.1002/cssc.201802489
期刊: CHEMSUSCHEM
Volume: 12
起始頁: 449
結束頁: 456
顯示於類別:期刊論文