Abstract
Influence of temperature and the separator material characteristics (composition, porosity, structure) on the performance of supercapacitors (SCs), based on microporous titanium carbide−derived carbon electrodes in 1 M triethylmethylammonium tetrafluoroborate solution in dimethyl carbonate, ethylene carbonate and propylene carbonate mixture with 1:1:1 volume ratio, has been tested by cyclic voltammetry, constant power and electrochemical impedance spectroscopy methods at temperatures from +24 to −30°C. Self−made separator materials have been prepared from poly(vinylidene fluoride) solutions in N,N−dimethylacetamide or N,N−dimethylformamide and acetone mixture (8:2 mass ratio) by using the electrospinning method. Noticeable influence of temperature, porosity and chemical composition of separator on the shape of cyclic voltammetry curves and Nyquist plots, low−frequency limiting series capacitance and resistance, parallel capacitance and resistance, time constant, complex power components, and specific energy and power of the SCs has been established and discussed.
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