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Fluoroethylene Carbonate and Propylene Carbonate Mixtures Based Electrolytes for Supercapacitors

机译:超级电容器用碳酸氟乙烯酯和碳酸丙烯酯混合物的电解质

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The electrochemical characteristics of the electrical double layer capacitors consisting of the microporous titanium carbide derived carbon (TiC-CDC) electrode in 1M (C_2H_5)_3CH_3NBF_4 solutions in 4-methyl-1,3-dioxolan-2-one, (so-called propylene carbonate (PC)), 4-fluoro-1,3-dioxalan-2-one, (so-called fluoroethylene carbonate (FEC)), and in various mixtures of named solvents like FEC:PC (1:1 volume ratio), FECPC (1:9) and FECPC (1:19) have been studied using cyclic voltammetry and electrochemical impedance spectroscopy methods. The specific capacitance, phase angle and series resistance values dependent on the solvent system used and temperature applied (from -45 ℃ to 90 ℃) have been established. The region of ideal polarizability △E ≥ 3.0V has been demonstrated for TiC-CDC electrodes in all electrolytes and at temperatures investigated, except at T ≥ 90 ℃. Specific conductivity and viscosity values have been obtained and correlated with electrochemistry data. The limiting capacitance, the characteristic time constant and complex power values depend noticeably on the solvent used for preparation of electrolyte, i.e. on the viscosity and specific conductivity of electrolyte solution used.
机译:由微孔碳化钛衍生碳(TiC-CDC)电极在1M(C_2H_5)_3CH_3NBF_4溶液在4-甲基-1,3-二氧戊环-2-酮(所谓的丙烯)溶液中组成的双电层电容器的电化学特性碳酸(PC)),4-氟-1,3-二氧杂-2--2-(所谓的氟代碳酸亚乙酯(FEC)),以及各种命名溶剂的混合物,例如FEC:PC(1:1体积比),使用循环伏安法和电化学阻抗谱法研究了FECPC(1:9)和FECPC(1:19)。已经确定了比电容,相角和串联电阻值,取决于所使用的溶剂系统和所施加的温度(-45℃至90℃)。对于TiC-CDC电极,在所有电解液中以及在研究的温度下(T≥90℃时除外),均已证明其理想极化率ΔE≥3.0V。已获得比电导率和粘度值,并与电化学数据相关。极限电容,特征时间常数和复数功率值明显取决于用于制备电解质的溶剂,即取决于所用电解质溶液的粘度和比电导率。

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    Institute of Chemistry, University of Tartu, 14a Ravila Street, 50411 Tartu, Estonia;

    Institute of Chemistry, University of Tartu, 14a Ravila Street, 50411 Tartu, Estonia;

    Institute of Chemistry, University of Tartu, 14a Ravila Street, 50411 Tartu, Estonia;

    Institute of Chemistry, University of Tartu, 14a Ravila Street, 50411 Tartu, Estonia;

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