Journal
ELECTROCHIMICA ACTA
Volume 319, Issue -, Pages 843-848Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.electacta.2019.07.015
Keywords
DMF-Based ionic liquid; High conductivity; Electrolyte; Supercapacitor; Capacitance
Categories
Funding
- Natural Science Foundation of China [21503050, 21464005, 21763006]
- Construction Project of Key Laboratories of Guizhou Provincial Education Department [QJHKY[2015]329]
- Natural Science Foundation of Guizhou Province [QKHJC[2016]1111, QKHJC[2017]1137]
- Natural Science Foundation of Shanxi [201701D121016]
- Guizhou Education University
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In this study, a new DMF-derived ionic liquid electrolyte [EDMF]BF4 was prepared, characterized and applied as a high-capacitance electrolyte for electric double-layer capacitors (EDLCs). [EDMF]BF4 was measured to have very high ionic conductivity and low viscosity (24.8 mS cm(-1) and 21.6 mPa s at 25 degrees C), as well as a comparable electrochemical window (4.4 V, on a GC electrode) with [EMIm]BF4, which is one of the most widely studied ionic liquid electrolytes with high performance. Therefore, [EDMF]BF4 was used as a non-volatile electrolyte for activated carbon-based EDLCs. The [EDMF]BF4-based EDLCs are capable to operate stably over a voltage of 2.7 V, and the specific capacitance of activated carbon was determined to be 165 F g(-1) (100th cycle at 1 mA cm(-2) and 30 degrees C), which is much larger than in the case of [EMIm]BF4 (126 F g(-1)). Besides, [EDMF]BF4 showed lower ohmic resistance and double layer resistance than [EMIm]BF4 in EDLCs. The high performance of [EDMF]BF4 electrolyte should be related to the quasi-linear [EDMF] cation of moderate size, which is presumably more suitable for enhanced ion mobility and compact electric double layer. (C) 2019 Elsevier Ltd. All rights reserved.
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