Supercapacitive performance of porous graphene nanosheets in bis(trifluoromethylsulfony)imide and bis(fluorosulfonyl)imide ionic liquid electrolytes

Bo Rui Pan, Sheng Wei Lee, Chung Jen Tseng, Chien Liang Chang, Wu Ching Hung, Jeng-Kuei Chang*

*此作品的通信作者

研究成果: Article同行評審

3 引文 斯高帕斯(Scopus)

摘要

A method of high-heating-rate thermal reduction is used to produce porous graphene nanosheets (PGNSs). This material is characterized by a unique holey structure, which is suitable for ionic liquid (IL) electrolyte. To study the effects of electrolyte anion, 1-ethyl-3-methylimidazolium bis(trifluoromethylsulfony)imide (EMI-TFSI) and 1-ethyl-3-methylimidazolium bis(fluorosulfonyl)imide (EMI-FSI) ILs are used. Due to the smaller size of FSI, EMI-FSI shows a higher conductivity and lower viscosity than those of EMI-TFSI. The specific capacitances of PGNS electrodes are 90 and 260 F g−1, respectively, measured in EMI-TFSI and EMI-FSI ILs at a potential scan rate of 50 mV s−1. The PGNS symmetric cell with EMI-FSI electrolyte is able to deliver a maximum energy and power densities of 110 Wh kg−1 and 101 kW kg−1, respectively, with a cell voltage of 3.5 V. In addition, 85% of the initial capacity can be retained after 2000 charge–discharge cycles.

原文English
頁(從 - 到)2197-2203
頁數7
期刊Journal of Solid State Electrochemistry
22
發行號7
DOIs
出版狀態Published - 1 7月 2018

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