【摘 要】
：
In this work we have studied the effect of 1,2-dimethoxyethane (1,2-DME) addition (from 0 to 90 vol％) on the electrochemical behaviour of 1-ethyl-3-methylimidazolium bis(trifluoromethylsulphonyl)imide (EMlmTFSI) as an electrolyte for supercapacitors,using
【机 构】
：
Institute of Chemistry, University of Tartu, 50411 Tartu, Estonia
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In this work we have studied the effect of 1,2-dimethoxyethane (1,2-DME) addition (from 0 to 90 vol％) on the electrochemical behaviour of 1-ethyl-3-methylimidazolium bis(trifluoromethylsulphonyl)imide (EMlmTFSI) as an electrolyte for supercapacitors,using cyclic voltammetry,electrochemical impedance spectroscopy and constant power methods.Also,the ionic conductivity and viscosity of EMImTFSI and 1,2-DME have been measured and discussed.The conductivity of the EMImTFSI could be increased from 5.67 mS/cm up to 24.21 mS/cm by mixing EMImTFSI with 1,2-DME.The stored power values for supercapacitors increased from 13 kW/kg to 20.5 kW/kg (correspond to 2 s application line),when the concentration of 1,2-DME increased up to 40 vol％.The supercapacitors based on the 40 vol％ of 1,2-DME deliver the higher power density at the constant energy density,showing an excellent characteristics applicable in high rate supercapacitor devices.Nearly ideal capacitive behaviour has been established at potential scan rates v ≤ 10 mV/s and cell potential △E ≤ 2.7 V.
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